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Are the trends in the surface chlorophyll opposite between the South China Sea and the Bay of Bengal?

Recent studies have suggested the length of the satellite records is too short to separate interannual and multidecadal cycles from climate trends. Therefore, the traditional method to assume trend being a straight line over the whole length of a time series is not suitable to reveal the actual trend of satellite Chlorophyll a concentration (Chla) records which length is less than 20 years. From the monotonic trend analysis, the significant increasing trend (P<0.05) in the central and southern South China Sea (SCS) and significant decreasing trend (P<0.05) in the Bay of Bengal (BoB) were detected. However, a time-varying trend in the surface chlorophyll between the SCS and BoB was obtained by exploring an Ensemble Empirical Mode Decomposition (EEMD) method in our study. Our analysis of the long term merged Chla time series from GlobColour over the time period from September 1997 to December 2011 revealed a change of trend for the central BoB before and after 2003; Chla was indeed increasing till 2003 but began to be declining since then. For the southern SCS, Chla was increasing till 2004 and appeared to decrease since then. In the southern BoB and the central SCS, the trends seemed to be almost linear and always decreased or increased during the study period. The results indicate that the warming SST makes a contribution to the decrease of the chlorophyll while the cooling SST leads to the increase of the chlorophyll in both the southern BoB and southern SCS. However, the wind may contribute a little to the trend of chlorophyll.