Fostering understanding, awareness, and appreciation of the Polar Regions through outreach, education, and research. Penn State University.

Publications

Evan Pugh Professor of Geosciences
Department of Geosciences, University Park

rba6@psu.edu
glaciology, paleoclimatology, climate change, glacial geology.

Christianson, K., B.R. Parizek, R.B. Alley, H.J. Horgan, R.W. Jacobel, S. Anandakrishnan, B.A. Keisling, B.D. Craig and A. Muto. 2013. Ice sheet grounding zone stabilization due to till compaction.  Geophysical Research Letters 40(20), 5406-5411, doi: 10.1002/2013GL057447.

Horgan, H.J., R.B. Alley, K. Christianson, R.W. Jacobel, S. Anandakrishnan, A. Muto, L.H. Beem and M.R. Siegfried. 2013. Estuaries beneath ice sheets.  Geology 41(11), 1159-1162.

Horgan, H.J., K. Christianson, R.W. Jacobel, S. Anandakrishnan and R.B. Alley. 2013. Sediment deposition at the modern grounding zone of Whillans Ice Stream, West Antarctica.  Geophysical Research Letters 40(15), 3934-3939, doi:10.1002/grl.50712.

Joughin, I., S.B. Das, G.E. Flowers, M. Behn, R.B. Alley, M.A. King, B.E. Smith, J.L. Bamber, M.R. van den Broeke and J.H. van Angelen. 2013. Influence of ice-sheet geometry and supraglacial lakes on seasonal ice-flow variability, The Cryosphere 7, 1185-1192, doi:10.5194/tc-7-1185-2013.

Muto, A., K. Christianson, H.J. Horgan, S. Anandakrishnan and R.B. Alley. 2013. Bathymetry and geological structures beneath the Ross Ice Shelf at the mouth of Whillans Ice Stream, West Antarctica, modeled from ground-based gravity measurements. Journal of Geophysical Research-Solid Earth 118, 4535-4546.

Muto, A., S. Anandakrishnan and R.B. Alley. 2013. Subglacial bathymetry and sediment layer distribution beneath the Pine Island Glacier ice shelf, West Antarctica, modeled using aerogravity and autonomous underwater vehicle data, Annals of Glaciology 54(64), 27-32.

Parizek, B.R., K. Christianson, S. Anandakrishnan, R.B. Alley, R.T. Walker, R.A. Edwards, D.S. Wolfe, G.T. Bertini, S.K. Rinehart, R.A. Bindschadler, and S.M.J. Nowicki. 2013. Dynamic (In)stability of Thwaites Glacier, West Antarctica. Journal of Geophysical Research-Earth Surface 118, 1-18, doi:10.1002/jgrf.20044

WAIS Divide Project Members (R.B. Alley is one of 42 authors). 2013. Onset of deglacial warming in West Antarctica driven by local orbital forcing.  Nature 500, 440-446.

Walker, R.T., B.R. Parizek, R.B. Alley, S. Anandakrishnan, K.L. Riverman and K. Christianson.  2013.  Ice-shelf tidal flexure and subglacial pressure variations.  Earth and Planetary Science Letters 361, 422-428.

Walker, R.T., D.M. Holland, B.R. Parizek, R.B. Alley, S.M.J. Nowicki and A. Jenkins. 2013. Efficient flowline simulations of ice shelf-ocean interactions: Sensitivity studies with a fully coupled model.  Journal of Physical Oceanography 43, 2200-2210.

Winberry, J.P., S. Anandakrishnan, D.A. Wiens and R.B. Alley. 2013. Nucleation and seismic tremor associated with the glacial earthquakes of Whillans Ice Stream, Antarctica. Geophysical Research Letters 40, 1-4, doi:10.1002/GRL.50130, 2013.

Zoet, L.K., R.B. Alley, S. Anandakrishnan and K. Christianson. 2013. Accelerated subglacial erosion in response to stick-slip motion.  Geology 41(2), 159-162.

Zoet, L.K., B. Carpenter, M. Scuderi, R.B. Alley, S. Anandakrishnan, C. Marone and M. Jackson. 2013. The effects of entrained debris on the basal sliding stability of a glacier.  Journal of Geophysical Research 118, 656-666.

Applegate, P.J., B.R. Parizek, R.E. Nicholas, R.B. Alley and K. Keller. 2014. Increasing temperature forcing reduces the Greenland Ice Sheet’s response time scale. Climate Dynamics, DOI 10.1007/s00382-014-2451-7, 11 pp.

Christianson, K., L.E. Peters, R.B. Alley, S. Anandakrishnan, R.W. Jacobel, K.L. Riverman, A. Muto and B.A. Keisling. 2014. Dilatant till facilitates ice-stream flow in northeast Greenland.  Earth and Planetary Science Letters 401, 57-69.

Fitzpatrick, J.J., D.E. Voigt, J.M. Fegyveresi, N.T. Stevens, M.K. Spencer, J. Cole-Dai, R.B. Alley, G. Jardine, E. Cravens, L. Wilen, T.J. Fudge and J. McConnell. 2014. Physical properties of the WAIS Divide ice core. Journal of Glaciology 60(224), 1181-1198.

Holschuh, N., D. Pollard, R.B. Alley and S. Anandakrishnan. 2014. Evaluating Marie Byrd Land stability using an improved basal topography. Earth and Planetary Science Letters 408, 362-369.

Keisling, B.A., K. Christianson, R.B. Alley, L.E. Peters, J.E.M. Christian, S.  Anandakrishnan, K.L.  Riverman, A. Muto and R.W. Jacobel. 2014. Basal conditions and ice dynamics inferred from radar-derived internal stratigraphy of the Northeast Greenland Ice Stream.  Annals of Glaciology 55(67), 127-137, doi:10.3189/2014AoG67A090.

Pratt, M.J., J.P. Winberry, D.A. Wiens, S. Anandakrishnan and R.B. Alley. 2014. Seismic and geodetic evidence for grounding-line control of Whillans Ice Stream stick-slip events. Journal of Geophysical Research—Earth Surface 119(2), 333-348, doi:10.1002/2013JF002842. 

Vallelonga, P., K. Christianson, R.B. Alley, S. Anandakrishnan, J.E.M. Christian, D. Dahl-Jensen, V. Gkinis, C. Holme, R.W. Jacobel, N.B. Karlsson, B.A. Keisling, S. Kipfstuhl, H.A. Kjaer, M.E.L. Kristensen, A. Muto, L.E. Peters, T. Popp, K.L. Riverman, A.M. Svensson, C. Tibuleac, B.M. Vinther, Y. Weng and M. Winstrup. . Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS). The Cryosphere 8, 1275-1287, doi:10.5194/tc-8-1275-2014.

Walker, R.T., B.R. Parizek, R.B. Alley, K.M. Brunt and S. Anandakrishnan. 2014.  Ice shelf flexure and tidal forcing of Bindschadler Ice Stream, West Antarctica. Earth and Planetary Science Letters 395, 184-193.

Winberry, J.P., S. Anandakrishnan, R.B. Alley, D.A. Wiens and M.J. Pratt. 2014. Tidal Pacing, Skipped Slips, and the Slow-down of the Whillans Ice Stream, Antarctica. Journal of Glaciology 60(222), 795-807, doi: 10.3189/2014JoG14J038.

Alley, R.B., S. Anandakrishnan, K. Christianson, H.J. Horgan, A. Muto, B.R. Parizek, D. Pollard and R.T. Walker. 2015. Oceanic forcing of ice-sheet retreat: West Antarctica and more.  Annual Reviews of Earth and Planetary Sciences 43, 207–231. 

Christianson, K., J. Kohler, R.B. Alley, C. Nuth, and W.J.J. van Pelt. 2015. Dynamic perennial firn aquifer on an Arctic glacier. Geophysical Research Letters 42, 1418-1426, doi:10.1002/2014GL062806.

