Todd M. Scanlon

Todd M. Scanlon

Department of Environmental SciencesPhone: (434) 924-3382

University of VirginiaFax: (434) 924-4137

291 McCormick Rd., P.O. Box 400123, Clark HallEmail:

Charlottesville, VA 22904-4123, USA

EDUCATION

2002Ph.D., Environmental Sciences, University of Virginia

1999M.S., Environmental Sciences, University of Virginia

1995B.A., Earth Sciences (with High Honors), DartmouthCollege

PROFESSIONAL RECORD

2010-presentAssociate Professor, Dept. of Environmental Sciences, University of Virginia

2004-2010Assistant Professor, Dept. of Environmental Sciences, University of Virginia

2003-2004Research Associate, Princeton University

2002-2003Government of Ireland Post-Doctoral Fellow, University College, Cork, Ireland

1996-2002Graduate Student, Dept. of Environmental Sciences, University of Virginia

1995-1996Professional Internship Program, Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN

RESEARCH INTERESTS

Catchment hydrology; Land-atmosphere interaction; Nutrient cycling and transport; Applications of remote sensing to ecohydrological models.

HONORS and AWARDS

NSF CAREER Award (2007)

University of Virginia Teaching Fellow (2006-2007)

Maury Prize in Environmental Sciences (Highest Departmental Honor), Univ. Virginia (2002)

Outstanding Student Paper Award, American Geophysical Union Spring Meeting (2002)

Chamberlain Fellowship, University of Virginia (2001)

DuPont Fellowship, University of Virginia (2000)

Dean’s Reserve Fellowship, University of Virginia (1999)

Hydrology Award, Department of Environmental Sciences, University of Virginia (1998)

Upham Prize in Geology, Department of Earth Sciences, Dartmouth College (1995)

PROFESSIONAL SERVICE

Associate Editor, Water Resources Research (2009-present)

Peer Reviewer, Advances in Water Resources,Agricultural and Forest Meteorology, Atmospheric Environment, Boundary-Layer Meteorology,Ecography, Ecological Modeling,Ecology Letters, Ecosystems, Geophysical Research Letters, Global Change Biology, Hydrological Processes, International Journal of Remote Sensing, Journal of Forest Research, Journal of Geophysical Research – Atmospheres, Journal of Geophysical Research – Biogeosciences, Journal of Hydrology, Journal of Hydrometeorology, Limnology & Oceanography, Oecologia, Proceedings of the National Academy of Sciences of the United States of America, Remote Sensing of Environment, Reviews of Geophysics, Water Resources Research.

Proposal Reviewer, National Science Foundation, Department of Energy-NICCR

Panelist, National Science Foundation Hydrologic Sciences program (April 2010, October 2010, October 2011, April 2012)

Co-Chair, Special Session, AGU Fall Meeting (1999, 2007, 2009, 2012)

Member, AGU Committee on Large Scale Field Experimentation (2008-2010)

Member, CUAHSI Instrumentation Standing Committee (2010-present)

Review Committee, American Geophysical Union Horton Research Awards, (2012-present)

PUBLICATIONS(*-graduate student author; **-undergraduate student author)

Peer-Reviewed Journal Articles

*Tully, K., Lawrence, D., and T. M. Scanlon, More trees less loss: Nitrogen leaching losses decrease with increasing biomass in coffee agroforests, Agriculture, Ecosystems & Environment, 161, 137-144, doi:10.1016/j.agee.2012.08.002, 2012.

Scanlon, T.M., and W. P. Kustas, Partitioning evapotranspiration using an eddy covariance-based technique: Improved assessment of soil moisture and land-atmosphere exchange dynamics, Vadose Zone Journal, 11, doi: 10.2136/vzj2012.0025, 2012.

*Riscassi, A. L., and T. M. Scanlon, Controls on stream water dissolved mercury in three mid-Appalachian forested headwater catchments, Water Resources Research, 47, W12512, doi:10.1029/2011WR010977, 2011.

*Riscassi, A. L., **Hokanson, K .J. and T.M. Scanlon,Streamwater particulate mercury and suspended sediment dynamics in a forested headwater catchment, Water, Air, and Soil Pollution,doi:10.1007/s11270-010-0731-3, 2011.

