Abstract
This chapter reviews interdecadal variations of the Oyashio from the 1960s to the 2010s and the impacts of the Oyashio on coastal waters with a focus on the Extreme Cold Water Events (ECWEs) that occur during winter–spring near the Japanese coast adjacent to the Oyashio. The southernmost latitude of the First Oyashio Intrusion migrated southward in response to the basin-scale wind stress from the mid-1960s to the mid-1980s, while it changed less interdecadally from the mid-1990 to the mid-2010s. For the latter period, the Oyashio transport/velocity, including the intensity of the Western Subarctic Gyre, decreased interdecadally. Representative ECWEs occurred during winter–spring in 1963, 1974, 1981, 1984, 2006, and 2014. These ECWEs occurred under different conditions during the two periods; the ECWEs in 1963, 1974, 1981, and 1984 were accompanied by extreme southward intrusions of the Oyashio, whereas the ECWEs in 2006 and 2014 were not. The ECWEs in 2006, 2014, 1974, and 1984 occurred concomitantly with an extreme intensification of wind-induced circulation in the Okhotsk Sea that lasted a few months. Hence, the ECWEs could be caused by either or both of extreme southward intrusion of the Oyashio and extreme intensification of wind-induced circulation in the Okhotsk Sea.
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- 1.
One Sv = 106 m3 s−1.
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Acknowledgments
This work was supported by a Grant-in-Aid for Scientific Research KAKENHI (A) (17H00775) from the Japan Society for the Promotion of Science. We would like to thank editors, Dr. Chen-Tung Arthur and Dr. Guo Xinyu for giving us opportunity of summarizing this manuscript. Thanks are extended to reviewers for many constructive comments.
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Kuroda, H., Toya, Y., Kakehi, S., Setou, T. (2020). Interdecadal Variations of the Oyashio and Extreme Cold Water Events Near the Japanese Coast from the 1960s to the 2010s. In: Chen, CT., Guo, X. (eds) Changing Asia-Pacific Marginal Seas. Atmosphere, Earth, Ocean & Space. Springer, Singapore. https://doi.org/10.1007/978-981-15-4886-4_13
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