Mitchell, L.E., C. Buizert, E.J. Brook, D.J. Breton, J. Fegyveresi, B. Baggenstos, A. Orsi, J. Severinghaus, R.B. Alley, M. Albert, R.H. Rhodes, J.R. McConnell, M. Sigl, O. Maselli, S. Gregory, J. Ahn. Observing and modeling the influence of layering on bubble trapping in polar firn. Journal of Geophysical Research – Atmospheres 120(6), 2558-2574, doi:10.1002/2014JD022766

Orsi, A., K. Kawamura, J.M. Fegyveresi, M.A. Headly, R.B. Alley and J.P. Severinghaus, Differentiating bubble-free layers from melt layers in ice cores using noble gases.  Journal of Glaciology 61(227), 585-594.

Pollard, D., R.M. DeConto and R.B. Alley. 2015. Potential Antarctic Ice Sheet retreat driven by hydrofracturing and ice cliff failure. Earth and Planetary Science Letters 412, 112-121, http://dx.doi.org/10.1016/j.epsl.2014.12.035.

WAIS Divide Project Members (R.B. Alley is one of 78 coauthors). 2015. Precise interpolar phasing of abrupt climate change during the last ice age. Nature 520, 661-665, doi:10.1038/nature14401.


sridhar-anandakrishnan
Sridhar Anandakrishnan, Ph.D.

Assistant Professor of Microbiology
Division of Mathematics and Natural Sciences, Altoona College
cub21@psu.edu
microbial ecology and physiology, permafrost, cold-adaptation of bacteria, genomics.

Bakermans, C. (Editor). 2015. Microbial Evolution under Extreme Conditions. Vol 2 in the series Life in Extreme Environments. D. Wagner (ed.),Walter de Gruyter GmbH, Berlin, Germany.

Alawi, M., N. Shapiro, T. Woyke, F. Horn, C Bakermans and D. Wagner. 2015. Genome sequence of Methanosarcina soligelidi strain SMA-21, isolated from Siberian permafrost-affected soil. Genome Announcements 3:e00270-15; doi:10.1128/genomeA.00270-15.

Goordial, J., I. Raymond-Bouchard, J. Ronholm, N. Shapiro, T. Woyke, L. Whyte, C. Bakermans. 2015. Improved-high-quality draft genome sequence of Rhodococcus sp. JG-3, a eurypsychrophilic Actinobacteria from Antarctic Dry Valley permafrost. Standards in Genomic Sciences 10:61. doi:10.1186/s40793-015-0043-8.

Rummel JD, Beaty DW, Jones MA, Bakermans C, et al. 2014. A New Analysis of Mars “Special Regions”: Findings of the Second MEPAG Special Regions Science Analysis Group (SR-SAG2). Astrobiology 14: 887-968.

Bakermans, C., M. L. Skidmore, S. Douglas and C. P. McKay. 2014. Molecular characterization of bacteria from permafrost of the Taylor Valley, Antarctica. FEMS Microbiology Ecology (Special Issue on Polar and Alpine Microbiology). 89(2):331-346.

Hinsa-Leasure, S. and C. Bakermans. 2013 Diversity of bacteria in permafrost. In Cold-Adapted Microorganisms. I. Yumoto (ed.) Caister Academic Press.


Associate Professor, Music Technology
School of Music/School of Theatre

ballora@psu.edu
sonification, computer music, music technology, audio, synthesis

Mark Ballora. “Two examples of sonification for viewer engagement: Hurricanes and squirrel hibernation cycles.” Extended abstract, Proceedings of The 20th International Conference of Auditory Display (ICAD 2015), Graz, Austria. 

Mark Ballora. “Sonification Strategies for the film Rhythms of the Universe.” Lecture presentation, The 20th International Conference of Auditory Display (ICAD 2014), June 22-25, New York, NY, USA.

Matthew Kenney, Mark Ballora, Susan Brantley. “Isotopic Data Sonification: Shale Hills Critical Zone Observatory.” Poster presentation, The 20th International Conference of Auditory Display (ICAD 2014), June 22-25, New York, NY, USA.

Jeff Rimland, Mark Ballora. “Using Vocal-Based Sounds to Represent Sentiment in Complex Event Processing.” Poster presentation, The 20th International Conference of Auditory Display (ICAD 2014), June 22-25, New York, NY, USA.

Jeffrey C. Rimland, Mark Ballora. “Using Complex Event Processing (CEP) and vocal synthesis techniques to improve comprehension of sonified human-centric data.” Proceedings of the Society for Photo-Optical Instrumentation Engineers (SPIE) v. 9122 Next-Generation Analyst II, 9122-2 (2014).

Mark Ballora (2014). Sonification, Science and Popular Music: In search of the ‘wow’ . Organised Sound, 19, pp 30-40 doi:10.1017/S1355771813000381 

Mark Ballora. “Seeing with Your Ears: Visualizing Data with Sound.” Presentation given at Gordon Research Conference on Visualization in Science and Education, Bryant University, RI, July 21, 2013. 

Jeffrey C. Rimland, Mark Ballora, David L. Hall. “Hard and Soft Information Fusion in Sonification for Assistive Mobile Device Technology.” Proceedings of the 19th International Conference on Auditory Display (ICAD 2013). July 6-10, 2013, Lodz, Poland. 

Jeffrey C. Rimland, Mark Ballora, Wade Shumaker. “Beyond visualization of big data: a multistage data exploration approach using visualization, sonification, and storification.” Proceedings of the Society for Photo-Optical Instrumentation Engineers (SPIE) v. 8758, Next-Generation Analyst: Information Systems and Networks: Processing, Fusion, and Knowledge Generation 2013, 8758-22.

Mark Ballora, George Smoot III. “Sound: The Music of the Universe.” Huffington Post TED Weekends. February 23, 2013.

Agnieszka Roginska, Mohanraj Hariharan, Mark Ballora, Kent Friedman. “Immersive sonification for displaying brain scan data.” HEALTHINF 2013, 6th International Conference on Biomedical Electronics and Devices, Barcelona, Spain, February 11-14, 2013.


Associate Professor Of English
hester.blum@psu.edu
oceanic studies, polar literature, history of polar exploration, expedition publications.

Blum, Hester. “Charles Francis Hall’s Arctic Researches,” The Sea and Nineteenth-Century Anglophone Literary Culture, eds. Steven Mentz and Martha Elena Rojas (Ashgate Publishing, forthcoming). 

Blum, Hester. Special Focus Issue Editor, “Oceanic Studies,” Atlantic Studies 10:2 (2013): 151-227.

Blum, Hester. “First Person Nautical: Poetry and Play at Sea,” co-authored with Jason Rudy, J19: The Journal of Nineteenth-Century Americanists 1:1 (Spring 2013): 189-194.

Blum, Hester. “Terraqueous Planet: The Case for Oceanic Studies,” The Planetary Turn: Art, Dialogue, and Geoaesthetics in the 21st-Century, eds. Amy J. Elias and Christian Moraru (Northwestern University Press, 2015): 25-36.

Blum, Hester. “The News at the End of the Earth: Polar Periodicals,” Unsettled States: Nineteenth-Century American Literary Studies, eds. Dana Luciano and Ivy Wilson (New York University Press, 2014): 158-88.

Blum, Hester. “Melville and Oceanic Studies,” The New Cambridge Companion to Herman Melville, ed. Robert S. Levine (Cambridge University Press, 2013): 22-36.

Blum, Hester. “My Chilly Ponies.” http://avidly.lareviewofbooks.org/2014/05/16/my-chilly-ponies/.

Blum, Hester. “Lonely Connect.” http://avidly.lareviewofbooks.org/2014/04/24/lonely-connect/.

Blum, Hester. Essays on Charles W. Morgan 38th Voyage: “Hardtack.” J19: The Journal of Nineteenth-Century Americanists 3:1 (2015): 2-6.

