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Adrian Harpold

Assistant Professor

Natural Resources and Environmental Science

Academic & Research Interest

My interests are in quantifying catchment and basin scale water and solute budgets and the linkages between hydrology, hydrochemistry, geomorphology, and ecology in montane forested systems. Moutain ecosystems are the major water source and carbon sink in western North America and subject to ongoing changes in climate and disturbance.  Improved ecohydrological process understanding has the potential to improve local to global-scale water resource management in the 21st century.

My research program utilizes existing observation networks and new field observations to improve the ecohydrological process underpinnings of Earth systems models.  My diverse interests and background has led to investigations of runoff generation mechanisms via hydrological tracers and models, as well as the partitioning of water to its various stores and fluxes.  I am particularly interested in better linking the hydrological sub-disciplines of catchment and snow hydrology to improve our predictions of headwater catchment response to environmental change.

B.S. Virginia Polytechnic Institute, 2003
M.S. Virginia Polytechnic Institute, 2005
Ph.D. Cornell University, 2010

Areas of Study

Climate change,   Ecohydrology,   Evapotranspiration,   GIS/spatial analysis,   Global change,   Ground water/surface water interactions,   Hydrology,   Remote sensing,   Surface water hydrology,   Water resource assessment/evaluation,   Watershed processes,  

Current Students:

Rosangela Carreon (PhD)
Patrick Longley (MS)
Rose Petersky (MS)
Jon Weiner (PhD)

