Abstract
English
Highlights
The objective of this paper is to describe upwelling off Zamboanga Peninsula and to make use of satellite sea surface temperature (SST) and chlorophyll a distributions as proxies to determine interannual upwelling variability
Summary and Conclusions A major upwelling regime exists off the northern coast of Zamboanga Peninsula in the Philippine Archipelago
Upwelling is driven by northeast monsoon (NEM) winds, which are directed toward the southwest from December to March
Summary
Cooler temperatures and elevated chlorophyll a, indicative of upwelling, are observed off the coast of Zamboanga Peninsula, Philippines. This upwelling is driven primarily by offshore Ekman transport as the northeast monsoon winds blow parallel along the coast of Zamboanga, with enhancement of positive wind stress curl due to the land’s frictional retarding force. Despite the prevailing notion that La Niña causes strengthening of the monsoon-driven upwelling, long-term fisheries production data for Zamboanga demonstrate a decrease in fish catch due to weaker upwelling during the 1999/2000 and 2007/2008 La Niñas. Interannual variations in upwelling, phytoplankton productivity, and sardine catch suggest that interannual El Niño-Southern Oscillation variations can affect the small Zamboanga Peninsula pelagic fishery. Ocean circulation here is a result of complex interaction between the bathymetry, the seasonally reversing monsoons, and the tidal and nontidal circulation between the South China Sea and the western Pacific (Wang et al, 2008; Han et al, 2009; Gordon et al, 2011)
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