SCRIPPS INSTITUTION OF OCEANOGRAPHY FACULTY CANDIDATE SEMINAR: Marine Biogeochemistry
DATE: April 9th, Monday, 1:00 p.m.
LOCATION: Eckart Lecture Hall
TITLE: Utilizing biogeochemical profiling floats to understand air-sea fluxes of oxygen and carbon
In recent years, the deployment of profiling floats equipped with biogeochemical sensors has greatly expanded the temporal and spatial resolution of measurements relevant to the global carbon and oxygen cycles. Measurement of oxygen by profiling floats now greatly exceeds the number of measurements made on research vessels. With recent improvements in calibration and air-sea flux parameterizations we can now calculate air-sea oxygen fluxes with sufficient accuracy to determine estimates of the annual export of organic carbon from the surface ocean, one of the primary controls on oceanic uptake of carbon dioxide. Furthermore, through floats deployed as part of the Southern Ocean Carbon and Climate Observations and Modeling project and a recent data reanalysis, we have calculated the first basin scale estimates of oxygen fluxes in the Southern Ocean from direct measurements, finding an oceanic uptake that is nearly double prior estimates. I will also describe different approaches for using large-scale air-sea oxygen fluxes in the Southern Ocean and the Kuroshio Extension to understand the biological and physical processes in these regions. Finally, I will outline on-going work to use the increasing numbers of biogeochemical measurements from floats to constrain both data and model-based estimates of air-sea carbon fluxes.