Representative Publications

Perdrial, J., P. Brooks, T. Swetnam, K.A. Lohse, C. Rasmussen, M. Litvak, A.A. Harpold, X. Zapata-Rios, P. Broxton, B. Mitra, T. Meixner, K. Condon, D. Huckle, C. Stielstra, A.Vazquez-O, , M. Holleran, C. Orem, J. Pelletier, and C. Chorover. 2018, A net ecosystem carbon budget for snow dominated forested headwater catchments: linking water and carbon fluxes to critical zone carbon storage, Biogeochemistry   https://link.springer.com/article/10.1007%2Fs10533-018-0440-3
Karwan, D.L., J.E. Pizzuto, R. Aalto, J. Marquard, A. Harpold, K. Skalak, A. Benthaem, D.F. Levia, C.M. Siegert, and A. Aufdenkampe. 2018, Event-scale suspended sediment age influenced by hydrologic flux in a mixed-land use Mid-Atlantic Watershed, Water Resources Research   https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2017WR021684
Harpold, A.A. and P.D. Brooks 2018, Humidity Determines Snowpack Ablation Under a Warming Climate, Proceedings of the National Academy of Sciences   http://naes.agnt.unr.edu/PMS/Pubs/687_2018_41.pdf
Harpold, A.A., M. Dettinger, and S. Rajagopal 2017, Defining Snow Drought and Why it Matters, EOS, 8   http://naes.agnt.unr.edu/PMS/Pubs/687_2017_33.pdf
McIntosh, J. C, Schaumberg, C, Perdrial, J, Harpold, A., Vázquez-Ortega, A. and Rasmussen, C. Vinson, D, Zapata-Rios, X. and Brooks, P. D, Meixner, T., Pelletier, Jon, Derry, L., Chorover, J. 2017, Geochemical evolution of the Critical Zone across variable time scales informs concentration-discharge relationships: Jemez River Basin Critical Zone Observatory, Water Resources Research   http://onlinelibrary.wiley.com/doi/10.1002/2016WR019712/full
Wymore, A. S., West, N. R., Maher, K., Sullivan, P. L., Harpold, A., Karwan, D., Marshall, J. A., Perdrial, J., Rempe, D. M., and Ma, L. 2017, Growing new generations of critical zone scientists, Earth Surface Processes and Landforms   http://onlinelibrary.wiley.com/doi/10.1002/esp.4196/full
Harpold, A.A and M. Kohler 2017, Potential For Changing Extreme Snowmelt And Rainfall Events in the Mountains of the Western United States, Journal of Geophysical Research: Atmospheres   http://onlinelibrary.wiley.com/doi/10.1002/2017JD027704/abstract
Harpold, A.A., M. Kaplan, Z. Klos, T. Link, J. McNamara, R. Schumer, C. Steele, and S. Rajagopal 2017, Rain or Snow: Processes, Observations, Prediction, and Research Needs For Hydrologic Sciences., Hydrology and Earth System Sciences   http://naes.agnt.unr.edu/PMS/Pubs/687_2017_13.pdf
Tennant, C. J., Harpold, A. A., Lohse, K. A., Godsey, S. E., Crosby, B. T., Larsen, L. G., Brooks, P. D., Van Kirk, R. W. and Glenn, N. F. 2017, Regional sensitivities of seasonal snowpack to elevation, aspect, and vegetation cover in western North America., Water Resources Research   http://onlinelibrary.wiley.com/doi/10.1002/2016WR019374/full
Harpold, A.A., S. Rajagopal, J. Crews, T. Winchell, and R. Schumer. 2017, Relative humidity has uneven effects on shifts from snow to rain over the western U.S., Geophysical Research Letters   http://onlinelibrary.wiley.com/doi/10.1002/2017GL075046/full
Swetnam, T., Brooks, P., Barnard, H., Harpold, A., Gallo, E. 2017, Topographically-driven differences in energy and water constrain climatic control on forest carbon sequestration, Ecosphere   http://onlinelibrary.wiley.com/doi/10.1002/ecs2.1797/full
Harpold, A.A., K. Sutcliffe, J. Clayton, A. Goodbody, and S. Vazquez 2016, Can Soil Moisture Information Improve Operational Streamflow Forecasts In Snow-Dominated Watersheds?, Journal of American Water Resources Association   http://naes.agnt.unr.edu/PMS/Pubs/687_2016_12.pdf
Harpold, A.A. 2016, Diverging Sensitivity of Soil Water Stress To Changing Snowmelt Timing in the Western U.S., Advances in Water Resources. 92: 116-129. Doi: 10.1016/j.advwatres.2016.03.017   http://naes.agnt.unr.edu/PMS/Pubs/687_2016_05.pdf
Biederman, J. A., Meixner, T., Harpold, A. A., Reed, D. E., Gutmann, E. D., Gaun, J. A., & Brooks, P. D. 2016, Riparian zones attenuate nitrogen loss following bark beetle-induced lodgepole pine mortality., Journal of Geophysical Research: Biogeosciences.   http://naes.agnt.unr.edu/PMS/Pubs/687_2016_06.pdf
Barnhart, T. N.P. Molotch, B. Livneh, A.A. Harpold, J. Knowles and D. Schneider. 2016, Snowmelt Rate Dictates Streamflow, Geophysical Research Letters. doi: 10.1002/2016GL069690   http://naes.agnt.unr.edu/PMS/Pubs/687_2016_07.pdf
Rajagopal, S. and A.A. Harpold 2016, Testing and Improving Temperature Thresholds for Snow and Rain Prediction in the Western United States., Journal of the American Water Resources Association. DOI: 10.1111/1752-1688.12443   http://naes.agnt.unr.edu/PMS/Pubs/687_2016_08.pdf
Harpold, A. A., Marshall, J. A., Lyon, S. W., Barnhart*, T. B., Fisher, B. A., Donovan, M., Brubaker, K. M., Crosby, C. J., Glenn, N. F., Glennie, C. L., Kirchner, P. B., Lam, N., Mankoff, K. D., McCreight, J. L., Molotch, N. P., Musselman, K. N., Pelletier, J., Russo, T., Sangireddy, H., Sjöberg, Y., Swetnam, T., and West, N. 2015, Laser vision: lidar as a transformative tool to advance critical zone science, Hydrology and Earth Systems Science   http://naes.agnt.unr.edu/PMS/Pubs/687_2015_02.pdf
Broxton P. D., Harpold A. A., Biederman J. A., Troch P. A., Molotch N. P., and Brooks P. D. 2015, Quantifying the effects of vegetation structure on snow accumulation and ablation in mixed-conifer forests, Ecohydrology   http://onlinelibrary.wiley.com/doi/10.1002/eco.1565/abstract
Vázquez-Ortega, A., Perdrial, J., Harpold, A., Zapata-Ríos, X., Rasmussen, C., McIntosh, J., ... & Chorover, J. 2015, Rare Earth Elements as Reactive Tracers of Biogeochemical Weathering in Forested Rhyolitic Terrain., Chemical Geology.   http://www.sciencedirect.com/science/article/pii/S0009254114004562
Biederman, J.A., A. Somor, A.A. Harpold, E. Gutmann, D.D. Breshears, P.A. Troch, D.J. Gochis, R.L. Scott, A.J.H. Meddens, and P.D. Brooks. 2015, Recent tree die-off has little effect on streamflow in contrast to expected increases from historical studies, Water Resources Research   http://naes.agnt.unr.edu/PMS/Pubs/687_2015_04.pdf
Harpold, A.A. and N.P. Molotch 2015, Sensitivity of soil water availability to changing snowmelt timing in the western U.S., Geophysical Research Letters   http://naes.agnt.unr.edu/PMS/Pubs/687_2016_08.pdf
Harpold, A.A, N.P. Molotch, P.D. Brooks, R. Bales, M. Litvak, K. Musselman. And P. Kirchner. 2015, Snowmelt infiltration in mixed-conifer subalpine forests, Hydrological Processes   http://onlinelibrary.wiley.com/doi/10.1002/hyp.10400/abstract
Knowles, J.F., Harpold, A.A., Cowie, R., Zeliff, M., Barnard, H.R., Burns, S.P., Blanken, P.D., Morse, J.F., and Williams, M.W. 2015, The relative contributions of alpine and subalpine ecosystems to the water balance of a mountainous, headwater catchment., Hydrological Processes   http://naes.agnt.unr.edu/PMS/Pubs/687_2015_01.pdf
Harpold, A.A. 2015, Use of LiDAR in Environmental Science, Oxford Bibliographies in Environmental Science  
Harpold, A.A., Q. Guo, N. Molotch, P. Brooks, R. Bales, J.C. Fernandez-Diaz, K.N. Musselman, T. Swetnam, P. Kirchner, M. Meadows, J. Flannagan, and R. Lucas 2014, A LiDAR derived snowpack dataset from mixed conifer forests in the Western U.S., Water Resources Research   http://naes.agnt.unr.edu/PMS/Pubs/687_2016_08.pdf
Biederman, J.A., A.A. Harpold, D. Reed, D. Gochis, B. Ewers, E. Gutmann, and P.D. Brooks. 2014, Changes in water partitioning and runoff at the hillslope to catchment scale following insect-induced tree mortality in lodgepole pine forests., Water Resources Research   http://onlinelibrary.wiley.com/doi/10.1002/2013WR014994/abstract
Harpold, A.A., J. Biederman, K. Condon, M. Merino, Y. Korganokar, T. Nan, L.L. Sloat, M. Ross, and P.D. Brooks. 2014, Changes in winter season snowpack accumulation and ablation following the Las Conchas Forest Fire., Ecohydrology. 7: 440-452. doi: 10.1002/eco.1363.   http://naes.agnt.unr.edu/PMS/Pubs/687_2016_11.pdf
