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Corals Reveal an Unprecedented Decrease of Arabian Sea Upwelling During the Current Warming Era

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Title: Corals Reveal an Unprecedented Decrease of Arabian Sea Upwelling During the Current Warming Era
Authors: Watanabe, Takaaki K. Browse this author
Watanabe, Tsuyoshi Browse this author →KAKEN DB
Pfeiffer, Miriam Browse this author
Hu, Hsun-Ming Browse this author
Shen, Chuan-Chou Browse this author
Yamazaki, Atsuko Browse this author
Keywords: Arabian Sea
oxygen isotope
Issue Date: 28-May-2021
Publisher: American Geophysical Union
Journal Title: Geophysical research letters
Volume: 48
Issue: 10
Start Page: e2021GL092432
Publisher DOI: 10.1029/2021GL092432
Abstract: Upwelling in the Arabian Sea driven by the Indian summer monsoon pumps deep, cold, and eutrophic seawater to the sea surface every summer. The Indian summer monsoon and the Arabian Sea upwelling were expected to intensify with global warming, following the hypothesis that the Eurasian landmass would warm faster than the Indian Ocean. Contrary to expectations, the northern Indian Ocean currently warms faster than the Indian subcontinent. A weakening of the Indian summer monsoon circulation is reported, which possibly weakens the Arabian Sea upwelling. However, a lack of observations limits understanding of current and historical changes of the Arabian Sea upwelling. Here, we reconstruct the Arabian Sea upwelling over the past millennium using modern and fossil corals. Our coral records show that the Arabian Sea upwelling intensity was very stable over the last millennium and unprecedentedly declines at present. Our finding implies anthropogenic forcing likely weakens the Arabian Sea upwelling.
Rights: Copyright 2021 American Geophysical Union.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 渡邊 剛

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