“A List of Books that I Did Not Read on the Voyage.” Leviathan 17:1 (2015): 129-132.

“The Lubber’s Hole,” http://www.psu.edu/feature/2015/04/01/sailing-stories (May, 2015).

“Moon Shot.” Common-Place 15 (Fall 2014). http://www.common-place.org/vol-15/no-01/roundtable/blum.shtml

“18 Hours Before the Mast.” Los Angeles Review of Books. August 3, 2014. http://lareviewofbooks.org/essay/18-hours-mast


Professor Emeritus, Microbiology and Biotechnology
Department of Biochemistry and Molecular Biology, University Park

jeb7@psu.edu
diversity and survival of microorganisms in cold environments.

Miteva V., Sowers T., Schüpbach S., Fischer H., Brenchley J. (2015) Geochemical and microbiological studies of nitrous oxide variations within the new NEEM Greenland ice core during the Last Glacial Period. Geomicrobiology Journal doi: 10.1080/01490451.2015.1074321.      

Miteva V, Rinehold K, Sowers T, Sebastian A, Brenchley J. (2015) Abundance, viability and diversity of the indigenous microbial populations at different depths of the NEEM Greenland ice core. Polar Res 34:25057.

Miteva V., Burlingame C., Sowers T., Brenchley J. (2014) Comparative evaluation of the indigenous microbial diversity versus drilling fluid contaminants in the NEEM Greenland ice core. FEMS Microbiol. Ecol. 89, 238-256 (DOI: 10.1111/1574-6941.12286).

Miteva V., Sowers T., Brenchley J. (2014) Penetration of fluorescent microspheres into the NEEM (North Eemian) Greenland ice core to assess the probability of microbial contamination. Polar Biology 37:47-59.


Karion, A., C. Sweeney, E. Kort, P. Shepson, A. Brewer, M. Cambaliza, S. Conley, K. Davis, M. Hardesty, S. Herndon, T. Lauvaux, T. Lavoie, D. Lyon, T. Newberger, G. Pétron, C. Rella, M. Smith, S. Wolter, T. Yacovitch and P. Tans, Estimate of methane emissions from the Barnett shale. In press, Environmental Science and Technology.

Shi, Yuning, Kenneth J. Davis, Fuqing Zhang, Christopher J. Duffy, and Xuan Yu, Parameter Estimation of a Physically-Based Land Surface Hydrologic Model Using the Ensemble Kalman Filter: A Multivariate Real-Data Experiment. In press, Advances in Water Resources.

Haszpra, L., Z. Barcza, T. Haszpra, Zs. Pátkai and K. J. Davis, How well do tall tower measurements characterize the CO2 mole fraction distribution in the planetary boundary layer? In press, Atmospheric Measurement Technology.

Brantley, S. L., R. DiBiase, T. Russo, Y. Shi, H. Lin, K. J. Davis, M. Kaye, L. Hill, J. Kaye, A. L. Neal, D. Eissenstat, B. Hoagland, and A. Dere, 2015, Designing a suite of measurements to understand the critical zone, Earth Surf. Dynam. Discuss., 3, 1–55, www.earth-surf-dynam-discuss.net/3/1/2015/doi:10.5194/esurfd-3-1-2015.

Ogle, S. M., K. Davis, T. Lauvaux, A. Schuh, D. Cooley, T. O. West, L. S. Heath, N. L. Miles, S. Richardson, F. J. Breidt, J. E. Smith, J. L McCarty, K. R. Gurney, P. Tans and A. S. Denning, 2015. An approach for verifying biogenic greenhouse gas emissions inventories with atmospheric CO2 concentration data, Environ. Res. Lett. 10 034012 doi:10.1088/1748-9326/10/3/034012

King, A. W., Andres, R. J., Davis, K. J., Hafer, M., Hayes, D. J., Huntzinger, D. N., de Jong, B., Kurz, W. A., McGuire, A. D., Vargas, R., Wei, Y., West, T. O., and Woodall, C. W., 2015. North America’s net terrestrial CO2 exchange with the atmosphere 1990–2009, Biogeosciences, 12, 399-414, doi:10.5194/bg-12-399-2015.

Refaat, Tamer F., Upendra N. Singh, Jirong Yu, Mulugeta Petros, Syed Ismail, Michael J. Kavaya and Kenneth J. Davis, 2015. Evaluation of an airborne triple-pulsed 2 m IPDA lidar for simultaneous and independent atmospheric water vapor and carbon dioxide measurements, Applied Optics, 54, 1387-1398, http://dx.doi.org/10.1364/AO.54.001387.

Cambaliza, M. O. L., P. B. Shepson, J. Bogner, D. R. Caulton, B. Stirm, C. Sweeney, S. A. Montzka, K. R. Gurney, K. Spokas, O. E. Salmon, T. N. Lavoie, A. Hendricks, K. Mays, J. Turnbull, B. R. Miller, T. Lauvaux, K. Davis, A. Karion, B. Moser, C. Miller, C. Obermeyer, J. Whetstone, K. Prasad, N. Miles and S. Richardson, 2015. Quantification and source apportionment of the methane emission flux from the city of Indianapolis, Elementa: Science of the Anthropocene, 3: 000037, doi:10.12952/journal.elementa.000037.

Turnbull, Jocelyn C., Colm Sweeney, Anna Karion, Timothy Newberger, Scott Lehman, Pieter P. Tans, Kenneth J. Davis, Thomas Lauvaux, Natasha L. Miles, Scott J. Richardson, Maria Obiminda Cambaliza, Paul B. Shepson, Kevin Gurney, Rita Patarasuk and Igor Razlivanov, 2015. Toward quantification and source sector identification of fossil fuel CO2 emissions from an urban area: Results from the INFLUX experiment. J. Geophys. Res. Atmos., 120, doi:10.1002/2014JG022555.

Cambaliza, M.O., P.B. Shepson, D. Caulton, B. Stirm, D. Samarov, K. Gurney, J. Turnbull, K.J. Davis, A. Possolo, A. Karion, C. Sweeney, B. Moser, A. Hendricks, T. Lauvaux, K. Mays, J. Whetstone, J. Huang, I. Razlivanov, N. Miles, and S.J. Richardson:  Assessment of uncertainties of an aircraft-based mass-balance approach for quantifying urban greenhouse gas emissions, 2014.  Atmos. Chem. Phys., 14, 9029 – 9050, www.atmos-chem-phys.net/14/9029/2014/doi:10.5194/acp-14-9029-2014.

Xiao, J., S. V. Ollinger, S. Frolking, G. C. Hurtt, D. Y. Hollinger, K. J. Davis, Y. Pan, X. Zhang, F. Deng, J. Chen, D. D. Baldocchi, B. E. Law, M. A. Arain, A. R. Desai, A. D. Richardson, G. Sun, B. Amiro, H. Margolis, L. Gu, R. L. Scott, P. D. Blanken, and A. E. Suyker. 2014. Data-driven diagnostics of terrestrial carbon dynamics over North America. Agricultural and Forest Meteorology 197:142-157.

Duffy, C., Shi, Y., Davis, K., Slingerland, R., Li, L., Sullivan, P. L., Godderis, Y., Brantley, S. L., 2014. Designing a Suite of Models to Explore Critical Zone Function. Procedia Earth and Planetary Science, 10, 7-15.

Díaz Isaac, Liza I., Thomas Lauvaux, Kenneth J. Davis, Natasha L. Miles, Scott J. Richardson, Andrew R. Jacobson, Arlyn E. Andrews, 2014. Model-data comparison of MCI field campaign atmospheric CO2 mole fractions. Journal of Geophysical Research – Atmospheres, 119, 10,536-10,551, doi:10.1002/2014JD021593.

