HR: 14:45h
AN: OS52I-04    [PDF]
TI: The Dependence of Biological Productivity in Coastal Upwelling Systems on Daily Scale Temporal Variability in Winds
AU: * Botsford, L W
EM: lwbotsford@ucdavis.edu
AF: University of Califoria, Davis, 1 Shields Ave., Davis, CA 95616 United States
AU: Lawrence, C A
AF: University of Califoria, Davis, 1 Shields Ave., Davis, CA 95616 United States
AU: Dever, E P
AF: Scripps Institution of Oceanography, UCSD 9500 Gilman Drive, La Jolla, CA 92093-0209 United States
AU: Hastings, A
AF: University of Califoria, Davis, 1 Shields Ave., Davis, CA 95616 United States
AU: Largier, J
AF: Scripps Institution of Oceanography, UCSD 9500 Gilman Drive, La Jolla, CA 92093-0209 United States
AB: Coastal winds lead to greater biological productivity on shelves of eastern boundary currents due to upwelled nutrients. Howev er, the facts that (1) very high winds can transport upwelled water off the shelf before the potential primary or secondary productivity is realized, and (2) winds occasionally decline to zero or reverse lead to a complex dependence of production on daily time scale temporal variability in the wind. We first present a simple, idealized physical model that brings parcels to the surface and transports them across the shelf in response to upwelling winds and show how productivity depends on varying levels of constant winds for different NPZ models representing different trophic pathways. We then show how productivity depends onvariable winds. We compare levels of annual productivity estimated from an upwelling index to those estimated from upwelling and uptake due to primary and secondary productivity, using buoy wind data from NDBC13 offshore of Bodega Bay, CA for the years 1981 to 2003. Accounting for uptake, especially that due to secondary productivity, leads to a substantially different view of the dependence of biological productivity on wind.
DE: 4215 Climate and interannual variability (3309)
DE: 4279 Upwelling and convergences
DE: 4842 Modeling
SC: Ocean Sciences [OS]
MN: 2004 Ocean Sciences Meeting