Perdrial, J. McIntosh, A.A. Harpold, P.D. Brooks, X. Zapata-Rios, J. Ray, T. Meixner, T. Kanduc, M. Litvak, P. Troch, and J. Chorover. 2014, Stream water carbon controls in seasonally snow-covered mountain catchments: impact of interannual variability of water fluxes, catchment aspect and seasonal processes., Biogeochemistry. doi:10.1007/s10533-013-9929-y  
Sorooshian, A.S., T.S. Shingler, A.A. Harpold, C.W. Feagles, T.M. Meixner, and P.D. Brooks. 2013, Aeresol and Precipitation Chemistry in the Southwestern United States: Spatiotemporal Trends and Interrelationships., Atmospheric Chemistry and Physics. 13: 7361-7379. doi:10.5194/acp-13-7361-2013  
Harpold, A.A., D.A. Burns, M.T. Walter, and T. Steenhuis 2013, Explaining the spatial variability of aquatic biota using watershed features in the Neversink River watershed, New York, USA, Ecological Applications. 23: 791-800. doi: 10.1890/12-0603.   http://www.esajournals.org/doi/abs/10.1890/12-0603.1
Harpold, A.A., D.A. Burns, M.T. Walter, and T. Steenhuis 2013, Explaining the spatial variability of aquatic biota using watershed features in the Neversink River watershed, New York, USA., Ecological Applications   http://www.esajournals.org/doi/abs/10.1890/12-0603.1
Harpold, A.A., P.D. Brooks, S. Rajogopalan, I. Heidebuchel, A. Jardine, and C. Stielstra 2012, Changes in snowpack volume and snowmelt timing in the Intermountain West., Water Resources Research. 48:11. doi: 10.1029/2012WR011949   http://onlinelibrary.wiley.com/doi/10.1029/2012WR011949
Biederman, J., P.D. Brooks, A.A. Harpold, D. Gochis, E. Gutman, D. Reed, E. Pendall, and B. Ewers. 2012, Multi-scale Observations of Snow Accumulation and Peak Snowpack Following Widespread, Insect-induced Lodgepole Pine Mortality, Ecohydrology   http://onlinelibrary.wiley.com/doi/10.1002/eco.1342/abstract
Perdrial, J., N. Perdrial, A.A. Harpold, X. Gao, K. LaSharr, J. Chorover 2012, Probing dissolved organic matter in the critical zone: a comparison between in situ passive capillary wick samplers (PCaps) to aqueous soil extracts, Soil Science Society of America Journal. 76(6): 2019-2030. doi:10.2136/sssaj2012.0061  
Chorover, J., P.A. Troch, C. Rasmussen, P.D. Brooks, J.D. Pelletier, D.D. Breshears, T.E. Huxman, S.A. Kurc, K.A. Lohse, J.C. McIntosh, T. Meixner, M.G. Schaap, M.E. Litvak, J. Perdrial, A.A. Harpold, M. Durcik. 2011, Probing how water, carbon, and energy driven landscape evolution and surface water dynamics: Jemez River Basin – Santa Catalina Mountains Critical Zone Observatory., Vadose Zone Journal. 10(3): 884-899. doi:10.2136/vzj2010.0132  
Harpold, A.A., S.B. Shaw, D.A. Burns, M.T. Walter, and T. Steenhuis. 2010, Relating hydrogeomorphologic properties to stream buffering chemistry in the Neversink River watershed, New York, USA, Hydrological Processes. 24(26): 3759-3771. doi:10.1002/hyp.7802  
Harpold, A.A., S.W. Lyon, P.A. Troch, and T.S. Steenhuis. 2009, The hydrological effects of lateral preferential flow paths in a glaciated watershed in the Northeastern U.S., Vadose Zone Journal. 9(2): 397-414. doi:10.2136/vzj2009.0107.   http://naes.agnt.unr.edu/PMS/Pubs/687_2016_09.pdf
Shaw, S. A.A. Harpold, J.A. Taylor, and M.T. Walter. 2007, Investigating a high-resolution, stream chloride time series from Biscuit Brook catchment, Catskills, NY., Journal of Hydrology. 348(3-4): 245-256. doi:10.1016/j.hydrol.2007.10.009   http://naes.agnt.unr.edu/PMS/Pubs/687_2016_10.pdf
News Letters
Harpold, A.A., J.A. Biederman, and P.D. Brooks. 2013, Where did all that snow go? Compensating vapor losses following forest disturbance in the Rocky Mountains., CIRMOUNT Mountain Views. 7(1).  
Curriculum Development
Harpold, A.A. and T.S. White. 2013, Exploring the Critical Zone with LiDAR., American Geosciences Institute handout for K-12 teachers.   http://criticalzone.org/national/publications
Harpold, A. , Chandra, S. and Houston, D. 2016, Global Warming, Lawyers, Guns & Money - YouTube.com   https://youtu.be/VLObSRU5zkg
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Contact Info

1664 N. Virginia Street
Reno,  Nevada   89557
Office: (775) 784-6759