Please join us for the following AOS Seminar Thursday, October 24 at 4:00pm in Spiess Hall 330:
Speaker: Jim Bishop, Professor Marine Geochemistry, UC Berkeley
Title: "Is Coastal Carbon Sedimentation Grossly Underestimated?"
The very fast and ~10 Pg C y-1 strong, ocean biological carbon pump plays a fundamental role in the global carbon cycle. Is it stable or changing? Since 2010 we have been working to develop autonomous methods to quantitatively measure particulate inorganic carbon (PIC) and particulate organic carbon (POC) concentration and flux profiles in the under-observed upper 1000 m with the aim of providing the baseline observations on a broad scale to inform models. Our cruises have frequently visited the 2000 m deep Santa Cruz Basin. On station, we have deployed transmissometer, birefringence, and scattering sensor equipped CTDs and profiling floats (a.k.a. Carbon Explorers), surface tethered optical sedimentation recorders (OSR) with sample collecting traps, and OSR outfitted floats (Carbon Flux Explorers, CFEs). Data from May 2011, 2012, and Jan and March 2013 are presented and analyzed within the context of remote sensing and physical data sets. The stunning finding from CFEs is that high particle sedimentation occurred when least expected. A second finding is that surface tethered sediment traps grossly under sampled sedimenting particles. Hence, the title of this talk.