Shi, Yuning, Kenneth J. Davis, Fuqing Zhang and Christopher J. Duffy, 2014. Evaluation of the parameter sensitivities of a coupled land surface hydrologic model. J. Hydrometeorology, 15, 279-299, DOI: 10.1175/JHM-D-12-0177.1

Belmecheri, Soumaya, R. Stockton Maxwell, Alan H. Taylor, Kenneth J. Davis, Katherine H. Freeman, William J. Munger, 2014. Tree-ring δ13C tracks flux tower ecosystem productivity estimates in a NE temperate forest. Environ. Res. Lett. 9 074011 doi:10.1088/1748-9326/9/7/074011.

Shi, Yuning, Kenneth J. Davis, Fuqing Zhang, Christopher J. Duffy, and Xuan Yu, 2014. Parameter estimation of a physically-based land surface hydrologic model using the ensemble Kalman Filter: A synthetic experiment. Water Resources Research, 50, 706—724. doi:10.1002/2013WR014070.

Lauvaux, T. and K.J. Davis, 2014. Planetary boundary layer errors in mesoscale inversions of column-integrated CO2 measurements. J. Geophysical Research Atmospheres, 119, 490-508, doi:10.1002/2013JD020175.

Xiao, J.F., Davis, K.J., Urban, N.M., Keller, K., 2014. Uncertainty in model parameters and regional carbon fluxes: A model-data fusion approach. Agricultural and Forest Meteorology, 189-190, 175-186.

Caulton, Dana R., Paul B. Shepson, Renee L. Santoro, Jed P. Sparks, Robert W. Howarth, Anthony Ingraffea, Maria O. Cambaliza, Colm Sweeney, Anna Karion, Kenneth J. Davis, Brian Stirm, Steve Montzka and Ben Miller, 2014. Toward a better understanding and quantification of methane emissions from shale gas development. Proceedings of the National Academy of Sciences, 111, 6237–6242, doi: 10.1073/pnas.1316546111

Hilton, T. W., Davis, K. J., and Keller, K., 2014. Evaluating terrestrial CO2 flux diagnoses and uncertainties from a simple land surface model and its residuals, Biogeosciences, 11, 217-235, doi:10.5194/bg-11-217-2014.

Reen, Brian P., David R. Stauffer and Kenneth J. Davis, 2014. Land-surface heterogeneity effects in the planetary boundary layer. Boundary-Layer Meteorology, 150, 1–31, DOI 10.1007/s10546-013-9860-8.

Published data sets:

Schuh, A.E., T. Lauvaux, S.M. Ogle, K.J. Davis, A.S. Denning, N.L. Miles, S.J. Richardson, and M. Uliasz. 2014. NACP MCI: CO2 Flux from Inversion Modeling, Upper Midwest Region, USA, 2007. Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, USA. http://dx.doi.org/10.3334/ORNLDAAC/1204

Professor of Woody Plant Physiology
Department of Ecosystem Science and Management, University Park

dme9@psu.edu
plant physiological ecology; root biology.
ecosystems.psu.edu/research/labs/root-ecology

Eissenstat DM, Kucharski JM, Zadworny M, Adams TS, Koide RT.  2015. Linking root traits to nutrient foraging in arbuscular mycorrhizal trees in a temperate forest. New Phytologist doi: 10.1111/nph.13451 (Full-article PDF)(The definitive version is available at http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1469-8137)

Liu B, Li H, Zhu B, Koide RT, Eissesntat DM, Guo D. 2015.  Complementarity in nutrient foraging strategies of absorptive fine roots and arbuscular mycorrhizal fungi across 14 coexisting subtropical tree species. New Phytologist (in press)

Herndon EM, Jin L, Andrews DM, Eissenstat DM, and Brantley SL. 2015. Impact of vegetation on manganese cycling in temperate forests. Global Biogeochemical Cycles 29: 160-174.

Adams TS, Eissenstat DM.  2015. On the controls of root lifespan:  assessing the role of soluble phenolics.  Plant and Soil (in press) (Full article-PDF)

McCormack MLIA Dickie, DM Eissenstat, TJ Fahey, CW Fernandez, D Guo, H-S Helmisaari, EA Hobbie, CM Iversen, RB Jackson, J Leppälammi-Kujansuu, RJ Norby, RP Phillips, KS Pregitzer, SG Pritchard, B Rewald, M Zadworny. 2015. Redefining fine roots improves understanding of belowground contributions to terrestrial biosphere processes. New Phytologist doi: 10.1111/nph.13363.

McCormack ML, Gaines KP, Pastore M, Eissenstat DM. 2015. Early season root production in relation to leaf production among six diverse tree species.  Plant and Soil 389: 121-129

McCormack ML, Crisfield E, Raczka B, Schnekenburger F, Eissenstat DM, Smithwick EAH. 2015. Sensitivity of four ecological models to adjustments in fine root turnover rate.Ecological Modelling 297:107-117

McCormack ML, Adams TS, Smithwick EAH, Eissenstat DM. 2014. Variability in root production, phenology and turnover rate among 12 temperate tree species. Ecology 95: 2224-2235 (full article-pdf)

Adams TS, Eissenstat DM. 2014. The continuous incorporation of carbon into existing Sassafras albidum roots and its implications for estimating root turnover.  PLOS ONE 9(5) e95321. doi:10.1371/journal.pone.0095321 (full article-website)

Adams TS, McCormack ML, Eissenstat DM. 2013. Foraging strategies in trees of different root morphology: the role of root lifespan. Tree Physiology 33: 940-948. (full article-pdf)

Mueller KE, Eissenstat DM, Müller CW, Oleksyn J, Reich PB and Freeman KH. 2013. What controls the concentration of various aliphatic lipids in soil? Soil Biology and Biochemistry 63: 14-17 (full article- pdf)

McCormack ML, DM Eissenstat, A Prasad, EAH Smithwick. 2013. Regional scale patterns of fine root lifespan and turnover under current and future climate. Global Change Biology 19:1697-1708. (full article-pdf)

Meinzer, F.C., Woodruff, D.R., Eissenstat D.M., Lin H.S., Adams, T.S., McCulloh, K.A. 2013. Above- and belowground controls on water use by trees of different wood types in an eastern United States deciduous forest. Tree Physiology 33: 345-356

Naithani, K. S., Baldwin, D.C., Gaines K.P., Lin, H., and Eissenstat, D. M., 2013. Spatial distribution of tree species governs the spatio-temporal interaction of leaf area index and soil moisture across a forested landscape.  PLoS ONE 8(3): e58704. doi:10.1371/journal.pone.0058704

Smithwick E.A.H., Eissenstat D.M., Lovett G.M., Bowden R.D., Rustad L.E. and C.T. Driscoll. 2013. Root stress and nitrogen deposition: consequences and research priorities.New Phytologist 197: 712-719. (full article-pdf)

Chen, W., Zeng, H., Eissenstat, D.M. and D Guo. 2013. Variation of first-order root traits across climatic gradients and evolutionary trends in geological time. Global Ecology and Biogeography 22: 846-856 (DOI: 10.1111/geb.12048)

Eissenstat, D.M., McCormack, M.L. and Q. Du. 2013. Global change and root lifespan. In: Eshel A., Beeckman T. (eds.).  Plant Roots: The Hidden Half (4 ed.). Taylor and Francis Group/CRC Press, Pp. 27-1 – 27-13 (email for copy)


Ph.D. Student, Geosciences
ndh147@psu.edu
glaciology, geophysics, polar science.

Holschuh, N., Pollard, D., Alley, R. B., & Anandakrishnan, S. (2014). Evaluating Marie Byrd Land stability using an improved basal topography. Earth and Planetary Science Letters, 408, 362–369. doi:10.1016/j.epsl.2014.10.034

Holschuh, N., Christianson, K., & Anandakrishnan, S. (2014). Power loss in dipping internal reflectors, imaged using ice-penetrating radar. Annals of Glaciology, 55(67), 49–56. doi:10.3189/2014AoG67A005


Ph.D. Student, NSF Graduate Research Fellow, Intercollege Graduate Degree Program (IGDP), Ecology
jkerby@psu.edu
population and community dynamics, spatial ecology, remote sensing, sea ice.

