AOS Research Staff Profile
Gregory de Souza
Postdoctoral Research Fellow
Address: 310 Sayre Hall
Phone: (609) 258-0846
Email: gfds at princeton.edu
How does the interplay between ocean circulation and biological processes govern the cycling of nutrients in the sea?
As an isotope geochemist with a strong interest in global-scale ocean biogeochemistry, I use stable isotope tracers to study this interaction, in research that is funded by the Swiss National Science Foundation with support from the US National Oceanic and Atmospheric Administration.
A section through the southeastern Pacific Ocean at 103W, showing the propagation of the Si isotope signal of utilisation from the surface Southern Ocean far into the subtropics in the salinity minimum of SAMW/AAIW. These observations were published by de Souza et al. (2012) in Biogeosciences.
Publications and manuscripts in review
G. F. de Souza, R. D. Slater, J. P. Dunne and J. L. Sarmiento (in review), "Deconvolving the controls on the deep ocean's silicon stable isotope distribution" in review for Earth and Planetary Science Letters.
F. Wetzel, G. F. de Souza, and B. C. Reynolds (2014). "What controls silicon isotope fractionation during dissolution of diatom opal?", Geochimica et Cosmochimica Acta 131, 128-137, doi:10.1016/j.gca.2014.01.028.
G. F. de Souza, B. C. Reynolds, G. C. Johnson, J. L. Bullister, and B. Bourdon (2012). “Silicon stable isotope distribution traces Southern Ocean export of Si to the eastern South Pacific thermocline”, Biogeosciences 9, 4199-4213, doi:10.5194/bg-9-4199-2012.
C. Ehlert, P. Grasse, E. Mollier-Vogel, T. Boeschen, J. Franz, G. F. de Souza, B. C. Reynolds, L. Stramma and M. Frank (2012). "Factors controlling the silicon isotope distribution in waters and surface sediments of the Peruvian coastal upwelling", Geochimica et Cosmochimica Acta 99, 128-145, doi:10.1016/j.gca.2012.09.038.
G. F. de Souza, B. C. Reynolds, J. Rickli, M. Frank, M. Saito, L. J. A. Gerringa, and B. Bourdon (2012). “Southern Ocean control of silicon stable isotope distribution in the deep Atlantic Ocean”, Global Biogeochemical Cycles 26, GB2035, doi:10.1029/2011GB004141.
G. F. de Souza, B. C. Reynolds, M. Kiczka, and B. Bourdon (2010). Evidence for mass-dependent isotopic fractionation of strontium in a glaciated granitic watershed. Geochimica et Cosmochimica Acta 74 (9), 2596-2614, doi:10.1016/j.gca.2010.02.012.
J. Rickli, M. Frank, A. R. Baker, S. Aciego, G. de Souza, R. B. Georg, and A. N. Halliday (2010). Hafnium and neodymium isotopes in surface waters of the eastern Atlantic Ocean: Implications for sources and inputs of trace metals to the ocean. Geochimica et Cosmochimica Acta 74 (2), 540-557, doi:10.1016/j.gca.2009.10.006.
Ph. D. Thesis
G. F. de Souza (2011): The marine biogeochemical cycle of silicon: insights from silicon stable isotopes, doi: 10.3929/ethz-a-006696232, ETH Zurich