IOCAS-IR  > 海洋环流与波动重点实验室
Observation of Near-Inertial Oscillations Induced by Energy Transformation during Typhoons
Hou, Huaqian1,2; Yu, Fei1; Nan, Feng1; Yang, Bing1; Guan, Shoude1; Zhang, Yuanzhi3
2019
Source PublicationENERGIES
ISSN1996-1073
Volume12Issue:1Pages:19
Corresponding AuthorYu, Fei(yuf@qdio.ac.cn) ; Zhang, Yuanzhi(yuanzhizhang@cuhk.edu.hk)
AbstractThree typhoon events were selected to examine the impact of energy transformation on near-inertial oscillations (NIOs) using observations from a subsurface mooring, which was deployed at 125 degrees E and 18 degrees N on 26 September 2014 and recovered on 11 January 2016. Almost 16 months of continuous observations were undertaken, and three energetic NIO events were recorded, all generated by passing typhoons. The peak frequencies of these NIOs, 0.91 times of the local inertial frequency f, were all lower than the local inertial frequency f. The estimated vertical group velocities (C-gz) of the three NIO events were 11.9, 7.4, and 23.0 m d(-1), and were relatively small compared with observations from other oceans (i.e., 100 m d(-1)). The directions of the horizontal near-inertial currents changed four or five times between the depths of 40 and 800 m in all three NIO events, implying that typhoons in the northwest Pacific usually generate high-mode NIOs. The NIO currents were further decomposed by performing an empirical orthogonal function (EOF) analysis. The first and second EOF modes dominated the NIOs during each typhoon, accounting for more than 50% of the total variance. The peak frequencies of the first two EOF modes were less than f, but those of the third and fourth modes were higher than f. The frequencies of all the modes during non-typhoon periods were more than f. Our analysis indicates that the relatively small downward group velocity was caused by the frequent direction changes of the near-inertial currents with depth.
KeywordNear-inertial kinetic energy vertical group velocity near-inertial oscillations energy transformation
DOI10.3390/en12010099
Indexed BySCI
Language英语
Funding ProjectNational Key R&D Program of China[2017YFC1403400] ; National Key R&D Program of China[2016YFC1402003] ; National Natural Science Foundation of China[U1406401] ; National Natural Science Foundation of China[41421005] ; Global Change and Air Sea Interaction Project[GASI-02-PAC-STMSspr]
WOS Research AreaEnergy & Fuels
WOS SubjectEnergy & Fuels
WOS IDWOS:000460665000099
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/155281
Collection海洋环流与波动重点实验室
Corresponding AuthorYu, Fei; Zhang, Yuanzhi
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Wave Studies, Qingdao 266071, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Nanjing Univ Informat Sci & Technol, Nanjing 210044, Jiangsu, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Hou, Huaqian,Yu, Fei,Nan, Feng,et al. Observation of Near-Inertial Oscillations Induced by Energy Transformation during Typhoons[J]. ENERGIES,2019,12(1):19.
APA Hou, Huaqian,Yu, Fei,Nan, Feng,Yang, Bing,Guan, Shoude,&Zhang, Yuanzhi.(2019).Observation of Near-Inertial Oscillations Induced by Energy Transformation during Typhoons.ENERGIES,12(1),19.
MLA Hou, Huaqian,et al."Observation of Near-Inertial Oscillations Induced by Energy Transformation during Typhoons".ENERGIES 12.1(2019):19.
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