background header Graduate Program of Hydrologic Sciences
background header Graduate Program of Hydrologic Sciences
background header Graduate Program of Hydrologic Sciences

Graduate Program of Hydrologic Sciences

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 science,   Ecohydrology,   Evapotranspiration,   GIS/spatial analysis,   Global change,   Ground water/surface water interactions,   Hydrology,   Remote sensing,   Snow,   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

Hammond, J.C., Harpold, A.A., Weiss, S., and Kampf, S.K. 2019, Partitioning snowmelt and rainfall in the critical zone: effects of climate type and soil properties, Hydrology and Earth Systems Sciences
Bloschl, G., and 229 co-authors including A.A. Harpold. 2019, Twenty-three unsolved problems in hydrology (UPH) – a community perspective., Hydrological Sciences Journal  
Kostadinov, T.S. R. Schumer, M. Hausner, K. J. Bormann, R. Gaffney, K. McGwire, T. H. Painter, S. Tyler, and A.A. Harpold 2019, Watershed-scale mapping of fractional snow cover under forest canopy using lidar, Remote Sensing of Environment  
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
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
Harpold, A.A. and P.D. Brooks 2018, Humidity Determines Snowpack Ablation Under a Warming Climate, Proceedings of the National Academy of Sciences
Petersky, R. and A.A. Harpold 2018, Now you see it, now you don't: a case study of ephemeral snowpacks and soil moisture response in the Great Basin, USA, Hydrology and Earth System Sciences
Petersky R,, Shoemaker K.T., Weisberg P.J., Harpold A. 2018, The sensitivity of snow ephemerality to warming climate across an arid to montane vegetation gradient, Ecohydrology
Kostadinov, T.S. R. Schumer, M. Hausner, K. J. Bormann, R. Gaffney, K. McGwire, T. H. Painter, S. Tyler, and A.A. Harpold. 2018, Watershed-scale mapping of fractional snow cover under conifer forest canopy using lidar, Remote Sensing of Environment
Harpold, A.A., M. Dettinger, and S. Rajagopal 2017, Defining Snow Drought and Why it Matters, EOS, 8
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
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
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
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
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
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
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
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
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
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.
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
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
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
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
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.
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
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
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
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
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
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
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.
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.
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
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
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
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.
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
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 Materials
Harpold, A.A. and T.S. White. 2013, Exploring the Critical Zone with LiDAR., American Geosciences Institute handout for K-12 teachers.
Harpold, A. , Chandra, S. and Houston, D. 2016, Global Warming, Lawyers, Guns & Money -
Photo of Adrian Harpold

Contact Info

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