Angela Knapp Webpage

Angela Knapp

Research

Angela Knapp, Ph.D.

Postdoctoral Researcher

University of Miami
RSMAS/MAC
4600 Rickenbacker Causeway
Miami, FL 33149

(305) 421-4241

aknapp@rsmas.miami.edu

I am a postdoc working with Dr. Dennis Hansell in the Marine and Atmospheric Chemistry department at the Rosenstiel School for Marine and Atmospheric Science at the Univesity of Miami. I study the marine nitrogen cycle on a range of temporal and spatial scales, from molecular and physiological scales up to ocean-basin scale estimates of fluxes of nitrogen to the ocean based on the distribution of geochemical tracers.

Research Interests

Nitrogen cycling, especially in the ocean; using the isotopic composition of nitrogenous species to identify sources of new nitrogen to, and losses from the ocean; stable isotope geochemistry; dissolved organic nitrogen isotopic composition and bulk organic matter cycling; biomarkers as indicators of environmental changes, and organic matter cycling and composition.

Angie's CV

Funding

NSF Chemical Oceanography: Collaborative research: Documenting N2 fixation in N deficient waters of the Eastern Tropical South Pacific. Start date: 8/15/2009, $164,358

NSF Chemical Oceanography: Direct measurement of dissolved organic nitrogen concentration and 15N/14N ratio. Start date: 10/1/2009, $356,314.

Publications

Spencer, P.K., and A.N. Knapp, 2009, Sedimentology, New stratigraphic markers in the late Pleistocene Palouse loess: novel fossil gastropods, absolute age constraints, and non-eolian facies, doi: 10.1111/j.1365-3091.2009.01085.x

Sigman, D.M., P.J. DiFiore, M.P. Hain, C. Deutsch, Y. Wang, D.M. Karl, A.N. Knapp, M.F. Lehmann, and S. Pantoja, 2009, The dual isotopes of deep nitrate as a constraint on the cycle and budget of oceanic fixed nitrogen. Deep-Sea Res. I, 56, 1419-1439, doi:10.1016/j.dsr.2009.04.007

Knapp, A.N., M.G. Hastings, D.M. Sigman, F. Lipschultz and J.N. Galloway, 2008, The flux and isotopic composition of reduced and total nitrogen in Bermuda rain, 2008, Marine Chemistry, doi:10.1016/j.marchem.2008.08.007

Knapp, A.N., P.J. DiFiore, C. Deutsch, D.M. Sigman, and F. Lipschultz, 2008, Nitrate isotopic composition between Bermuda and Puerto Rico Implications for N2 fixation in the Atlantic Ocean, Global Biogeochem. Cycles, 22, GB3014.

Capone, D.G., and A.N. Knapp, 2007, A marine nitrogen cycle fix?, Nature, 445, 159-160

Knapp, A.N., D.M. Sigman, and F. Lipschultz, 2005, N isotopic composition of dissolved organic nitrogen and nitrate at the Atlantic Time-series Study site, Global Biogeochem. Cycles, 19, GB1018, doi:10.1029/2004GB002320

Sigman, D.M., R. Robinson, A.N. Knapp, A. van Geen, D.C. McCorkle, J.A. Brandes, and R.C. Thunell, 2003, Distinguishing between water column and sedimentary denitrification in the Santa Barbara Basin using the stable isotopes of nitrate, Geochem., Geophys., Geosyst., 4, 1040, doi:10.1029/2002GC000394, 2003.

Education and Training

2009 - Present Postdoctoral researcher with Dennis Hansell, Marine and Atmospheric Chemsitry department, RSMAS, University of Miami.

2006 - 2008 NOAA/UCAR Climate and Global Change Postdoctoral Fellow , hosted by (Doug Capone, University of Southern California, Marine and Environmental Biology Dept.

2000 - 2006 Ph.D., Princeton University, Princeton, NJ, Dept. of Geosciences (Daniel Sigman, advisor)

1999 - 2000 Technician, University of Washington, Chemical Oceanography Dept.

1996 - 1999 B.A., Whitman College, Walla Walla, WA, Biology-Geology

1995-1996 University of Washington, Honors Program coursework

Broader impacts and service

Co-founder of Southern California Team Nitrogen research consortium and USC WiSE Postdoc group

Referee for Global Biogeochemical Cycles, Limnology and Oceanography, Biogeosciences, Biogeochemistry, Geology, Nitrogen in the Marine Environment (book chapter), Annals of Glaciology, and of proposals for NSF and MIT/Massachusetts Sea Grant