Cite this paper:
HU Shijian, LIU Lingling, GUAN Cong, ZHANG Linlin, WANG Jianing, WANG Qingye, MA Jie, WANG Fujun, JIA Fan, FENG Junqiao, LU Xi, WANG Fan, HU Dunxin. Dynamic features of near-inertial oscillations in the Northwestern Pacific derived from mooring observations from 2015 to 2018[J]. Journal of Oceanology and Limnology, 2020, 38(4): 1092-1107

Dynamic features of near-inertial oscillations in the Northwestern Pacific derived from mooring observations from 2015 to 2018

HU Shijian1,2,3,4, LIU Lingling1,2,3,4, GUAN Cong1,2,3,4, ZHANG Linlin1,2,3,4, WANG Jianing1,2,3,4, WANG Qingye1,2,3,4, MA Jie1,2,3,4, WANG Fujun1,2,3,4, JIA Fan1,2,3,4, FENG Junqiao1,2,3,4, LU Xi1,2,3,4, WANG Fan1,2,3,4, HU Dunxin1,2,3,4
1 CAS Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2 Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China;
3 Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China;
4 College of Marine Science, University of Chinese Academy of Sciences, Qingdao 266071, China
Near-inertial oscillation is an important physical process transferring surface wind energy into deep ocean. We investigated the near-inertial kinetic energy (NIKE) variability using acoustic Doppler current profiler measurements from a mooring array deployed in the tropical western Pacific Ocean along 130°E at 8.5°N, 11°N, 12.6°N, 15°N, and 17.5°N from September 2015 to January 2018. Spatial features, decay timescales, and significant seasonal variability of the observed NIKE were described. At the mooring sites of 17.5°N, 15°N, and 12.6°N, the NIKE peaks occurred in boreal autumn and the NIKE troughs were observed in boreal spring. By contrast, the NIKE at 11°N and 8.5°N showed peaks in winter and troughs in summer. Tropical cyclones and strong wind events played an important role in the emergence of high-NIKE events and explained the seasonality and latitudinal characteristics of the observed NIKE.
Key words:    near-inertial kinetic energy|western Pacific Ocean|tropical cyclones|mooring array|seasonal variability   
Received: 2019-12-23   Revised: 2020-01-09
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