HR: 17:45h
AN: OS34A-08    [Abstracts]
TI: Temporal and Depth Trends in Phosphorus and Carbon Forms in Ocean Particulates from Monterey Bay, California
AU: * Cade-Menun, B J
EM: bjcm@pangea.stanford.edu
AF: Stanford University, GES Dept, Bldg 320, Rm 118, Stanford, CA 94305-2115 United States
AU: Paytan, A
EM: apaytan@pangea.stanford.edu
AF: Stanford University, GES Dept, Bldg 320, Rm 118, Stanford, CA 94305-2115 United States
AB: The sinking of particulate organic matter (POM) is a major mechanism by which carbon (C) and phosphorus (P) are transported to depth from the ocean surface. Forms of C and P will change with depth, due to remineralization, and should vary with time. Understanding the temporal and depth trends in P and C concentration and forms is crucial if we are to understand their bioavailability and their role in marine productivity. Using 31P and 13C nuclear magnetic resonance (NMR) spectroscopy, isotope analysis, SEDEX fractionation, enzymatic hydrolysis and other techniques, we characterized C and P forms in samples collected from Monterey Bay, CA. Samples included plankton tows collected during two major bloom events, sediment trap samples collected at 200 m and 1200 m biweekly for 6 months, and sediment samples. Carbon forms showed little variation with depth but strong temporal variations, particularly for lipids. Phosphorus forms varied both with time and depth. Inositol phosphates were the primary organic P form in the surface but decreased with depth, while phosphonates showed the most temporal variation.
DE: 4806 Carbon cycling (0428)
DE: 4807 Chemical speciation and complexation
DE: 4845 Nutrients and nutrient cycling (0470, 1050)
DE: 4850 Marine organic chemistry (0470, 1050)
SC: Ocean Sciences [OS]
MN: Fall Meeting 2005