Comparisons of chlorophyll variability between the four major global eastern boundary currents
Abstract:The first two years of SeaWiFS (Sea viewing Wide Field of view Sensor) data (1997-1999) are used to document the variability of large-scale surface chlorophyll patterns within the coastal region along the full latitudinal extent of each of the four major global eastern boundary currents; the California, Humboldt, Benguela and Canary Currents. Seasonal chlorophyll patterns are compared to coincident seasonal cycles of Ekman transport calculated from satellite scatterometer data. In all four regions, maximum chlorophyll concentrations are generally temporally and latitudinally coincident with the seasonal maximum in upwelling (offshore Ekman transport) over most of their latitudinal range, but exceptions are documented. Interannual differences are evident in each region, most notably in the two Pacific regions where the 1997-1998 chlorophyll seasonality was affected by El Niño conditions. Significant differences between previously published chlorophyll seasonality deduced from the relatively sparse coverage of the Coastal Zone Color Scanner (CZCS) and the more complete coverage of SeaWiFS in both Southern Hemisphere regions are evident.
Document Type: Research Article
Affiliations: 1: School of Marine Sciences University of Maine Orono Maine 04469-5741 USA 2: College of Oceanic and Atmospheric Sciences Oregon State University Corvallis Oregon 97331-5503 USA 3: Jet Propulsion Laboratory California Institute of Technology MS 300-323, 4800 Oak Grove Dr Pasadena CA 91009-8099 USA
Publication date: April 1, 2004