[Eoas-seminar] EOAS Colloquium, Friday, Oct. 11, 3:30 PM in CAR 101

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Tue Oct 8 10:48:51 EDT 2019

Hi all,

Please join us for our next speaker in the Fall EOAS Colloquium series, this Friday Oct. 11 at 3:30 in CAR 101.

Dr. Daniel Ohnemus, Skidaway Institute of Oceanography, University of Georgia

Title: Exposing “Latent” Scavenged Particulate Phases in the Oceans

Abstract: The last decade has seen a rapid increase in the number of high-resolution, multi-elemental datasets for particulate (and dissolved) concentrations in the oceans, largely through the work of the international GEOTRACES program. Our conceptual framework for marine trace element cycling, especially in the open ocean, often remains simplified as the production and remineralization of phytoplankton biomass. Many bioactive trace element cycles are primarily considered, often literally, an extension of traditional Redfield macronutrient ratios. The identities and internal behaviors of other authigenic (scavenged) phases that form in the oceans remain hidden within these multi-element datasets. In this talk I demonstrate how several statistical techniques—and a few visual ones—can reveal these latent phases in datasets from contrasting regions. We find that no bioactive element behaves identically to the macronutrient P, and that the cycles of many bioactive trace elements are dominated by strong, and potentially predictable, internal authigenic cycles.
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