Sasha Wagner

Assistant Professor, Earth and Environmental Sciences

My research interests broadly focus on the geochemistry of organic matter, a fundamental component of carbon and biogeochemical cycles. As part of this research, I specialize in the study of black carbon, the fire-derived portion of organic matter. In my lab, we use a variety of analytical and chemical techniques to decipher the molecular information contained within organic matter and to advance our understanding of aquatic biogeochemistry in the face of environmental change.

If you are interested in joining my lab or learning more about the research we do, please contact me at the email listed below.

Education

PhD in Environmental Chemistry, Florida International University, 2015

BS in Biochemistry, University of Delaware, 2009

Research Focus
  • organic geochemistry
  • biogeochemistry
  • environmental chemistry
  • dissolved organic matter
  • black carbon
Select Works
  • Podgorski, D.C., Zito, P., Kellerman, A.M., Bekins, B.A., Cozzarelli, I.M., Smith, D.F., Cao, X., Schmidt-Rohr, K., Wagner, S., Stubbins, A., Spencer, R.G.M. (2021) Hydrocarbons to carboxyl-rich alicyclic molecules: A continuum model to describe biodegradation of petroleum-derived dissolved organic matter in contaminated groundwater plumes. Journal of Hazardous Materials 402, 123998. doi.org/10.1016/j.jhazmat.2020.123998
  • Drake, T.W., Wagner, S., Stubbins, A., Wabakanghanzi, J.N., Dinga, J.B., Six, J., Spencer, R.G.M. (2020) Du feu à l’eau: source and flux of dissolved black carbon from the Congo River. Global Biogeochemical Cycles 34, e2020GB006560. doi.org/10.1029/2020GB006560
  • Wagner, S., Schubotz, F., Kaiser, K., Hallmann, C., Waska, H., Rossel, P.E., Hansman, R., Elvert, M., Middelburg, J.J., Engel, A., Blattmann, T.M., Catalá, T.S., Lennartz, S.T., Gomez-Saez, G.V., Pantoja-Gutiérrez, S., Bao, R., Galy, V. (2020) Soothsaying DOM: A current perspective on the future of oceanic dissolved organic carbon. Frontiers in Marine Science 7:341. doi.org/10.3389/fmars.2020.00341
  • Bisson, K., Baetge, N., Kramer, S.J., Catlett, D., Girling, G., McNair, H., Arrington, E., Hayes, D., Jacobs, C., James, A., Closset, A., Fischer, A.D., Wagner, S., Reading, M., Comstock, J., Amiri, S., Harvey, E., Carlson, C., Gaube, P., Drushka, K., Valentine, D.L. (2020) California wildfire burns boundaries between science and art. Oceanography 33:16–19. doi.org/10.5670/oceanog.2020.110
  • Wagner, S., Brantley, S., Stuber, S., Van Stan, S., Whitetree, A., Stubbins, A. (2019) Dissolved black carbon in throughfall and stemflow in a fire-managed longleaf pine woodland. Biogeochemistry 146:191–207. doi.org/10.1007/s10533-019-00620-2
  • Wagner, S., Brandes, J., Spencer, R.G.M., Ma, K., Rosengard, S.Z., Moura, J.M.S., Stubbins, A. (2019) Isotopic composition of oceanic dissolved black carbon reveals non-riverine source. Nature Communications 10:5064. doi.org/10.1038/s41467-019-13111-7
  • Wagner, S., Fair, J.H., Matt, S., Hosen, J., Raymond, P., Saiers, J., Shanley, J.B., Dittmar, T., Stubbins, A. (2019) Molecular hysteresis: Hydrologically driven changes in riverine dissolved organic matter chemistry during a storm event. Journal of Geophysical Research: Biogeosciences 123. doi.org/10.1029/2018JG004817
  • Wagner, S., Jaffé, R., Stubbins, A. (2018) Dissolved black carbon in aquatic ecosystems. Limnology and Oceanography: Letters doi: 10.1002/lol2.10076