Education
2020: PhD, Earth and Ocean Sciences, Duke University
2012: MS, Land Resources and Environmental Sciences, Montana State University
2007: BS, Environmental Science, University of North Carolina - Chapel Hill
Publications and Datasets
Grande, E., M.A. Zimmer, J.M. Mallard. 2022. Storage variability controls seasonal runoff generation in catchments at the threshold between energy and water limitation. Hydrological Processes. doi: 10.1002/hyp.14697
Christensen, A.L., J.M. Mallard, J. Nghiem, J. Harringmeyer, M. Simard, T.M. Pavelsky, M.P. Lamb, and C.G. Fichot. 2022. Delta-X: Sonar Bathymetry Survey of Channels, MRD, Louisiana, 2021. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/2085
Christensen, A.L., J.M. Mallard, M. Simard, T.M. Pavelsky, and A. Rovai. 2022. Delta-X: In-situ Water Surface Elevation, MRD, Louisiana, USA, 2021. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/2086
Christensen, A.L., J.M. Mallard, and J. Nghiem. 2021. Delta-X: Acoustic Doppler Current Profiler Channel Surveys, Coastal Louisiana, 2021. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1939
Seybold, E.C., M.L. Fork, A.E. Braswell, J.R. Blaszczak, M.R. Fuller, K.E. Kaiser, J.M. Mallard, M.A. Zimmer. 2021. A Classification Framework to Assess Ecological, Biogeochemical, and Hydrologic Synchrony and Asynchrony. Ecosystems. doi: 10.1007/s10021-021-00700-1
Foroughi, M., J.M. Mallard, D.R. Nelson, L.A. Sutter, D. Markewitz. 2021. The impacts of historical land-use on phosphorus movement in the Calhoun Critical Zone Observatory in the southeastern US Piedmont. Biogeochemistry. doi: 10.1007/s10533-021-00794-8
Wlostowski, A.N., Molotch, S.P. Anderson, S. Brantley, J. Chorover, D. Dralle, P. Kumar, L. Li, K. A. Lohse, J.M. Mallard, J.C. McIntosh, S.F. Murphy, E. Parrish, M. Safeeq, C. Harman. 2021. Signatures of Hydrologic Function and Coevolution Across the Critical Zone Observatory Network. Water Resources Research. doi: 10.1029/2019WR026635
Hodges, C.A., J.M. Mallard, D. Markewitz, D. Barcellos, A. Thompson. 2019. Seasonal and spatial variation in the potential for iron reduction in soils of the Southeastern Piedmont of the US. Catena.
Bergstrom, A.B., B.L. McGlynn, J.M. Mallard, and T.P. Covino. 2016. Watershed structural influences on the distributions of stream network water and solute travel times. Hydrological Processes. HYP-15-0739.
Mallard, J.M., B.L. McGlynn, T.P. Covino. 2014. Lateral inflows, stream-groundwater exchange, and network geometry influence streamwater composition. Water Resources Research, 50, doi:10.1002/2013WR014944.
Covino, T.P., B.L. McGlynn, and J.M. Mallard. 2011. Stream – groundwater exchange and hydrologic turnover at the network scale. Water Resources Research. doi:10.1029/2011WR010942.
Selected Presentations
Mallard, J.M., G. Pignotti, S. Wondzell, S. Johnson, G. Grant, R. Fasth. Decreasing Late-Summer Low-Flows in the Pacific Northwest: Describing the scope of the problem and exploring its implications across scale. 8th Interagency Conference on Research in the Watersheds (ICRW8). Corvallis, OR. Oral.
Braswell, A.E., J.M. Mallard, and M.R.V. Ross. Novel Landforms: integrating humans as key drivers of process and form in geomorphology. 2022 Joint Aquatic Sciences Meeting. Grand Rapids, MI. Oral.
Mallard, J.M., T.M. Pavelsky, E.B. Goldstein, S.N. Topp, M.R.V. Ross. Seasonality and asynchrony of bank vegetation and riverine suspended sediment concentrations in global deltas. 2021 AGU General Assembly. New Orleans, LA. Oral.
Mallard, J.M., E. Grande, M.A. Zimmer. Catchment storage state controls event-scale runoff generation in catchments at the threshold between water- and energy-limitation. 2021 AGU General Assembly. New Orleans, LA. Oral.
Grande, E., M.A. Zimmer, and J.M. Mallard. 2020. Dynamic catchment water storage-discharge partitioning across water and energy-limited catchments. 2020 AGU General Assembly.
