Near-inertial waves advected by the Kuroshio from observation and simulation

Title
Near-inertial waves advected by the Kuroshio from observation and simulation
Author(s)
전찬형; 박재훈; Hirohiko Nakamura; Ayako Nishina; Xiao-Hua Zhu; 김동국; 민홍식; 강석구; 나한나; Naoki Hirose
KIOST Author(s)
Kim, Dong Guk(김동국)
Publication Year
2018-05-24
Abstract
Advection of near-inertial waves (NIWs) by background currents has been predicted using numerical simulations, while supporting in-situ observations were rare. A pair of tall current moorings, deployed around 26°N and 125°E in Okinawa Trough from June 2015 to June 2016, provides a clear evidence exhibiting NIWs advected by the Kuroshio. Energetic NIWs are observed after tow-typhoon passages in early August and late September 2015. Both typhoon passages occurred across theKuroshio east of Taiwan upstream of the observation sites about 250 km southwestward with a difference of about 2-degree in latitude. One site (KCM1), relatively close to the center of the Kuroshio axis, exhibits more energetic NIWs than near the edge of the Kuroshio (KCM2), ~40 km away from KCM1. The frequency of NIWs is shifted to the lower band from the local inertial frequency (0.91f), inferring propagation from the south. A data-assimilation three-dimensional numerical model simulates that local NIW generation is weak at observation sites during and after typhoon passages, while its generation in the Kuroshio upstream is energetic. In addition, the model simulates patterns and characteristics of the advection NIWs consistent with the observations, strongly supporting that the observed features of NIWs are caused by their advection to the northeastward by the Kuroshio.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/23318
Bibliographic Citation
2018년 한국해양과학기술협의회 공동학술대회, pp.304, 2018
Publisher
한국해양과학기술협의회
Type
Conference
Language
Korean
Publisher
한국해양과학기술협의회
Related Researcher
Research Interests

ocean observation,ocean circulation,climate change,해양조사,해양순환,기후변화

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