Angela Knapp Webpage

Angela Knapp

Research

Angela Knapp, Ph.D.

Research Assistant Professor

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

(305) 421-4241

aknapp@rsmas.miami.edu

I am a Research Assistant Professor in the Marine and Atmospheric Chemistry division of 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

Group Members

Rob Letscher	Brian Peters	Julie Sanders

Rob is a graduate student with Dennis Hansell, but is also working with me on a DON method development project.	Brian is writing his senior honors thesis on the distribution of macronutrients in the Eastern Tropical South Pacific Ocean. Brian is headed to Stanford University for graduate studies in the fall of 2011.	Julie is a Univ. of Miami class of 2013 Marine Sciences/Chemistry double major (and math minor) who is measuring inorganic and organic nutrients in marine samples

Funding

University of Miami Provost Research Award, 2011, $17,000

Co-PI, 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

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

Publications

Knapp, A.N., D.M. Sigman, F. Lipschultz, A.B. Kustka, and D.G. Capone, 2011, Interbasin isotopic correspondence between upper-ocean bulk DON and subsurface nitrate and its implications for marine nitrogen cycling, Global Biogeochemical Cycles, 25, GB4004, doi:10.1029/2010GB003878

Collins, L.E., W. Berelson, D.E. Hammond, A. Knapp, R. Schwartz, and D. Capone, 2011, Particle fluxes in San Pedro Basin, California: A four-year record of sedimentation and physical forcing, Deep-Sea Research I, 58, 898-914.

Knapp, A.N., M.G. Hastings, D.M. Sigman, F. Lipschultz and J.N. Galloway, 2010, The flux and isotopic composition of reduced and total nitrogen in Bermuda rain, Marine Chemistry, 120, 83-89, doi:10.1016/j.marchem.2008.08.007 (Published online in final form in 2008)

Spencer, P.K., and A.N. Knapp, 2010, Sedimentology, New stratigraphic markers in the late Pleistocene Palouse loess: novel fossil gastropods, absolute age constraints, and non-eolian facies, 57, 41-52, 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., 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 Bermuda 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

2010 - Present; Research Assistant Professor, Marine and Atmospheric Chemistry, RSMAS, University of Miami

2009 - 2010 Postdoctoral researcher with Dennis Hansell, Marine and Atmospheric Chemsitry, RSMAS, University of Miami.

2006 - 2008 NOAA/UCAR Climate and Global Change Postdoctoral Fellow , hosted by (Doug Capone, Univ. of So. California, Marine and Env. 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

Stereotype Threat Resources

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

Panelist for NSF Chemical Oceanography and NOAA's Global Carbon Cycle; Referee for NSF, BSF, Moore Foundation, California Sea Grant, and MIT/Massachusetts Sea Grant proposals; Referee for Science, Global Biogeochemical Cycles, Limnology and Oceanography, Applied Geochemistry, Biogeosciences, Biogeochemistry, Geology, Marine Ecology and Progress Series, Nitrogen in the Marine Environment (book chapter), and Annals of Glaciology