Mallard, J.M., B.L. McGlynn, and D.D. Richter. 2019. Storage volume and depth drives runoff generation in a deep and highly weathered headwater watershed. 2019 AGU General Assembly. San Francisco, CA. Oral.
Mallard, J.M., B.L. McGlynn, D.D. Richter, and M.A. Zimmer. 2019 The Calhoun Critical Zone Observatory: historic hydrologic research in a complex socio-environmental context reinvigorated and expanded by critical zone science. 2019 AGU General Assembly. San Francisco, CA.
Mallard, J.M., B.L. McGlynn, and D.D. Richter. 2018. Seasonal and event-scale runoff and storage dynamics in a steep, deep, highly weathered critical zone. 2018 AGU General Assembly. Washington, DC
Mallard, J.M., B.L. McGlynn, and D.D. Richter. 2018. Critical zone structural influences on runoff generation in a steep, deep, watershed. CUAHSI 2018 Biennial Colloquium. Shepardstown, WV
Mallard, J.M., B.L. McGlynn, and D.D. Richter. 2017. Terrain and subsurface influences on runoff generation in a highly weathered system. 2017 AGU General Assembly. New Orleans, LA
Mallard, J.M., B.L. McGlynn, and D.D. Richter. 2017. Subsurface and terrain controls on runoff generation in deep soil landscapes. 2017 EGU General Assembly. Vienna, Austria
Mallard, J.M., B.L. McGlynn, and T.P. Covino. 2016. Hydrologic and biologic influences on stream network nutrient concentrations: Interactions of hydrologic turnover and concentration-dependent nutrient uptake. 2016 EGU General Assembly. Vienna, Austria [OUTSTANDING STUDENT POSTER AWARD]
Mallard, J.M., B.L. McGlynn, D.D. Richter, G.S. Hancock. 2014. The Calhoun Critical Zone Observatory: understanding the evolution of the critical zone after centuries of anthropogenic degradation. Eos Trans. AGU, Fall Meet. Suppl., Abstract H43D-0983. San Francisco, CA
Mallard, J.M., B. McGlynn, D.D. Richter, D. Markewitz, Z. Brecheisen. 2014. Calhoun CZO: understanding critical zone evolution after a legacy of degradation. CUAHSI 2014 Biennial Colloquium. Shepardstown, WV
Mallard, J.M., B.L. McGlynn, T.P. Covino, A.J. Bergstrom. 2013. The combined influence of stream network scale physical and biogeochemical processes on in-stream nutrient concentrations. Montana Chapter of the American Water Resources Association Annual Meeting. Bozeman, MT
Mallard, J.M., B.L. McGlynn, T.P. Covino, and A.J. Bergstrom. 2012. Hydrologic and biologic influences on stream network nutrient concentrations: Interactions of hydrologic turnover and concentration-dependent nutrient uptake. Section: Biogeosciences. Eos Trans. AGU, Fall Meet. San Francisco, CA
Mallard, J.M., B.L. McGlynn, and T.P. Covino. 2012. Hydrologic and biologic controls on instream nutrient concentration: interactions of hydrologic turnover with concentration dependent nutrient uptake. Canadian Geophysical Union Annual Meeting. Banff, Canada
Mallard, J.M., T.P. Covino, and B.L. McGlynn. 2011. Watershed structure, stream network geometry, and kinetic influences on instream nutrient retention. Eos Trans. AGU, Fall Meet. Suppl., Abstract B13G-0650. San Francisco, CA. Oral.
Mallard, J.M., T.P. Covino, and B.L. McGlynn. 2011. Instream nutrient concentrations: How groundwater/stream water exchange and nutrient uptake can interact in stream networks. Montana Chapter of the American Water Resources Association Annual Meeting. Great Falls, MT [STUDENT ORAL PRESENTATION AWARD]
Mallard, J.M., T.P. Covino, B.L. McGlynn , and A.J. Bergstrom. 2011. Watershed and stream network structure influences on physical and biological nutrient retention and stream water sources. Geophysical Research Abstracts Vol. 13, EGU2011-12910, 2011 EGU General Assembly. Vienna, Austria. Oral.