Manfreda, S., T. M. Scanlon, and K. K. Caylor, On the importance of accurate depiction of infiltration processes on modelled soil moisture and vegetation water stress, Ecohydrology, 3, 155-165, 2010.

Scanlon, T. M., **Ingram, S. M., and *A. L. Riscassi, Terrestrial and in-stream influences on the spatial variability of nitrate in a forested headwater catchment, Journal of Geophysical Research – Biogeosciences, 115, G02022, doi:10.1029/2009JG001091, 2010.

*Riscassi, A. L., *Converse, A. D., **Hokanson, K. J. and T.M. Scanlon,Evaluation of an automated sampling technique to measure total mercury in streamwater during storm events, Journal of Environmental Monitoring,12, 1833-1839, 2010.

*Converse, A. D., *A. L. Riscassi, and T. M. Scanlon, Seasonal variability in gaseous mercury fluxes measuredin a high-elevation meadow, Atmospheric Environment, 44, 2176-2185, 2010.

Scanlon, T. M., and W. P. Kustas, Partitioning carbon dioxide and water vapor fluxes using correlation analysis, Agricultural and Forest Meteorology, 150, 89-99, 2010.

Caylor, K. K., T. M. Scanlon, and I. Rodriguez-Iturbe, Ecohydrological optimization of pattern and processes in water-limited ecosystems: A trade-off-based hypothesis, Water Resources Research, 45, W08407, doi:10.1029/2008WR007230, 2009.

*Riscassi, A. L., and T. M. Scanlon, Nitrate variability in hydrological flowpaths for three Mid-Appalachian forested watersheds following a large-scale defoliation, Journal of Geophysical Research – Biogeosciences, 114, G02009, doi:10.1029/2008JG000860, 2009.

D’Odorico, P., T. M. Scanlon, *C. W. Runyan, **K. Abshire, **P. Barrett, *A. Bhattachan, *J. J. Coloso, **A. Erler, *J. Miller, **N. Mitchell, *J. Mobley, **D. Van Vleet, and *E. Whitman, Dryland ecohydrology: Research perspectives, Annals of Arid Zone, 48, 1-29, 2009.

Scanlon, T. M., and *P. Sahu, On the correlation structure of water vapor and carbon dioxide in the atmospheric surface layer: A basis for flux partitioning, Water Resources Research, 44, W10418, doi:10.1029/2008WR006932, 2008.

Scanlon, T. M., K. K. Caylor, S. A. Levin, and I. Rodriguez-Iturbe, Positive feedbacks promote power-law clustering of Kalahari vegetation, Nature, 449 (7159), 209-U4, 2007.[Rated “Must Read” by Faculty of 1000 Biology]

D’Odorico, P., K. Caylor, G. S. Okin, and T. M. Scanlon, On the soil moisture – vegetation feedbacks and their possible effects on the dynamics of dryland ecosystems, Journal of Geophysical Research – Biogeosciences, 112, G04010, doi:10.1029/2006JG000379, 2007.

**Grady, A. E., T. M. Scanlon, and J. N. Galloway, Declines in dissolved silica concentrations in western Virginia streams (1988-2003): Gypsy moth defoliation stimulates diatoms?, Journal of Geophysical Research – Biogeosciences, 112, G01009, doi:10.1029/2006JG000251, 2007.

Williams, C. A., T. M. Scanlon, and J. D. Albertson, Influence of surface heterogeneity on scalar dissimilarity in the roughness sublayer, Boundary-Layer Meteorology, 122, 149-165, doi:10.1007/s10546-006-9097-x, 2007.

Scanlon, T. M., K. K. Caylor, S. Manfreda, S. A. Levin, and I. Rodriguez-Iturbe, Dynamic response of grass cover to rainfall variability: Implications for the function and persistence of savanna ecosystems, Advances in Water Resources, 28, 291-302, 2005.

Scanlon, T. M., G. Kiely, and R. Amboldi, Model determination of non-point source phosphorus transport pathways in a fertilized grassland catchment, Hydrological Processes, 19, 2801-2814, 2005.

Leahy, P., G. Kiely, and T. M. Scanlon, Managed grasslands: A greenhouse gas source or sink?, Geophysical Research Letters, 31, L20507, doi:10.1029/2004GL021161, 2004.

