The near-inertial waves observed east of the Philippines

Shengming YUAN; Xiaomei YAN; Linlin ZHANG; Bing YANG; Chongguang PANG; Dunxin HU

doi:10.1007/s00343-021-1180-0

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The near-inertial waves observed east of the Philippines

Physics | Updated：2023-05-19

- The near-inertial waves observed east of the Philippines
- Journal of Oceanology and Limnology Vol. 40, Issue 5, Pages: 1889-1908(2022)
- Affiliations：
  
  1.Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
  2.Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
  3.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
  4.College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China
- Author bio：
  
  Xiaomei YAN,yanxiaomei@qdio.ac.cn
  Linlin ZHANG,zhanglinlin@qdio.ac.cn
- Funds：
- DOI：10.1007/s00343-021-1180-0
  CLC：
- Received：10 June 2021，
  
  Accepted：18 August 2021，
  
  Online First：15 November 2021，
  
  Published：2022-09
- Accepted：
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Shengming YUAN, Xiaomei YAN, Linlin ZHANG, et al. The near-inertial waves observed east of the Philippines[J]. Journal of Oceanology and Limnology, 2022, 40(5): 1889-1908.
DOI：

Shengming YUAN, Xiaomei YAN, Linlin ZHANG, et al. The near-inertial waves observed east of the Philippines[J]. Journal of Oceanology and Limnology, 2022, 40(5): 1889-1908. DOI： 10.1007/s00343-021-1180-0.

摘要

Abstract

Based on mooring observations from Aug. 1

2016 to Dec. 14

2017

the characteristics and underlying mechanisms of near-inertial waves (NIWs) observed east of the Philippines were studied. Three strong NIW events were investigated in detail. The NIWs in Event Ⅰ were induced by typhoon Lan and had the strongest magnitudes of 0.35 m/s. The maximum near-inertial kinetic energy (NIKE) was shown at the ocean surface. The NIW in Event Ⅱ was stimulated by a moderate cyclonic wind with the extreme NIKE located at about 110-m depth. The existence of a cyclonic eddy during Events Ⅰ and Ⅱ led to a blue shift of near-inertial frequencies. For Event Ⅲ

the surface near-inertial signals were also induced by local weak wind

whereas the real generation mechanisms for the subsurface NIWs remain unclear. In particular

during Event Ⅲ

there was a nonlinear wave-wave interaction between NIWs and semidiurnal (D2) tides

which further induced strong D2±

waves. Overall

the NIWs in the three events exhibited distinct vertical structures. The NIWs in Events Ⅰ and Ⅱ were dominated by lower modes with elevated NIKE well confined to the upper 250 m and 270 m

respectively. In contrast

the NIW Event Ⅲ was dominated by higher modes and the NIWs penetrated downward beyond 360 m. Such deep penetration of NIWs could be attributed to the weak wind stress curl and positive sea level anomalies associated with an anticyclonic eddy. In addition

the three NIW events had

-folding timescales of less than 7 days.

关键词

Keywords

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