Mallard, J.M., T.P. Covino, B.L. McGlynn, 2010. The role of stream network complexity in hydrologic turnover, nutrient retention, and watershed outlet signatures. Eos Trans. AGU, Fall Meet. Suppl., Abstract H21C-1060. San Francisco, CA [STUDENT PAPER AWARD]
2020: PhD, Earth and Ocean Sciences, Duke University
2012: MS, Land Resources and Environmental Sciences, Montana State University
2007: BS, Environmental Science, University of North Carolina - Chapel Hill
Publications and Datasets
Grande, E., M.A. Zimmer, J.M. Mallard. 2022. Storage variability controls seasonal runoff generation in catchments at the threshold between energy and water limitation. Hydrological Processes. doi: 10.1002/hyp.14697
Christensen, A.L., J.M. Mallard, J. Nghiem, J. Harringmeyer, M. Simard, T.M. Pavelsky, M.P. Lamb, and C.G. Fichot. 2022. Delta-X: Sonar Bathymetry Survey of Channels, MRD, Louisiana, 2021. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/2085
Christensen, A.L., J.M. Mallard, M. Simard, T.M. Pavelsky, and A. Rovai. 2022. Delta-X: In-situ Water Surface Elevation, MRD, Louisiana, USA, 2021. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/2086
Christensen, A.L., J.M. Mallard, and J. Nghiem. 2021. Delta-X: Acoustic Doppler Current Profiler Channel Surveys, Coastal Louisiana, 2021. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1939
Seybold, E.C., M.L. Fork, A.E. Braswell, J.R. Blaszczak, M.R. Fuller, K.E. Kaiser, J.M. Mallard, M.A. Zimmer. 2021. A Classification Framework to Assess Ecological, Biogeochemical, and Hydrologic Synchrony and Asynchrony. Ecosystems. doi: 10.1007/s10021-021-00700-1
Foroughi, M., J.M. Mallard, D.R. Nelson, L.A. Sutter, D. Markewitz. 2021. The impacts of historical land-use on phosphorus movement in the Calhoun Critical Zone Observatory in the southeastern US Piedmont. Biogeochemistry. doi: 10.1007/s10533-021-00794-8
Wlostowski, A.N., Molotch, S.P. Anderson, S. Brantley, J. Chorover, D. Dralle, P. Kumar, L. Li, K. A. Lohse, J.M. Mallard, J.C. McIntosh, S.F. Murphy, E. Parrish, M. Safeeq, C. Harman. 2021. Signatures of Hydrologic Function and Coevolution Across the Critical Zone Observatory Network. Water Resources Research. doi: 10.1029/2019WR026635
Hodges, C.A., J.M. Mallard, D. Markewitz, D. Barcellos, A. Thompson. 2019. Seasonal and spatial variation in the potential for iron reduction in soils of the Southeastern Piedmont of the US. Catena.
Bergstrom, A.B., B.L. McGlynn, J.M. Mallard, and T.P. Covino. 2016. Watershed structural influences on the distributions of stream network water and solute travel times. Hydrological Processes. HYP-15-0739.
Mallard, J.M., B.L. McGlynn, T.P. Covino. 2014. Lateral inflows, stream-groundwater exchange, and network geometry influence streamwater composition. Water Resources Research, 50, doi:10.1002/2013WR014944.
Covino, T.P., B.L. McGlynn, and J.M. Mallard. 2011. Stream – groundwater exchange and hydrologic turnover at the network scale. Water Resources Research. doi:10.1029/2011WR010942.
Selected Presentations
Mallard, J.M., G. Pignotti, S. Wondzell, S. Johnson, G. Grant, R. Fasth. Decreasing Late-Summer Low-Flows in the Pacific Northwest: Describing the scope of the problem and exploring its implications across scale. 8th Interagency Conference on Research in the Watersheds (ICRW8). Corvallis, OR. Oral.
Braswell, A.E., J.M. Mallard, and M.R.V. Ross. Novel Landforms: integrating humans as key drivers of process and form in geomorphology. 2022 Joint Aquatic Sciences Meeting. Grand Rapids, MI. Oral.
Mallard, J.M., T.M. Pavelsky, E.B. Goldstein, S.N. Topp, M.R.V. Ross. Seasonality and asynchrony of bank vegetation and riverine suspended sediment concentrations in global deltas. 2021 AGU General Assembly. New Orleans, LA. Oral.
Mallard, J.M., E. Grande, M.A. Zimmer. Catchment storage state controls event-scale runoff generation in catchments at the threshold between water- and energy-limitation. 2021 AGU General Assembly. New Orleans, LA. Oral.
Grande, E., M.A. Zimmer, and J.M. Mallard. 2020. Dynamic catchment water storage-discharge partitioning across water and energy-limited catchments. 2020 AGU General Assembly.
