Poleward-propagating near-inertial waves enabled by the western boundary current SCIE SCOPUS

Cited 8 time in WEB OF SCIENCE Cited 10 time in Scopus
Title
Poleward-propagating near-inertial waves enabled by the western boundary current
Author(s)
Jeon, Chanhyung; Park, Jae-Hun; Nakamura, Hirohiko; Nishina, Ayako; Zhu, Xiao-Hua; Kim, Dong Guk; Min, Hong Sik; Kang, Sok Kuh; Na, Hanna; Hirose, Naoki
KIOST Author(s)
Kim, Dong Guk(김동국)Kang, Sok Kuh(강석구)
Alternative Author(s)
김동국; 민홍식; 강석구
Publication Year
2019-07-09
Abstract
Near-inertial waves (NIWs), which have clockwise (anticlockwise) rotational motion in the Northern (Southern) Hemisphere, exist everywhere in the ocean except at the equator; their frequencies are largely determined by the local inertial frequency, f. It is thought that they supply about 25% of the energy for global ocean mixing through turbulence resulting from their strong current shear and breaking; this contributes mainly to upper-ocean mixing which is related to air-sea interaction, typhoon genesis, marine ecosystem, carbon cycle, and climate change. Observations and numerical simulations have shown that the low-mode NIWs can travel many hundreds of kilometres from a source region toward the equator because the lower inertial frequency at lower latitudes allows their free propagation. Here, using observations and a numerical simulation, we demonstrate poleward propagation of typhoon-induced NIWs by a western boundary current, the Kuroshio. Negative relative vorticity, meaning anticyclonic rotational tendency opposite to the Earth's spin, existing along the right-hand side of the Kuroshio path, makes the local inertial frequency shift to a lower value, thereby trapping the waves. This negative vorticity region works like a waveguide for NIW propagation, and the strong Kuroshio current advects the waves poleward with a speed similar to 85% of the local current. This finding emphasizes that background currents such as the Kuroshio and the Gulf Stream play a significant role in redistribution of the NIW energy available for global ocean mixing.
ISSN
2045-2322
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/566
DOI
10.1038/s41598-019-46364-9
Bibliographic Citation
SCIENTIFIC REPORTS, v.9, 2019
Publisher
NATURE PUBLISHING GROUP
Subject
OCEAN; OSCILLATIONS
Type
Article
Language
English
Document Type
Article
Publisher
NATURE PUBLISHING GROUP
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