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Cross-shelf overturning in geostrophic-stress-dominant coastal fronts

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Title: Cross-shelf overturning in geostrophic-stress-dominant coastal fronts
Authors: Yuan, Nan Browse this author
Mitsudera, Humio Browse this author →KAKEN DB
Keywords: Coastal mixing
Downwelling-favorable wind
Reverse Ekman overturning
Issue Date: 21-Sep-2022
Publisher: Springer
Journal Title: Journal of oceanography
Publisher DOI: 10.1007/s10872-022-00661-6
Abstract: Compared to the dynamics of the predominantly geostrophic along-shelf current, our understanding of the cross-shelf dynamics in the Sea of Okhotsk is inadequate despite their importance in water mixing and nutrient entrainment. We investigated the cross-shelf overturning circulation along the East Sakhalin Current, which is a source of nutrients such as iron for the western North Pacific. Here, we reveal that the cross-shelf circulation during winter is characterised by a nearshore upwelling and a shelf-break downwelling under a downwelling-favourable monsoon wind, contrary to a classical Ekman overturning (EOT). This reverse EOT is driven by the internal water stress, which is caused by intensive vertical mixing and geostrophic vertical shear in the shelf-break front produced by riverine discharges from the far-eastern Eurasian Continent. The EOT blocks the Ekman onshore transport from the open ocean, thereby producing a deep mixed layer at the shelf break. Scaling analyses indicate the applicability of this mechanism to various other shelf-break fronts.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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