Changes in Temperature, Chlorophyll Concentration, and Secchi Disk Depth in the Okhotsk Sea from 1998 to 2016
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The Okhotsk Sea is located in a subarctic zone with characteristics such as ice cover in winter. Like other high-latitude seas, the Okhotsk Sea is undergoing rapid changes. Notably, its sea surface temperature (SST) increased by about 4.5 °C/century between 1998 and 2016, exceeding the reported rate of increase of 1.3 °C/century between 1982 and 2006. During the same period (1998–2016), the chlorophyll concentration increased by 0.01 μg/L (0.99%) annually. The Secchi disk depth (SDD) slightly increased at 0.018 m/yr. These changes in the SST, chlorophyll concentration and Secchi disk depth lead to reduced oxygen content, and may affect other physical and biological processes as well as carbon sequestration in the Okhotsk Sea.
KeywordsOkhotsk Sea Sea surface temperature Chlorophyll concentration Secchi disk depth Temporal changes
The authors would like to thank the Ministry of Science and Technology of the Republic of China, Taiwan, for financially supporting this research under contract MOST 107-2611-M-110-006, 107-2611-M-110-021 and 107-2611-M-110-012 and the Ministry of Education (Higher Education Sprout Program) of Republic of China. Two anonymous reviewers provided constructive comments which strengthened the manuscript.
- Andreev AG, Bychkov AS, Zhabin IA (1999) Excess CO2 penetration in the Okhotsk Sea. In: 2nd international symposium on CO2 in the oceans, extended abstract, Tsukuba, 18–22 January 1999, pp 279–288Google Scholar
- Chen CTA, Tsunogai S (1998) Carbon and nutrients in the ocean. In: Galloway N, Melillo JM (eds) Asia change in the context of global climate change. Cambridge University Press, pp 271–307Google Scholar
- Chen CTA, Andreev A, Kim KR, Yamamoto M (2004) Roles of continental shelves and marginal seas in the biogeochemical cycles of the North Pacific Ocean. J Oceanogr 60(1):17–44. https://doi.org/10.1023/B:JOCE.0000038316.56018.d4CrossRefGoogle Scholar
- Chen CTA, Yu SJ, Huang TH, Bai Y, He XQ (2020a) Changes in temperature, chlorophyll concentration, and Secchi disk depth in the Bering Sea from 1998 to 2016. In: Chen CTA, Guo XY (eds) Changing Asia-Pacific marginal seas. Springer International Publishing (in press)Google Scholar
- Chen CTA, Yu SJ, Huang TH, Lui HK, Bai Y, He XQ (2020b) Changing biogeochemistry in the South China Sea. In: Chen CTA, Guo XY (eds) Changing Asia-Pacific Marginal Seas. Springer International Publishing (in press)Google Scholar
- Fei ZL (1986) Study on the water color and transparency in the Bohai Sea. J Oceanogr Huanghai Bohai Sea 2:26–29 (in Chinese with English abstract)Google Scholar
- Nakanowatari T, Mitsudera H (2020) Long-term trend and interannual to decadal variability in the Sea of Okhotsk. In: Chen CTA, Guo XY (eds) Changing Asia-Pacific marginal seas. Springer International Publishing (in press)Google Scholar
- Wakita M, Watanabe YW, Watanabe S, Noriki S, Wakatsuchi M (2003) Oceanic uptake rate of anthropogenic CO2 in a subpolar marginal sea: The Sea of Okhotsk. Geophys Res Lett 30(24):2252. https://doi.org/10.1029/2003GL018057
- Watanabe T, Wakatsuchi M (1998) Formation of 26.8-26.9 σθ water in the Kuril Basin of the Sea of Okhotsk as a possible origin of North Pacific Intermediate Water. J Geophys Res 103 (C2):2849–2865. https://doi.org/10.1029/97jc02914
- Wong CS, Matear RJ, Freeland HJ, Whitney FA, Bychkov AS (1998) WOCE line P1W in the Sea of Okhotsk: 2. CFCs and the formation rate of intermediate water. J Geophys Res 103(C8):15625– 15642. https://doi.org/10.1029/98jc01008
- Yamamoto-Kawai M, Watanabe S, Tsunogai S, Wakatsuchi M (2004) Chlorofluorocarbons in the Sea of Okhotsk: Ventilation of the intermediate water. J Geophys Res 109:C09S11. https://doi.org/10.1029/2003jc001919