Siegel, D. A. UCSB,
, . A. ,
ORTHOGONAL VIEWS OF THE GLOBAL OCEAN BIOSPHERE USING SEAWIFS
Chlorophyll is not the only material capable of absorbing and scattering solar radiation. Detrital particulates, colored dissolved organic materials (CDOM) and suspended solids all can contribute to the shape and magnitude of the water-leaving radiance spectrum. Over the years, several semi-analytical ocean color algorithms have been developed to quantify these complicating factors. Here, we employ a semi-analytical algorithm to partition SeaWiFS ocean color imagery into optically relevant components for phytoplankton absorption, colored non-algal material absorption and particulate backscatter. The algorithm is tuned using a globally distributed data set (cf., SeaBAM) to perform optimally for the global ocean. Results show that the contribution of colored non-algal materials (cf., the sum of the CDOM and detrital particulate absorption coefficients) is a large and variable fraction of the total non-water absorption at 440 nm. The global distribution of the particulate backscatter to chlorophyll ratio is consistent with the known or presumed presence of several
highly reflective phytoplankton groups (cf., coccolithophores and trichodesmium). These results contradict the notion of a simple Case
I ocean where all properties covary with the chlorophyll concentration and an alternative paradigm is suggested.
Day: Tuesday, Feb. 2
Location: Sweeney Center