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Cross-shelf overturning in geostrophic-stress-dominant coastal fronts
| 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 | | Front | | 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 |
| URI: | http://hdl.handle.net/2115/87130 |
| 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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