Venkataraman, V. Kerby, J., Fashing, P., Nguyen, N., Ashenafi, Z. (2015) Solitary wolves increase predation success upon rodents when among grazing monkey herds. Journal of Mammalogy, 96(1), 129-137.

Nguyen, N., Fashing, P., Boyd, D., Barry, T., Burke, R., Goodale, C. Jones, S., Kerby, J., Kellog, B., Lee, L., Miller, C., Nurmi, N., Ramsay, M., Venkataraman, V., Knauf, Y, Roos, C., Knauf, S. (2015) Fitness impacts of tapeworm parasitism on wild gelada monkeys at Guassa, Ethiopia.  American Journal of Primatology.

Fashing, P., Nguyen, N., Venkataraman, V., Kerby, J.(2014) Gelada feeding ecology in an intact ecosystem at Guassa, Ethiopia: variability over time and implcations for theropith and hominin dietary evolution.  American Journal of Physical Anthropology, 155(1), 1-16.

Kerby, J. & Post, E. (2013) Advancing plant phenology and reduced herbivore production in a terrestrial system associated with sea ice decline. Nature Communications, 4, 2514.

Post, E., Bhatt, U., Bitz, C., Brodie, J., Fulton, T., Hebblewhite, M., Kerby, J, Kutz, S., Stirling, I., Walker, D. (2013) Ecological consequences of sea-ice decline. Science, 341, 519-524. 

Kerby, J. & Post, E. (2013) Capital and income breeding traits differentiate trophic match-mismatch dynamics in large herbivores.  Philosophical Transactions of the Royal Society B., 386,1624.   

Kerby, J.  & Post, E. (2013). Reproductive phenology of large mammals.  In: Phenology: An Integrative Environmental Science.  Kluwer Academic Publishers, ed: Schwartz, M. D.


Distinguished Professor of Meteorology, Joint Appointment with the Department of Geosciences, Director of Earth System Science Center
Departments of Meteorology and Geosciences, University Park

mann@psu.edu
atmospheric business and policy, atmospheric dynamics, climate

Frankcombe, L.M., England, M.H., Mann, M.E., Steinman, B.A., Separating internal variability from the externally forced climate responseJ. Climate (in press).

Cowtan, K., Hausfather,Z., Hawkins, E., Jacobs, P., Mann, M.E., Miller, S.K., Steinman, B.A., Stolpe, M.B., Way, R.G., Robust comparison of climate models with observations using blended land air and ocean sea surface temperaturesGeophys. Res. Lett. 42, 6526–6534, doi:10.1002/2015GL064888, 2015.

Reed, A.J., Mann, M.E., Emanuel, K.A., Titley, D.W., An analysis of long-term relationships among count statistics and metrics of synthetic tropical cyclones downscaled from CMIP5 modelsJ. Geophys. Res. 120, 7506-7519, doi:10.1002/2015JD023357, 2015.

Oreskes, N., Carlat, D., Mann, M.E., Thacker, P.D., vom Saal, F.S., Why Disclosure MattersEnvironmental Science & Technology, 49, 7527-7528, 2015.

Halpern, M., Mann, M., Transparency Versus Harassment (editorial), Science, 479, 348, 2015.

Mann, M.E., Gleick, P.H., Climate Change and California Drought in the 21st CenturyProc. Nat. Acad. Sci., 112, 3858-3859, 2015.

Rahmstorf, S., Box, J., Feulner, G., Mann, M.E., Robinson, A., Rutherford, S., Schaffernicht, E. Evidence for an exceptional 20th-Century slowdown in Atlantic Ocean overturningNature Climate Change, 5, 475–480, 2015.

Ross, A.C., Najjar, R.G., Li, M., Mann, M.E., Ford, S.E., Katz, B., Influences on decadal-scale variations of salinity in a coastal plain estuaryEstuarine, Coastal and Shelf Science, 157, 79-92, 2015.

Steinman, B.A., Mann, M.E., Miller, S.K., Atlantic and Pacific multidecadal oscillations and Northern Hemisphere temperaturesScience, 347, 998-991, 2015.

Mann, M.E., The Serengeti strategy: How special interests try to intimidate scientists, and how best to fight backBulletin of the Atomic Scientists, 71, 33-45, 2015.

Paaijmans, K.P., Blanford, J.I., Crane, R.G., Mann, M.E., Ning, L., Schreiber, K.V., Thomas M.B.,Downscaling reveals diverse effects of anthropogenic climate warming on the potential for local environments to support malaria transmissionClimatic Change, 125, 479-488, 2014.

Rutherford, S., Mann, M.E., Missing tree rings and the AD 774-775 radiocarbon eventNature Climate Change, 4, 648-649, 2014.

Mann, M.E., Steinman, B.A., Miller, S.K., On Forced Temperature Changes, Internal Variability and the AMOGeophys. Res. Lett. (“Frontier” article), 41, 3211-3219, doi:10.1002/2014GL059233, 2014.

Singh, R., Wagener, T., Crane, R., Mann, M.E., Ning, L., A vulnerability driven approach to identify adverse climate and land use change combinations for critical hydrologic indicator thresholds – Application to a watershed in Pennsylvania, USAWat. Res. Res., 50, 3409-3427, doi:10.1002/2013WR014988, 2014.

Steinman, B.A., Abbott, M.B., Mann, M.E., Ortiz, J.D., Feng, S., Pompeani, D.P., Stansell, N.D., Anderson, L., Finney, B.P., Bird, B.W., Ocean-atmosphere forcing of centennial hydroclimate variability in the Pacific NorthwestGeophys. Res. Lett., 41, 2553-2560, doi:10.1002/2014GL059499, 2014.

Mann, M.E., False Hope: The rate of global temperature rise may have hit a plateau, but a climate crisis still looms in the near futureScientific American, p. 78-81, April 2014.

Schmidt, G.A., Annan, J.D., Bartlein, P.J., Cook, B.I., Guilyardi, E., Hargreaves, J.C., Harrison, S.P., Kageyama, M., LeGrande, A.N., Konecky, B., Lovejoy, S., Mann, M.E., Masson-Delmotte, V., Risi, C., Thompson, D., Timmermann, A., Tremblay, L.-B., Yiou, P., Using paleo-climate comparisons to constrain future projections in CMIP5Climate of the Past, 10, 221-250, 2014.

Sriver, R.L., Timmermann, A., Mann, M.E., Keller, K., Goosse, H., Improved representation of tropical Pacific ocean-atmosphere dynamics in an intermediate complexity climate modelJ. Climate, 27, 168-187, 2014.

Kozar, M.E., Mann, M.E., Emanuel, K.A., Evans, J.L., Long-term Variations of North Atlantic Tropical Cyclone Activity Downscaled from a Coupled Model Simulation of the Last MillenniumJ. Geophys. Res., 118, 13383-13392, doi:10.1002/2013JD020380, 2013.

Lewandowsky, S., Mann, M.E., Bauld, L., Hastings, G., Loftus, E.F., The Subterranean War on ScienceThe Observer (Association for Psychological Science), 26, 9, 2013.

Mann, M.E., Rutherford, S., Schurer, A., Tett, S.F.B.,Fuentes, J.D., Discrepancies between the modeled and proxy-reconstructed response to volcanic forcing over the past millennium: Implications and possible mechanismsJ. Geophys. Res. 118, 7617-7627, doi:10.1002/jgrd.50609, 2013.

Schurer, A., Hegerl, G., Mann, M.E., Tett, S.F.B., Separating forced from chaotic climate variability over the past millenniumJ. Climate, 26, 6954-6973, 2013.

