Variation of Phytoplankton Absorption Coefficients in the Northern South China Sea during Spring and Autumn
NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
Pagination or Media Count:
We examined the temporal and spatial variabilities of phytoplankton absorption coefficients alpha sub ph lambda and their relationships with physical processes in the northern South China Sea from two cruise surveys during spring May 2001 and late autumn November 2002. A large river plume induced by heavy precipitation iii May stimulated a phytoplankton bloom on the inner shelf, causing significant changes in the surface water in alpha sub ph, values and BR ratios Alpha sub ph lambdaalpha sub ph440alpha sub ph 675. This was consistent with the observed one order of magnitude elevation of chlorophyll alpha and a shift from a piconano dominated phytoplankton community to one dominated by micro-algae. At the seasonal level, enhanced vertical mixing due to strengthened northeast monsoon in November has been observed to result in higher surface alphasub ph675 0.002-0.006 mexp -1exp -1 higher.
- Physical and Dynamic Oceanography