The Coastal Transition Zone: Nutrient Distributions and Transformations Associated with Cool Filaments off Northern California
Final rept. 1 Mar 86-31 Mar 90,
UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF BIOLOGICAL SCIENCES
Pagination or Media Count:
The objective of this project was to determine the three dimensional distribution of phytoplankton and nutrients associated with cold filament and jet systems in the coastal transition zone. Distribution were determined with hydrographic grids, towyo mapping and nearsurface underway mapping during two cruises off northern California in July 1986 and July 1988. We have examined the relationship of nutrients and phytoplankton distributions with the physical processes of the system of water jets and eddies and the role of jets and filaments in the seaward flux of nutrients and phytoplankton from coastal regions. Results from this research indicate the seaward jets results in a significant net transport of phytoplankton offshore. Although these jets also have a large seaward transport of nutrients, the net offshore transport of nutrients may be a small proportion of the seaward transport due to associated shoreward flow. The jetfilament system also results in a net downward flux of phytoplankton as dense, coastally upwelled water is advanced seaward. Cyclonic eddies beyond the shelf break result in elevated nutrient concentrations within euphotic zones but not necessarily increased phytoplankton biomass.
- Biological Oceanography
- Physical and Dynamic Oceanography