Caylor, K. K., T. M. Scanlon, and I. Rodriguez-Iturbe, Feasible optimality of vegetation patterns in rivers, Geophysical Research Letters, 31, L13502, doi:10.1029/2004GL020260, 2004.

Scanlon, T. M., G. Kiely, and X. Quishi, A nested catchment approach for defining the hydrological controls on phosphorus transport, Journal of Hydrology, 291(3-4), 218-231, 2004.

Scanlon, T. M., and J. D. Albertson, Canopy scale measurements of CO2 and water vapor exchange along a precipitation gradient in southern Africa, Global Change Biology, 10(3), 329-341, 2004.

Scanlon, T. M., and J. D. Albertson, The effects of water availability on the coupled land-atmosphere exchange of CO2, water, and energy over a heterogeneous surface, Journal of Hydrometeorology, 4(5), 798-797, 2003.

Scanlon, T. M., and J. D. Albertson, Inferred controls on tree/grass composition in a savanna ecosystem: Combining 16-Year NDVI data with a dynamic soil moisture model, Water Resources Research, 39(8), 1224, doi:10.1029/2002WR001881, 2003.

Scanlon, T. M., and G. Kiely, Ecosystem-scale measurements of nitrous oxide fluxes for an intensely grazed, fertilized grassland, Geophysical Research Letters, 30(16), 1852, doi:10.1029/2003GL017454, 2003.

Scanlon, T. M., J. D. Albertson, K. K. Caylor, and C. A. Williams, Determining land surface fractional cover from NDVI and rainfall time series for a savanna ecosystem, Remote Sensing of Environment, 82(2-3), 376-388, 2002.

Scanlon, T. M. and J. D. Albertson, Turbulent transport of carbon dioxide and water vapor within vegetation canopies during unstable conditions: Identification of episodes using wavelet analysis, Journal of Geophysical Research, 106, D7, 7251-7262, 2001.

Hornberger, G. M., T. M. Scanlon, and J. P. Raffensperger, Modeling transport of dissolved silica in a forested headwater catchment: The effect of hydrological and chemical time scales on hysteresis in the concentration-discharge relationship, Hydrological Processes, 15, 2029-2038, 2001.

Scanlon, T. M., J. P. Raffensperger, and G. M. Hornberger, Modeling transport of dissolved silica in a forested headwater catchment: Implications for defining the hydrochemical response of observed flow pathways, Water Resources Research, 37, 4, 1071-1082, 2001.

Albertson, J. D., W. P. Kustas, and T. M. Scanlon, Large eddy simulation over heterogeneous terrain with remotely sensed land surface conditions, Water Resources Research, 37, 7, 1939-1953, 2001.

Scanlon, T. M., J. P. Raffensperger, G. M. Hornberger, and R. B. Clapp, Shallow subsurface storm flow in a headwater catchment: Observations and modeling using a modified TOPMODEL, Water Resources Research, 36, 9, 2575-2586, 2000.

Manuscripts in Review

**Gunda, T., and T. M. Scanlon, Influence of catchment aspect on mercury abundance in leaf litter and soils, in review, Water, Air & Soil Pollution.

*Riscassi, A. L., and T. M Scanlon, Factors controlling dissolved and particulate mercury export from three forested, upland Appalachian catchments, in review, Science of the Total Environment.

*Good, S. P., K. Soderberg, K. Guan, E. G. King, T. M. Scanlon, and K. K. Caylor, 2H Isotopic flux partitioning (IFP) of evapotranspiration over a grass field following a water pulse and subsequent drydown, in review, Water Resources Research.

*Robison, A. L., T. M. Scanlon, B. J. Cosby, J. R. Webb, and J. N. Galloway, Sulfate adsorption controlled and base cation limited recovery from acidification in streams of western Virginia, in review, Biogeochemistry.

Manuscripts in Progress

*Converse, A. D., *A. L. Riscassi, and T. M. Scanlon, Significance of dew deposition in surface-atmosphere exchange of mercury over a meadow, in preparation for Journal of Geophysical Research - Atmospheres.

*Funk, C. S., and T. M. Scanlon, Factors contributing to the spatial variability of N2O fluxes in a Virginia salt marsh, in preparation for Estuaries and Coasts.

Berg, P., M. Huettel, M. Long, T. J. Griffis, P. L. Wiberg, and T. M. Scanlon, Eddy correlation flux measurements: Flux extractions from measured data, in preparation for Limnology and Oceanography: Methods.

Epstein, H.E., T.M. Scanlon, G.J. Jia, and L. J. Alvarez, Coincidence of spatial and temporal variance in vegetation across terrestrial ecosystems, in preparation for Nature.

Book Chapters (Peer Reviewed)

Albertson, J. D., C. A. Williams, T. M. Scanlon, and N. Montaldo, Soil moisture controls on water and carbon fluxes in semi-arid regions, Dryland Ecohydrology, P. D’Odorico and A. Porporato (Eds.), Dordrecht: Springer, pp. 67-84, 2006.

Scanlon, T. M., J. D. Albertson, and W. P. Kustas, Scale effects in estimating large eddy-driven sensible heat fluxes over heterogeneous terrain, in Remote Sensing in Hydrology 2000, M. Owe, K. Brubaker, J. Ritchie and A. Rango (Eds.), IAHS Publ. No. 267, pp. 175-180, 2001.

Albertson, J. D., T. M. Scanlon, A.T. Cahill, and W. P. Kustas, Estimating surface energy fluxes with remotely sensed data, in Remote Sensing in Hydrology 2000, M. Owe, K. Brubaker, J. Ritchie and A. Rango (Eds.), IAHS Publ. No. 267, pp. 145-150, 2001.

Kustas, W. P., J. D. Albertson, T. M. Scanlon, and A. T. Cahill, Issues in monitoring evapotranspiration with radiometric temperature observations, in Remote Sensing in Hydrology 2000, M. Owe, K. Brubaker, J. Ritchie and A. Rango (Eds.), IAHS Publ. No. 267, pp. 239-245, 2001.

Technical Reports

K. Caylor, T. M. Scanlon, and I. Rodriguez-Iturbe, Ecohydrological optimization of pattern and processes in water-limited ecosystems, Water and the Environment: 12-14 November 2005, I. Rodriguez-Iturbe and M. S. Sorondo (Eds.), Pontifical Academy of Sciences, 2007.

Welty, C., A. J. Miller, K. Belt, J. A. Smith, L. Band, P. Groffman, T. M. Scanlon, J. Warner, R. Ryan, D. Yeskis, M. McGuire, Design of an environmental field observatory for quantifying the urban water budget, Cities of the Future: Creating Blue Water in Green Cities, Johnson Foundation, 2006.

Scanlon, T. M., The role of water availability in controlling coupled vegetation-atmosphere dynamics, Ph.D. dissertation, University of Virginia, Charlottesville, VA, 2002.

Scanlon, T. M., Modeling stream discharge and dissolved silica variations in a forested headwater catchment: A hydrological pathway approach, M.S. thesis, University of Virginia, Charlottesville, VA, 1999.

Clapp, R. B., D. D. Huff, T. M. Scanlon, and D. M. Borders, Surface Water Project Technical Bulletin No. 1: Radionuclide dishcarge in White Oak Creek, 1995. ORNL/ER-5333, 1995.

D. M. Borders, D. S. Hicks, R. B. Clapp, and T. M. Scanlon, Surface Water Project Technical Bulletin No. 2: Effectiveness of Sr-90 removal actions in the White Oak Creek watershed, 1995. ORNL/ER-5334, 1995.

Borders, D. M., D. J. Pridmore, J. J. Beauchamp, D. E. McDonnel, S. T. Purucker, and T. M. Scanlon, Waste Area Group 2 Phase I Remedial Investigation Tributary Data Assessment Report. ORNL/ER-362, 1996.

INVITED LECTURES PRESENTED

MaryBaldwinCollege, Department of Biology, Humphreys Lecture (2012)

Agricultural Research Service, U.S. Department of Agriculture (2012)

AGU Fall Meeting (2011)

European Geophysical Union, Annual General Assembly (2011)

Virginia Tech, Department of Forest Resources and Environmental Conservation (2011)

Association of American Geographers, Annual Meeting (2010)

University of Colorado, Dept. of Ecology and Evolutionary Biology (2010)

BostonUniversity, Dept. of Earth Sciences (2009)

AGU Fall Meeting (2008)

Baltimore Ecosystem Study LTER Annual Meeting (2007)

MathScienceInnovationCenter, Richmond, Virginia (2007)

