This study examined satellite chlorophyll-a (chl-a) concentration and in situ observations in Sanya Bay (SYB). in situ observation of chl-a was conducted four times per year at 12 sampling stations in SYB from January 2004 to October 2008. Monthly
satellite chl-a was derived from the Moderate Resolution Imaging Spectroradiometer (MODIS) during 2000–2012. This study compared satellite chl-a values to in situ measurements in SYB. The two data sets match well in the whole region except for two estuaries. Results
show that the average in situ chl-a was 1.49 mg m−
3 in SYB. Chl-a was relatively higher (>2 mg m−3) and more variable in coastal areas, with a tendency to decrease offshore (<0.4 mg m−3).
The chl-a level in summer displayed obviously vertical stratification, with higher values at the bottom and lower values at the surface. Analysis of monthly mean chl-a showed that the highest level (>2 mg m−3) appeared in December, with the lowest
in March (<1 mg m−3). The gradients are ranked winter, autumn, summer and spring. There was higher chl-a in autumn and winter, which may be associated with the stronger wind monsoon then. Annual mean chl-a from 2000 to 2012 varied from 1.17 to 2.05 mg m−3,
with the minimum in 2001 and the maximum in 2005. The chl-a level presented a roughly increasing tendency from 2000 to 2012, which may be related to the increasing nutrients associated with the development of tourism and fishery.
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Document Type: Research Article
State Key Laboratory of Tropical Oceanograghy, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China
College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang, 524088, China
June 18, 2014
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