Physics – Atmospheric and Oceanic Physics
Scientific paper
2010-04-14
MARINE ECOLOGY PROGRESS SERIES Vol. 404: 39-50, 2010
Physics
Atmospheric and Oceanic Physics
Typhoon-Ocean Environment interactions
Scientific paper
10.3354/meps08477
Recent studies demonstrate that chlorophyll a (chl a) concentrations in the surface ocean can be significantly enhanced due to typhoons. The present study investigated chl a concentrations in the middle of the South China Sea (SCS) from 1997-2007. Only the Category1 (minimal) Typhoon Hagibis (2007) had a notable effect on the chl a concentrations. Typhoon Hagibis had a strong upwelling potential due to its location near the equator, and the forcing time of the typhoon (>82 h) was much longer than the geostrophic adjustment time (~63 h). The higher upwelling velocity and the longer forcing time increased the depth of the mixed-layer, which consequently induced a strong phytoplankton bloom that accounted for about 30% of the total annual chl a concentration in the middle of the SCS. The implication is that the forcing time of a typhoon should be long enough to establish a strong upwelling and consequently for the induction of significant upper ocean responses.
Fu Yun-Fei
Lu Zhu-min
Sun Liang
Xian Tao
Yang Yuan-Jian
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