AGU Fall Meeting (2005)

AGU Spring Meeting (2005)

University of Notre Dame, Dept. of Civil & Environmental Engineering (2004)

PennsylvaniaStateUniversity, Dept. of Civil & Environmental Engineering (2004)

University of Nebraska, Dept. of Geosciences (2004)

CornellUniversity, Dept. of Biological & Environmental Engineering (2003)

University of North Carolina, Dept. of Geography (2002)

PRESENTATIONS AT NATIONAL AND INTERNATIONAL MEETINGS

Scanlon, T. M., and A. L. Riscassi, Controls on mercury transport from forested headwater catchments in ShenandoahNational Park and beyond, American Geophysical Union 2012 Fall Meeting, San Francisco, CA.

Robison, A. L., T. M. Scanlon, B. J. Cosby, J. R. Webb, and J. N. Galloway, Base cation controlled recovery from acidification in streams in the Ridge/Blue Ridge provinces, American Geophysical Union 2012 Fall Meeting, San Francisco, CA.

Scanlon, T. M., and W. P. Kustas, Partitioning water vapor and carbon dioxide fluxes: A method based on correlation analysis of high-frequency time series, American Geophysical Union 2011 Fall Meeting, San Francisco, CA– [INVITED].

Scanlon, T.M., Converse, A.D., Riscassi, A.L, and J.S. Fischel, Inferring vegetation-atmosphere gaseous elemental mercury exchange processes from multi-seasonal canopy-scale measurements, The 10th International Conference on Mercury as a Global Pollutant (ICMGP), Halifax, Nova Scotia, 2011.

Riscassi, A.L., and T.M. Scanlon, Controls on streamwater HgD and DOC export from three mid-Appalachian forested headwater catchments, The 10th International Conference on Mercury as a Global Pollutant (ICMGP), Halifax, Nova Scotia, 2011.

Scanlon, T. M., A new approach to unraveling the contributions to soil moisture dynamics arising from the distinct processes of soil evaporation and plant transpiration, European Geophysical Union 2011 General Assembly, Vienna, Austria – [INVITED].

Riscassi, A. L., Hokanson, K. J., and T. M. Scanlon,Streamwater particulate mercury and suspended sediment dynamics in a forested headwater catchment, American Geophysical Union 2010 Fall Meeting, San Francisco, CA.

Scanlon, T. M.,An evaluation of the 'greening up' phenomenon in drylands: The Kalahari Transect, Association of American Geographers, 2010 Annual Meeting, Washington, D.C. – [INVITED].

Riscassi, A. and T. M. Scanlon, Streamwater mercury dynamics within three headwater catchments in Shenandoah National Park, VA, American Geophysical Union 2009 Fall Meeting, San Francisco, CA.

Converse, A., T. M. Scanlon, and A. Riscassi, Seasonal atmospheric mercury fluxes in ShenandoahNational Park, American Geophysical Union 2009 Fall Meeting, San Francisco, CA.

Funk, C. S., and T. M. Scanlon, Nitrous oxide fluxes at Cobb Mill Creek marsh on the eastern shore of Virginia, American Geophysical Union 2009 Fall Meeting, San Francisco, CA.

Gunda, T., A. Converse, A. Riscassi, and T. M. Scanlon, Topographical and hydrological influences on the spatial distribution of mercury at the catchment scale, American Geophysical Union 2009 Fall Meeting, San Francisco, CA.

Scanlon, T.M., S. M. Ingram, and A. L. Riscassi, Terrestrial and in-stream influences on the spatial variability of nitrate in a forested headwater catchment, Gordon Research Conference, Proctor Academy, NH, 2009.

Scanlon, T. M., Partitioning water vapor and carbon dioxide fluxes using correlation analysis, American Geophysical Union 2008 Fall Meeting, San Francisco, CA– [INVITED].

Scanlon, T. M., A. L. Riscassi, and S. M. Ingram, Nitrate temporal dynamics and controls on spatial variability in a forested headwater catchment following disturbance, American Geophysical Union 2008 Fall Meeting, San Francisco, CA.

Riscassi, A. L., and T. M. Scanlon, Investigation of automated sampling techniques to measure total mercury in stream water during storm events, American Geophysical Union 2008 Fall Meeting, San Francisco, CA.