Mallard, J.M., B.L. McGlynn, and D.D. Richter. 2019. Storage volume and depth drives runoff generation in a deep and highly weathered headwater watershed. 2019 AGU General Assembly. San Francisco, CA. Oral.
Mallard, J.M., B.L. McGlynn, D.D. Richter, and M.A. Zimmer. 2019 The Calhoun Critical Zone Observatory: historic hydrologic research in a complex socio-environmental context reinvigorated and expanded by critical zone science. 2019 AGU General Assembly. San Francisco, CA.
Mallard, J.M., B.L. McGlynn, and D.D. Richter. 2018. Seasonal and event-scale runoff and storage dynamics in a steep, deep, highly weathered critical zone. 2018 AGU General Assembly. Washington, DC
Mallard, J.M., B.L. McGlynn, and D.D. Richter. 2018. Critical zone structural influences on runoff generation in a steep, deep, watershed. CUAHSI 2018 Biennial Colloquium. Shepardstown, WV
Mallard, J.M., B.L. McGlynn, and D.D. Richter. 2017. Terrain and subsurface influences on runoff generation in a highly weathered system. 2017 AGU General Assembly. New Orleans, LA
Mallard, J.M., B.L. McGlynn, and D.D. Richter. 2017. Subsurface and terrain controls on runoff generation in deep soil landscapes. 2017 EGU General Assembly. Vienna, Austria
Mallard, J.M., B.L. McGlynn, and T.P. Covino. 2016. Hydrologic and biologic influences on stream network nutrient concentrations: Interactions of hydrologic turnover and concentration-dependent nutrient uptake. 2016 EGU General Assembly. Vienna, Austria [OUTSTANDING STUDENT POSTER AWARD]
Mallard, J.M., B.L. McGlynn, D.D. Richter, G.S. Hancock. 2014. The Calhoun Critical Zone Observatory: understanding the evolution of the critical zone after centuries of anthropogenic degradation. Eos Trans. AGU, Fall Meet. Suppl., Abstract H43D-0983. San Francisco, CA
Mallard, J.M., B. McGlynn, D.D. Richter, D. Markewitz, Z. Brecheisen. 2014. Calhoun CZO: understanding critical zone evolution after a legacy of degradation. CUAHSI 2014 Biennial Colloquium. Shepardstown, WV
Mallard, J.M., B.L. McGlynn, T.P. Covino, A.J. Bergstrom. 2013. The combined influence of stream network scale physical and biogeochemical processes on in-stream nutrient concentrations. Montana Chapter of the American Water Resources Association Annual Meeting. Bozeman, MT
Mallard, J.M., B.L. McGlynn, T.P. Covino, and A.J. Bergstrom. 2012. Hydrologic and biologic influences on stream network nutrient concentrations: Interactions of hydrologic turnover and concentration-dependent nutrient uptake. Section: Biogeosciences. Eos Trans. AGU, Fall Meet. San Francisco, CA
Mallard, J.M., B.L. McGlynn, and T.P. Covino. 2012. Hydrologic and biologic controls on instream nutrient concentration: interactions of hydrologic turnover with concentration dependent nutrient uptake. Canadian Geophysical Union Annual Meeting. Banff, Canada
Mallard, J.M., T.P. Covino, and B.L. McGlynn. 2011. Watershed structure, stream network geometry, and kinetic influences on instream nutrient retention. Eos Trans. AGU, Fall Meet. Suppl., Abstract B13G-0650. San Francisco, CA. Oral.
Mallard, J.M., T.P. Covino, and B.L. McGlynn. 2011. Instream nutrient concentrations: How groundwater/stream water exchange and nutrient uptake can interact in stream networks. Montana Chapter of the American Water Resources Association Annual Meeting. Great Falls, MT [STUDENT ORAL PRESENTATION AWARD]
Mallard, J.M., T.P. Covino, B.L. McGlynn , and A.J. Bergstrom. 2011. Watershed and stream network structure influences on physical and biological nutrient retention and stream water sources. Geophysical Research Abstracts Vol. 13, EGU2011-12910, 2011 EGU General Assembly. Vienna, Austria. Oral.
Mallard, J.M., T.P. Covino, B.L. McGlynn, 2010. The role of stream network complexity in hydrologic turnover, nutrient retention, and watershed outlet signatures. Eos Trans. AGU, Fall Meet. Suppl., Abstract H21C-1060. San Francisco, CA [STUDENT PAPER AWARD]