SBS Wraps up its 4th Year

The Department of Marine Sciences and ECOGIG have wrapped up our 4th year of the Southeastern Biogeochemistry Symposium this past weekend. This 2-day weekend 150-200-person symposium was modeled after the highly successful Southern California Geobiology Symposium. It also revived a similar symposium started by former Georgia Tech faculty members Don Canfield and Phillipe van Cappellen in the 1990s.

Doctoral student Sydney Plummer receives a prestigious NSF graduate fellowship

Sydney Plummer has been awarded an NSF graduate fellowship to investigate the ecophysiological roles of phytoplankton-derived reactive oxygen species.

The fellowship of the National Science Foundation will allow her to advance the current understanding of factors that underlie the structure and productivity of marine microbial communities, coupled biogeochemical cycles of carbon, nutrients, and metals, and thereby provide implications for marine ecosystem health and climate. 

Department of Marine Science Professor and PhD student travel to Florida Keys to study coral reefs

PhD Student Dan Owen and his advisor, Brian Hopkinson, travelled to the Florida Keys over winter break to study photosynthetic rates on coral reefs. Coral reefs are highly productive, but exactly how productive and which organisms are responsible for the primary production are subjects of ongoing research. Dan is studying the photosynthetic rates of corals, algae, and other primary producers on reefs in the Florida Keys. This fantastic work will help us to better understand the fragile ecosystems within and surrounding coral reefs.

 

Ph.D. student Maria Letourneau at the ASLO Meeting

M. Letourneau at ASLO

Maria Letourneau, a Ph.D. student working with Dr. Patricia Medeiros, presented the first results of their research on the GA coast at the 2017 ASLO Meeting in Hawaii. The poster entitled “The influence of hydrology on dissolved organic matter composition and degradation in the Altamaha River and Estuary” attracted the attention of other young scientists working on similar questions and approaches.

Estimating diapycnal mixing in the ocean: How close are we?

Mixing by turbulent motions in the ocean is important for global ocean circulation, nutrient supply to surface waters, and the global ocean heat budget. Turbulent mixing takes the form of a diffusive process where the vertical flux is proportional to the concentration gradient with an eddy diffusivity coefficient, Kz, as a constant of proportionality. Osborn (1980) suggested that Kz is in turn related to the flux Richardson number (Rif) or mixing efficiency (G) that is commonly assumed to be a constant value of 0.2.

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