Research Interests
I am studying how stream restoration and stormwater management influence transport and transformation of nitrogen pollution in stream networks in the Chesapeake Bay watershed. My research is at multiple spatial scales; at the stream network scale I estimate C and N mass balances to determine percent removal rates, at the stream reach scale I use tracer injection studies to estimate nitrogen uptake, and at the stream and wetland feature scale I use 15N stable isotopic tracer experiments to measure in situ denitrification. In addition, I am examining the influence of natural and novel organic carbon sources on denitrification through collaborative work with stable isotopic tracers (15N and 13C) and lipid biomarkers. My PhD work has been funded as a Maryland Sea Grant Fellow, EPA NNEMS Fellow, and a NSF GK-12 Fellow.
Published Papers
Harrison, M. D., P. M. Groffman, P. M. Mayer, S. S. Kaushal, and T. A. Newcomer. 2011. Denitrification in Alluvial Wetlands in an Urban Landscape. Journal of Environment Quality (40) 634. doi: 10.2134/jeq2010.0335.
Sivirichi, G. M., S. S. Kaushal, P. M. Mayer, C. Welty, K. T. Belt, T. A. Newcomer, K. D. Newcomb, and M. M. Grese. 2011. Longitudinal variability in streamwater chemistry and carbon and nitrogen fluxes in restored and degraded urban stream networks. Journal of Environmental Monitoring (13) 288. doi: 10.1039/c0em00055h.
Collins, K. A., T. J. Lawrence, E. K. Stander, R. J. Jontos, S. S. Kaushal, T. A. Newcomer, N. B. Grimm, and M. L. Cole Ekberg. 2010. Opportunities and challenges for managing nitrogen in urban stormwater: A review and synthesis. Ecological Engineering (36) 1507-1519. doi: 10.1016/j.ecoleng.2010.03.015.
*Tammy is a student in the Marine, Estuarine and Environmental Science Program (MEES) with a faculty advisor in Geology.
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TAMMY NEWCOMER