Institutional Repository of Key Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences
| Intensified Deep Ocean Variability Induced by Topographic Rossby Waves at the Pacific Yap-Mariana Junction | |
Ma, Qiang1,2 ; Wang, Fan1,2,3; Wang, Jianing1,3; Lyu, Yilong1,2
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| 2019-11-30 | |
| Source Publication | JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
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| ISSN | 2169-9275 |
| Pages | 15 |
| Corresponding Author | Wang, Fan(fwang@qdio.ac.cn) ; Wang, Jianing(wjn@qdio.ac.cn) |
| Abstract | In a deep channel at the Pacific Yap-Mariana Junction, intensified variability of flow and isotherm displacements over 3,000-4,600 m is revealed by two separate observations: the recent one during 2014-2016 and the two 20 years ago during 1996-1998. Observed velocity and isotherm displacements can reach 45 cm s(-1) and similar to 600 m at 4,200 m, respectively. Such intensified variability is demonstrated to arise from topographic Rossby waves (TRWs) since vertical profiles of observed currents reasonably conform to TRW features of hyperbolic intensification with depth and highly vertical coherence in phase. Mercator Ocean model outputs reproduce observed TRWs and are used to discuss their energy sources. Both the energetic surface eddy moving across rough topography and mixed barotropic-baroclinic instability of the background flow appear to be the candidates to generate TRWs. Plain Language Summary Traditionally, the deep sea has been viewed as quiet, with weak horizontal and vertical motions; however, results from three subsurface moorings in a deep channel at the Pacific Yap-Mariana Junction show that the fluctuations of deep current speed and isotherm displacement intensify significantly with increasing depth. The observed velocity and isotherm displacements can reach 45 cm s(-1) and similar to 600 m at 4,200 m, comparable to that in the upper ocean. We interpret these deep fluctuations as topographic Rossby waves (TRWs) since vertical distributions of observed velocities obey TRW features of hyperbolic intensification with depth and highly vertical coherence in phase. With the aid of Mercator Ocean model outputs, the TRWs are deemed to arise from the energetic surface eddy moving across the rough topography and barotropic and baroclinic instabilities of the background flow. |
| Keyword | Moored Observations Intensified Fluctuation Deep Ocean Topographic Rossby Wave |
| DOI | 10.1029/2019JC015490 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | Strategic Priority Research Program of the Chinese Academy of Sciences[XDA22000000] ; National Natural Science Foundation of China[41776022] ; National Natural Science Foundation of China[41730534] ; National Natural Science Foundation of China[41421005] ; National Natural Science Foundation of China[U1406401] ; China Ocean Mineral Resources Research and Development Association Program[DY135-E2-3-02] ; Scientific and Technological Innovation Project by Qingdao National Laboratory for Marine Science and Technology[2016ASKJ12] ; National Program on Global Change and Air-Sea Interaction[GASI-IPOVAI-01-01] |
| WOS Research Area | Oceanography |
| WOS Subject | Oceanography |
| WOS ID | WOS:000499619700001 |
| Publisher | AMER GEOPHYSICAL UNION |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.qdio.ac.cn/handle/337002/163757 |
| Collection | 海洋环流与波动重点实验室 |
| Corresponding Author | Wang, Fan; Wang, Jianing |
| Affiliation | 1.Chinese Acad Sci, Key Lab Ocean Circulat & Waves, Inst Oceanol, Ctr Ocean Mega Sci, Qingdao, Shandong, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Ocean & Climate Dynam, Qingdao, Shandong, Peoples R China |
| First Author Affilication | Key Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences |
| Corresponding Author Affilication | Key Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences |
| Recommended Citation GB/T 7714 | Ma, Qiang,Wang, Fan,Wang, Jianing,et al. Intensified Deep Ocean Variability Induced by Topographic Rossby Waves at the Pacific Yap-Mariana Junction[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2019:15. |
| APA | Ma, Qiang,Wang, Fan,Wang, Jianing,&Lyu, Yilong.(2019).Intensified Deep Ocean Variability Induced by Topographic Rossby Waves at the Pacific Yap-Mariana Junction.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,15. |
| MLA | Ma, Qiang,et al."Intensified Deep Ocean Variability Induced by Topographic Rossby Waves at the Pacific Yap-Mariana Junction".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS (2019):15. |
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