Rutherford, S.D., Mann, M.E., Wahl, E., Ammann, C., Comment on: “Erroneous Model Field Representations in Multiple Pseudoproxy Studies: Corrections and Implications” by Jason E. Smerdon, Alexey Kaplan and Daniel E. AmrheinJ. Climate, 26, 3482-3484, 2013.

Emile-Geay, J., Cobb, K.M., Mann, M.E., Wittenberg, A.T., Estimating Central Equatorial Pacific SST variability over the Past Millennium. Part 2: Reconstructions and UncertaintiesJ. Climate, 26, 2329-2352, 2013.

Emile-Geay, J., Cobb, K.M., Mann, M.E., Wittenberg, A.T., Estimating Central Equatorial Pacific SST variability over the Past Millennium. Part 1: Methodology and ValidationJ. Climate, 26, 2302-2328, 2013.

Feng, S., Hu, Q., Wu, Q., Mann, M.E., A Gridded Reconstruction of Warm Season Precipitation for Asia Spanning the Past Half MillenniumJ. Climate, 26, 2192-2204, 2013

Blanford J.I., Blanford S., Crane R.G., Mann, M.E., Paaijmans K.P., Schreiber, K.V., Thomas, M.B.,Implications of temperature variation for malaria parasite development across AfricaNature Scientific Reports, 3, 1300, doi:10.1038/srep01300, 2013.


jennifer-miksis-olds
Jennifer L. Miksis-Olds, Ph.D.

Senior Research Associate (ARL), Associate Professor of Acoustics (Graduate Program of Acoustics) Department(s): Applied Research Lab, Graduate Program of Acoustics, Ecology, Wildlife & Fisheries
jlm91@psu.edu
bioacoustics, marine mammals, ecosystem dynamics.

Miksis-Olds, JL, Nichols, SM (accepted with revisions).  Is low frequency ocean sound increasing globally? Journal of the Acoustical Society of America.

Miksis-Olds, JL, Van Opzeeland, IC, Van Parijs, SM, Jones, J (in press).  Pinniped sounds in the polar oceans.  In Listening in the Ocean: New Discoveries and Insights on Marine Life from Autonomous Passive Acoustic Monitors (PAM).  In: Listening in the Ocean. W.L. Au and M.O. Lammers, eds.  Springer-Verlag.

Miksis-Olds, JL (in press).  Global trends in ocean noise.  In: Effects of Noise on Aquatic Life II. A.N. Popper and A. Hawkins eds., Springer Science + Business Media, LLC., New York.

Miksis-Olds, JL, Vernon, JA, Heaney, KD (in press).  The impact of ocean sound dynamics on estimates of signal detection range. Aquatic Mammals (Special ESOMM Edition) 41(4): 444-454.  DOI 10.1578/AM.41.4.2015.444

Stauffer, BA, Miksis-Olds, JL, Goes, JI (2015).  Cold regime interannual variability of community composition of primary and secondary producers in the southeastern Bering Sea.  PLoS ONE 10(6): e0131246. doi:10.1371/journal.pone.0131246

Miksis-Olds, JL, Madden LE (2014).  Environmental predictors of ice seal presence in the Bering Sea. PLoS ONE 9(9): e106998. doi:10.1371/journal.pone.0106998

Denes, SL, Miksis-Olds, JL, Mellinger, DK, Nystuen, JA (2014).  Assessing the cross platform performance of marine mammal indicators between two collocated acoustic recorders.  Ecological Informatics 21: 74-80.

Parks, SE, Miksis-Olds, JL, Denes, SL (2014).  Assessing marine ecosystem acoustic diversity across ocean basins.  Ecological Informatics 21: 81-88.

Hawkins, RS, Miksis-Olds, JL, Smith, CM (2014).  Variation in low-frequency estimates of sound levels based on different units of analysis.  Journal of the Acoustical Society of America 135: 705-711.

Miksis-Olds, JL, Bradley, DL, Niu, XM (2013).  Decadal trends in Indian Ocean ambient sound.  Journal of the Acoustical Society of America 134: 3464-3475.

Wang, JH, Hu, H, Goes, JI, Miksis-Olds, J, Mouw, CB, D’Sa, EJ, Gomes, HDR, Wand, D, Mizobata, K, Luo, L (2013). A modeling study of seasonal variations of sea ice and plankton in the Bering and Chukchi Seas during 2007-2008.  Journal of Geophysical Research. doi:10.1029/2012JC008322.

Miksis-Olds, JL, Stabeno, PJ, Napp, JM, Pinchuk, AI, Nystuen, JA, Warren, JD, Denes, SL (2013) Ecosystem response to a temporary sea ice retreat in the Bering Sea.  Progress in Oceanography 111: 38-51. doi: 10.1016/j.pocean.2012.10.010.


George-Milner
George Milner, Ph.D.

Professor and Department Head
Department of Anthropology, University Park
ost@psu.edu
human osteology, demographic structure of past populations, long-term trends in settlement patterns, human land use, warfare among small-scale societies


Senior Research Associate (Brenchley)
Department of Biochemistry and Molecular Biology, University Park

vim1@psu.edu

Miteva V., Sowers T., Schüpbach S., Fischer H., Brenchley J. (2015) Geochemical and microbiological studies of nitrous oxide variations within the new NEEM Greenland ice core during the Last Glacial Period. Geomicrobiology Journal doi: 10.1080/01490451.2015.1074321.      

Miteva V, Rinehold K, Sowers T, Sebastian A, Brenchley J. (2015) Abundance, viability and diversity of the indigenous microbial populations at different depths of the NEEM Greenland ice core. Polar Res 34:25057.

Miteva V., Burlingame C., Sowers T., Brenchley J. (2014) Comparative evaluation of the indigenous microbial diversity versus drilling fluid contaminants in the NEEM Greenland ice core. FEMS Microbiol. Ecol. 89, 238-256 (DOI: 10.1111/1574-6941.12286).

Miteva V., Sowers T., Brenchley J. (2014) Penetration of fluorescent microspheres into the NEEM (North Eemian) Greenland ice core to assess the probability of microbial contamination. Polar Biology 37:47-59.


Assistant Professor of Mathematics and Geosciences
Department of Earth Sciences, Penn State DuBois

parizek@psu.edu
glaciology, Earth-system processes pertaining to cryospheric dynamics, numerical modeling.

Alley, R.B., S. Anandakrishnan, K. Christianson, H.J. Horgan, A. Muto, B.R. Parizek, D. Pollard, and R.T. Walker. Oceanic forcing of ice-sheet retreat: West Antarctica and more. Annu. Rev. Earth Planet. Sci., 43: 207–31, doi: 10.1146/annurev-earth-060614-105344, 2015.

Applegate, P.J., B.R. Parizek, R.E. Nicholas, R.B. Alley, and K. Keller.  Increasing temperature forcing reduces the Greenland Ice Sheet’s response time scale. Climate Dynamics, Online: doi:10.1007/s00382-014-2451-7, 2014.

Walker, R.T., B.R. Parizek, R.B. Alley, K.M. Brunt, and S. Anandakrishnan.  Ice-shelf flexure and tidal forcing of Bindschadler Ice Stream, West Antarctica. Earth and Planetary Science Letters, v.395, 184-193, doi:10.1016/j.epsl.2014.03.049, 2014.

Walker, R.T., D.M. Holland, B.R. Parizek, R.B. Alley, S.M.J. Nowicki, and A. Jenkins.  Efficient flowline simulations of ice shelf-ocean interactions: Sensitivity studies with a fully coupled model. Journal of Physical Oceanography, v. 43, 2200-2210, doi:10.1175/JPO-D-13-037.1,2013.

Christianson K., B.R. Parizek, R.B. Alley, H.J. Horgan, R.W. Jacobel, S. Anandakrishnan, B.A. Keisling, B.D. Craig, and A. Muto. Ice sheet grounding zone stabilization due to till compaction. Geophys. Res. Lett., v. 40, 1–6, doi:10.1002/2013GL057447, 2013.

