Temperature and Secchi Disk Depth Increase More Rapidly in the Subpolar Bering/Okhotsk Seas Than in the Subtropical South China Sea
2022
Chen-Tung (Arthur) Chen | Shujie Yu | Ting-Hsuan Huang | Yan Bai | Xianqiang He | Hon-Kit Lui
Like other high-latitude seas, the subpolar Bering and Okhotsk Seas in the northernmost Pacific Ocean changed rapidly from 1998 to 2018. The sea surface temperature (SST) increased by 0.62 and 0.41 °:C/decade, respectively, much higher than the global rate of 0.108 °:C/decade from 2000 until 2015. Despite this rapid warming, the chlorophyll content did not change significantly in the Bering Sea but increased by 0.047 &mu:g/L/decade in the Okhotsk Sea. The Secchi disk depth (SDD) increased by 0.43 and 0.46 m/decade, respectively. Similar to other warm bodies of water, the SST of the subtropical/tropical South China Sea (SCS) also began rising, by 0.089 °:C/decade, albeit more slowly than the global average. The chlorophyll content increased at 0.15 &mu:g/L/decade from 1998 to 2006 but decreased by 0.11 &mu:g/L/decade between 2007 and 2018. The SDD increased by 0.29 m/decade between 1998 and 2018. Although the SDD increased in all three seas, the chlorophyll concentration was maximum around 2006&ndash:2009, reflecting different phytoplankton responses to seawater warming.
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