Satellite-derived measurements of spatial and temporal chlorophyll-a
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- 作者：I. Nyoman Radiarta ; Sei-Ichi Saitoh
- 关键词：chlorophyll-a ; SeaWiFS ; suspended sediment ; wind ; EOF ; Funka Bay
- 刊名：Estuarine, Coastal and Shelf Science
- 出版年：2008
- 出版时间：10 September 2008
- 年：2008
- 卷：79
- 期：3
- 页码：400-408
- 全文大小：1746 K
文摘
Chlorophyll-a (chl-a) concentration has an important economic effect in coastal and marine environments on fisheries resources and marine aquaculture development. Monthly climatologies the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) derived chl-a from February 1998 to August 2004 around Funka Bay were used to investigate the spatial and temporal variability of chl-a concentrations. SeaWiFS-derived suspended sediment, MODIS derived sea surface temperature (SST), solar radiation and wind data were also analyzed. Results showed two distinct chlorophyll blooms in spring and autumn. Chl-a concentrations were relatively low (<0.3 mg m−3) in the bay during summer, with high concentrations occurring along the coast, particularly near Yakumo and Shiraoi. In spring, chl-a concentrations increased, and a large (>2 mg m−3) phytoplankton bloom occurred. The spatial and temporal patterns were further confirmed by empirical orthogonal function (EOF) analysis. About 83.94 % of the variability could be explained by the first three modes. The first chl-a mode (77.93 % of the total variance) explained the general seasonal cycle and quantified interannual variability in the bay. The spring condition was explained by the second mode (3.89 % of the total variance), while the third mode (2.12 % of the total variance) was associated with autumn condition. Local forcing such as the timing of intrusion of Oyashio water, wind condition and surface heating are the mechanisms that controlled the spatial and temporal variations of chlorophyll concentrations. Moreover, the variation of chlorophyll concentration along the coast seemed to be influenced by suspended sediment caused by resuspension or river discharge.