Nowicki, S.M.J., R.A. Bindschadler, A. Abe-Ouchi, A. Aschwanden, E. Bueler, H. Choi, J. Fastook, G. Granzow, R. Greve, G. Gutowski, U. Herzfeld, C. Jackson, J. Johnson, C. Khroulev, E. Larour, A. Levermann, W.H. Lipscomb, M.A. Martin, M. Morlighem, B.R. Parizek, D. Pollard, S.F. Price, D. Ren, E. Rignot, F. Saito, T. Sato, H. Seddik, H. Seroussi, K. Takahashi, R. Walker, and W.L. Wang. Insights into spatial sensitivities of ice mass response to environmental change from the SeaRISE ice sheet modeling project I: Antarctica.  Journal of Geophysical Research-Earth Surface, v. 118, doi:10.1002/jgrf.20081, 2013.

Nowicki, S.M.J., R.A. Bindschadler, A. Abe-Ouchi, A. Aschwanden, E. Bueler, H. Choi, J. Fastook, G. Granzow, R. Greve, G. Gutowski, U. Herzfeld, C. Jackson, J. Johnson, C. Khroulev, E. Larour, A. Levermann, W.H. Lipscomb, M.A. Martin, M. Morlighem, B.R. Parizek, D. Pollard, S.F. Price, D. Ren, E. Rignot, F. Saito, T. Sato, H. Seddik, H. Seroussi, K. Takahashi, R. Walker, and W.L. Wang.  Insights into spatial sensitivities of ice mass response to environmental change from the SeaRISE ice sheet modeling project II: Greenland.  Journal of Geophysical Research-Earth Surface, v. 118, doi:10.1002/jgrf.20076, 2013.

Lampkin, D.J., N. Amador, B.R. Parizek, K. Farness, and K. Jezek.  Drainage from water-filled crevasses along the margins of Jakobshavn Isbrae: A potential catalyst for catchment expansion. Journal of Geophysical Research-Earth surface, v. 118, doi:10.1002/jgrf.20039, 2013.

Parizek, B.R., K. Christianson, S. Anandakrishnan, R.B. Alley, R.T. Walker, R.A. Edwards, D.S. Wolfe, G.T. Bertini, S.K. Rinehart, R.A. Bindschadler, and S.M.J. Nowicki.  Dynamic (in)stability of Thwaites Glacier, West Antarctica. Journal of Geophysical Research-Earth Surface, v. 118, doi:10.1002/jgrf.20044, 2013.

Bindschadler, R.A.,S.M.J. Nowicki, A. Abe-Ouchi, A. Aschwanden, H. Choi, J. Fastook, G. Granzow, R. Greve, G. Gutowski, U. Herzfeld, C. Jackson, J. Johnson, C. Khroulev, A. Levermann, W.H. Lipscomb, M.A. Martin, M. Morlighem, B.R. Parizek, D. Pollard, S.F. Price, D. Ren, F. Saito, T. Sato, H. Seddik, H. Seroussi, K. Takahashi, R.T. Walker, and W.L. Wang. Ice-sheet model sensitivities to environmental forcing and their use in projecting future sea-level (The SeaRISE Project). Journal of Glaciology, 59(214), 195-224, doi:10.3189/2013JoG12J125, 2013.

Walker, R.T., B.R. Parizek, R.B. Alley, S. Anandakrishnan, K.L. Riverman, and K. Christianson.  Ice-shelf tidal flexure and subglacial pressure variations. Earth and Planetary Science Letters, v. 361, 422-428, doi:10.1016/j.epsl.2012.11.008, 2013.


Senior Scientist
Earth and Environmental Systems Institute, University Park

pollard@essc.psu.edu
paleoclimate, ice sheets, modeling.

Alley, R.B., S. Anandakrishnan. K. Christianson, H.J. Horgan, A. Muto, B.R. Parizek, D. Pollard and R.T. Walker. 2015. Oceanic forcing of ice-sheet retreat: West Antarctica and more. Ann. Rev. Earth Plan. Sci., 43, 7.1-7.25. 

Austermann, J., D. Pollard, J.X. Mitrovica, R. Moucha, A.M. Forte, R.M. DeConto, D.B. Rowley and M.E. Raymo. 2015. The impact of dynamic topography change on Antarctic Ice Sheet stability during the Mid-Pliocene Warm Period. Geology, 43, 927-930. 

Gasson, E., R. DeConto and D. Pollard. 2015. Antarctic bedrock topography uncertainty and ice sheet stability. Geophys. Res. Lett., 42, 5372-5377. 

Pollard, D., R.M. DeConto and R.B. Alley. 2015. Potential Antarctic Ice Sheet retreat driven by hydrofracturing and ice cliff failure. Earth Plan. Sci. Lett., 412, 112-121. 

Tabor, C.R., C.J. Poulsen and D. Pollard. 2015. How obliquity cycles powered early Pleistocene global ice-volume variability. Geophys. Res. Lett., 42, doi:10.1002/2015GL063322.

Briggs, R.D., D. Pollard, and L. Tarasov. 2014. A data-constrained large-ensemble analysis of Antarctic evolution since the Eemian. Quat. Sci. Rev., 103, 91-115. 

Docquier, D., D. Pollard and F. Pattyn. 2014. Thwaites Glacier grounding-line retreat: Influence of width and buttressing parameterizations. J. Glaciol., 60, 305-313. 

Holschuh, N., D. Pollard, S. Anandakrishnan and R. Alley. 2014. Evaluating Marie Byrd Land stability using an improved basal topography. Earth Plan. Sci. Lett., 408, 362-369. 

Koenig, S.J., R.M. DeConto and D. Pollard. 2014. Impact of reduced Arctic sea ice on Greenland ice sheet variability in a warmer than present climate. Geophys. Res. Lett., 41, 3933-3942. 

Tabor, C.R., C.J. Poulsen and D. Pollard. 2014. Mending Milankovitch’s theory: obliquity amplification by surface feedbacks. Clim. Past, 10, 41-50.

Briggs, R.D., D. Pollard and L. Tarasov. 2013. A glacial systems model configured for large ensemble analysis of Antarctic deglaciation. The Cryo., 7, 1949-1970. 

Gomez, N., D. Pollard and J.X. Mitrovica. 2013. A 3-D coupled ice sheet-sea level model applied to Antarctica through the last 40 ky. Earth Plan. Sci. Lett., 384, 88-99. 

Pollard, D., L.R. Kump and J.C. Zachos. 2013. Interactions between carbon dioxide, climate, weathering, and the Antarctic ice sheet in the earliest Oligocene. Glob. Plan. Change, 111, 258-267. 

Wilson, D.S., D. Pollard, R.M. DeConto, S.S.R. Jamieson and B.P. Luyendyk. 2013. Initiation of the West Antarctic Ice Sheet and estimates of total Antarctic ice volume in the earliest Oligocene. Geophys. Res. Lett., 40, 4305-4309.


Director of the Polar Center
Professor of Biology
Department of Biology, University Park
esp10@psu.edu
ecology of climate change in the Arctic.

Seebacher, F. & Post, E.  2015.  Climate change impacts on animal migration.  Climate Change Responses, 2:5.

Post, E. & Brodie, J.F.  2015.  Anticipating novel conservation risks of increased human access to remote regions with warming.  Climate Change Responses, 2:2.

Post, E. & Seebacher, F.  2014.  Addressing new challenges in climate change research by highlighting biological complexity.  Climate Change Responses, 1:5.

Brodie, J.F., Post, E., Berger, J., & Watson, F.  2014.  Trophic interactions and dynamic herbivore responses to snowpack.  Climate Change Responses, 1:4.

Bhatt, U.S., Walker, D.A., Walsh, J., Carmack, E., Frey, K.E., Meier, W., Moore, S., Parmentier, F.-J.W., Post, E., Romanovsky, V., & Simpson, W.  2014.  Implications of arctic sea ice decline for the earth system.  Ann. Rev. Environ. Resour., 39:57-89.

