Publications

Shen, Chunyan; Shi, Ping; Zhao, Hui; Zhang, Yanying; Dong, Junde (2014). Spatio-temporal distribution of chlorophyll-a concentration derived from MODIS satellite remote-sensing and in situ observations in Sanya Bay, China. INTERNATIONAL JOURNAL OF REMOTE SENSING, 35(12-Nov), 4127-4137.

Abstract
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.

DOI:
10.1080/01431161.2014.916056

ISSN:
0143-1161; 1366-5901