Converse, A. D., and T. M. Scanlon, Physical vs. biological controls over mercury fluxes in Shenandoah National Park, Virginia, American Geophysical Union 2008 Fall Meeting, San Francisco, CA.

Caylor, K. K., and T. M. Scanlon, Transitions between facilitative/competitive effects of tree canopies on herbaceous productivity via impacts on energy/water balance, Ecological Society of America, 93rd Annual Meeting, Milwaukee, WI, August 2008.

Scanlon, T. M., and P. Sahu, On the transient correlation structure of water vapor and carbon dioxide time series over low-profile vegetation, American Geophysical Union 2007 Fall Meeting, San Francisco, CA, 2007.

Ingram, S. M., and T. M. Scanlon, Controls on nitrate spatial variability in Paine Run catchment of Shenandoah National Park, American Geophysical Union 2007 Fall Meeting, San Francisco, CA, 2007.

Riscassi, A. L., and T. M. Scanlon, Nitrate variability in hydrological flowpaths for a mid-Appalachian forested catchment following a large-scale defoliation, American Geophysical Union 2007 Fall Meeting, San Francisco, CA, 2007.

(T. M. Scanlon one of 16 authors), Baltimore WATERS test bed – Quantifying groundwater in urban areas, American Geophysical Union 2007 Fall Meeting, San Francisco, CA, 2007.

Scanlon, T. M., P. D’Odorico, G. S. Okin, and K. K. Caylor, Effects of mean annual rainfall on landscape-level distributions of soil moisture and soil development in a semi-arid ecosystem, American Geophysical Union 2006 Fall Meeting, San Francisco, CA, 2006.

Caylor, K. K., T. M. Scanlon, and I. Rodriguez-Iturbe, Ecohydrological optimization of pattern and processes in water-limited ecosystems, American Geophysical Union 2006 Fall Meeting, San Francisco, CA, 2006.

Grady, A. E., T. M. Scanlon, and J. N. Galloway, Declines in dissolved silica concentrations in western Virginia streams (1988- 2003), American Geophysical Union 2006 Fall Meeting, San Francisco, 2006.

Wang, L., K. K. Caylor, P. D’Odorico, L. Ries, G. S. Okin, R. Swap, H. H. Shugart, T. M. Scanlon, and S. A. Macko, Vegetation and soil responses to fertilization along the Kalahari Transect, American Geophysical Union 2006 Fall Meeting, San Francisco, CA 2006.

Scanlon, T. M., Influence of rainfall variability on canopy clustering in a savanna ecosystem, American Geophysical Union, Fall Meeting, San Francisco, CA, 2005. – [INVITED].

Scanlon, T. M., Methods for determining how water availability affects vegetation pattern and process,American Geophysical Union, Joint Assembly, New Orleans, LA, 2005. – [INVITED].

Scanlon, T. M., Rainfall-vegetation coupling in semi-arid regions: Influence of the nitrogen cycle on vegetation temporal dynamics, American Geophysical Union, Fall Meeting, San Francisco, CA, 2004.

One of 19 authors, The Potomac River basin and Western Shore Chesapeake Bay drainage as a proposed CUAHSI hydrologic observatory, American Geophysical Union, Fall Meeting, San Francisco, CA, 2004.

Scanlon, K. K. Caylor, and I. Rodriguez-Iturbe, Ecohydrological significance of observed power-law distributions of tree canopy cluster sizes for savanna vegetation,American Geophysical Union, Joint Assembly, Montreal, Quebec, 2004.

Caylor, K. K., T. M. Scanlon, and I. Rodriguez-Iturbe, Feasible optimality of vegetation patterns in river basins, American Geophysical Union, Joint Assembly, Montreal, Quebec, 2004.

Shugart, H. H., K. K. Caylor, T. M. Scanlon, and I. Rodriguez-Iturbe, Assessing the role of spatial pattern in governing ecohydrological interactions and vegetation dynamics in semi-arid savannas, American Geophysical Union, Fall Meeting, San Francisco, CA, 2003.

Scanlon, T. M., and G. Kiely, Nitrous oxide emissions from an Irish pasture: Inferred controls on fluxes measured by an eddy covariance system with a tunable diode laser,EGS-AGU-EUG Joint Assembly, Nice, France, 2003.