Post, E.  2013.  Tropical diversity countdown.  Nature, 502:174-175.

Post, E., Bhatt, U., Bitz, C., Brodie, J., Fulton, T., Hebblewhite, M., Kerby, J.T., Kutz, S., Stirling, I., & Walker, D.A.  2013.  Ecological consequences of sea ice decline.  Science, 341:519-524.

Post, E.  2013.  Erosion of community diversity and stability by herbivore removal under warming.  Proc. Roy. Soc. Lond. Ser. B., 208: 20122722.

Post, E. & Høye, T.T.  2013.  Advancing the long view of ecological change in tundra systems.  Phil. Trans. Roy. Soc. Lond. B, 368:  20120477.

Ahrestani, F., Hebblewhite, M., & Post, E.  2013.  The importance of observation vs. process error in analyses of global ungulate populations.  Scientific Reports 3:  3125.

Avery, M. & Post, E.  2013.  Record of a Zoophthora sp. (Entomophthoromycota: Entomophthorales) pathogen of the irruptive noctuid moth Eurois occulta (Lepidoptera) in West Greenland.  J. Inv. Path., 114:292-294.

Kerby, J.T. & Post, E.  2013.  Capital and income breeding traits differentiate trophic match-mismatch dynamics in large herbivores.  Phil. Trans. Roy. Soc. Lond. B, 368:  20120484.

Høye, T.T., Post, E., Schmidt, N.M., Trøjelsgaard, K., & Forchhammer, M.C.  2013.  Shorter flowering seasons and declining abundance of flower visitors in a warmer Arctic.  Nature Climate Change, doi:10.1038/nclimate1909.

Kerby, J.T. & Post, E.  2013.  Advancing plant phenology and reduced herbivore production in a terrestrial system associated with sea ice decline.  Nature Communications, doi:10.1038/ncomms3514.

Kerby, J., Wilmers, C.C., & Post, E.  2013.  Climate change, phenology, and the nature of consumer-resource interactions:  advancing the match/mismatch hypothesis.  Pp. 508-525 In Ohgushi, T., Schmitz, O.J., & Holt, R., eds.  Trait-Mediated Indirect Interactions:  Ecological and Evolutionary Perspectives.  Cambridge University Press.

Post, E.  2013.  Ecology of climate change – the importance of biotic interactions.  Princeton Univ. Press.


Ph.D. Student, Geosciences
klw367@psu.edu
subglacial hydrology, NE Greenland Ice stream.

Keisling, B. A., Christianson, K., Peters, L. E., Alley, R. B., Christian, J. E. M., Anandakrishnan, S.,Riverman, K. L., Muto, A., Jacobel, R. W. 2014. Basal conditions and ice dynamics inferred from radar-derived internal stratigraphy of the Northeast Greenland Ice Stream.  Annals of Glaciology. V 55, n 67.

Christianson, K., Alley, R., Anandakrishnan, S., Peters, L., Jacobel, R., Riverman, K., Muto, A. 2014. Dilatant till facilitates ice-stream flow in northeast Greenland. Earth and Planetary Science Letters, V 401

Valelonga, P., Christianson, K., Alley, R. B., Anandakrishnan, S., Christian, J. E. M., Dahl-Jensen, D., Gkinis, V., Holme, C., Jacobel, R., Karlsson, N., Keisling, B. A., Kipfstuhl, S., Kjaer, H. A., Kristensen, M. E., Muto, A., Peters, L., Popp, T., Riverman, K., Svensson, A. M., Tibuleac, C., Vinther, B. M., Weng, Y., Winstrup, M. 2014. Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS). The CryosphereV 8.

Stanton, T., Shaw, W., Truffer, M., Corr, H., Peters, L., Riverman, K., Bindschadler, R., Holland, D., Anandakrishnan, S. 2013. Channelized ice melting in the ocean boundary layer beneath Pine Island Glacier, Antarctica. Science. V 341, 6151.


Michael Sheriff, Assistant Professor of Mammalogy and Ecology,
Department of Ecosystem Science and Management

mjs72@psu.edu
physiological ecology, stress, mammals

Sheriff MJ, Buck CL, Barnes BM (2015) Autumn conditions as a driver of spring phenology in a free-living arctic mammal. Climate Change Responses 2: 4 doi. 10.1186/s40665-015-0012-x. pdf

Werner JR, Krebs CJ, Donker SA, Boonstra R, Sheriff MJ (2015) Arctic ground squirrel population collapse in the boreal forests of the Southern Yukon. Wildlife Research doi. org/10/1071/WR14240. pdf

Sheriff MJ, McMahon EK*, Krebs CJ, Boonstra R (2015) Predator-induced maternal stress and population demography in snowshoe hares: The more severe the risk, the longer the generational effect. Journal of Zoology doi: 10.1111/jzo.12249. pdf
*undergraduate researcher

Dantzer B, Fletcher QE, Boonstra R, Sheriff MJ (2014) Measures of physiological stress: a transparent or opaque window into the status, management and conservation of species? Conservation Physiology 2, doi: 10.1093/conphys/cou023. pdf

Boonstra R, Dantzer B, Delehanty B, Fletcher Q, Sheriff MJ (2014) Equipped for life in the Boreal Forest: the role of the stress axis in mammals. Arctic 67: 82-97. pdf
(Special Issue Invited Submission)

Sheriff MJ, Frindinger RW, Tøien Ø, Barnes BM, Buck CL (2013) Metabolically rate and pre hibernation fattening in free-living arctic ground squirrels. Physiological and Biochemical Zoology 86: 515-527. pdf

Sheriff MJ, Richter M, Buck CL, Barnes BM (2013) Changing seasonality and phenology of free-living arctic ground squirrels; the importance of sex. Philosophical Transactions of the Royal Society B 368: 20120480.
(Special Issue Invited Submission) pdf

Helm B, Ben-Shlomo R, Sheriff MJ, Hut R, Foster R Barnes BM, Dominoni D, (2013) Annual Rhythms that underlie phenology: biological time-keeping meets environmental change. Proceedings of the Royal Society B 280: 20130016.
(Special Issue Invited Submission) pdf

Professor of Practice
Director, Center for Solutions to Weather and Climate Risk
Department of Meteorology
dwt12@psu.edu
weather risk, climate & national security, climate communications, arctic policy.


Hans Verlinde, Ph.D.

Hanlon, C.J., J. B. Stefik, A.A. Small, J. Verlinde and G.S. Young, 2013: Statistical decision analysis for flight decision support: The SPartICus campaign. J. Geophys. Res., DOI: 10.1002/jgrd.50237.

Senior Research Assistant
Department of Geosciences, University Park
dev2@psu.edu
www.psice.psu.edu/people.htm

Voigt, D. E., L. E. Peters, S. Anandakrishnan (2013), “Georods”: The development of a four-element geophone for improved seismic imaging of glaciers and ice sheets, Annals of Glaciology, 54(64), pp 142-148.
WAIS Divide Project Members, (2013), Onset of deglacial warming in West Antarctica driven by  local orbital forcing, Nature, vol 500, 22 August, pp 440-443.
Voigt, D.E., J.J. Fitzpatrick, R.B. Alley, (2015), C-axis fabric from physical properties samples of the WAIS Divide Ice Core. Boulder, Colorado, National Snow and Ice Data Center, http://dx.doi.org/10.7265/N5W093VM
 
Fitzpatrick, J.J., D.E. Voigt, J.M. Fegyveresi, N.T. Stevens, M.K. Spencer, J. Cole-Dai, R.B. Alley, G.E. Jardine, E.D. Cravens, L.A. Wilen, T.J. Fudge, J.R. McConnell, (2014), Physical Properties of the WAIS Divide Ice Core, Journal of Glaciology, 60(244) pp 1181-1198.