Satellites reveal hot spots of ocean changes in the early 21st century.

Analyzing the trend component of the global time-series data, we discover that only a limited portion of the global sea area exhibits a notable trend in water color ( Fig. 2A , black contours denote confidence intervals at 90% level).

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Water color tends to be lighter with high Chla concentrations, and the trend of Chla with α* varies across three intervals, generally following a decreasing trend [coefficient of determination ( R 2 ) = 0.59] ( Fig. 6 ).

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