HR: 1340h
AN: H53A-1217    [Abstracts]
TI: Draw-Down of Metals During a Spring Phytoplankton Bloom in South San Francisco Bay
AU: * Luengen, A C
EM: allisonl@ucsc.edu
AF: ETOX Department, UCSC, ETOX Department, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064 United States
AU: Flegal, A R
EM: flegal@etox.ucsc.edu
AF: ETOX Department, UCSC, ETOX Department, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064 United States
AB: This research measured concentrations of Co, Cu, Ni, Pb, and Zn during a South San Francisco Bay (South Bay) spring bloom to evaluate the role of phytoplankton in metal uptake and cycling. Water samples (dissolved and total) were collected using trace-metal clean techniques during 10 cruises at 3 sites in the South Bay channel. Vertical profiles of the water column were conducted by Jim Cloern's group from the United States Geological Survey. The spring 2003 bloom was a roughly 40 day period of high hytoplankton biomass when chlorophyll-a concentrations peaked at $>$150 $\mu$g/L at station 36 in the extreme South Bay. Principal Component Analysis was used to reduce the variables to 3 diagnostic factors that were then used to characterize processes governing the biogeochemical cycles of trace elements in the bay. These statistical analyses demonstrated that concentrations of some elements (e.g. Ni and Pb) were depleted during the spring bloom whereas others (e.g. Cu) were not. These results are consistent with other studies on the speciation and bioavailability of different trace elements in San Francisco Bay.
DE: 4805 Biogeochemical cycles (1615)
DE: 4875 Trace elements
DE: 4235 Estuarine processes
DE: 4251 Marine pollution
DE: 1803 Anthropogenic effects
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting