Intraseasonal Variability of Full-Depth Currents in the Philippine Sea
文献类型：期刊论文
| 作者 | Yuan, Xin1,2,5,6,7 ; Wang, Qingye3,5,6,7; Hu, Dunxin3,5,6,7; Feng, Junqiao3,5,6,7; Wang, Fujun3,5,6,7; Tian, Zhizhao4,5,6
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| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
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| 出版日期 | 2024-05-01 |
| 卷号 | 129期号:5页码:17 |
| 关键词 | intraseasonal variability (ISV) deep ocean in situ measurements Rossby normal mode El Ni & ntilde Philippine Sea o |
| ISSN号 | 2169-9275 |
| DOI | 10.1029/2023JC019827 |
| 通讯作者 | Wang, Qingye(wangqy@qdio.ac.cn) |
| 英文摘要 | Intraseasonal variability (ISV) in the meridional velocity of multi-layer currents in the Philippines Sea was investigated using near full-depth mooring observations deployed at 130 degrees E, 11 degrees N from September 2015 to October 2019 and the reanalysis data from 2015 to 2019. Prominent bimodal ISVs structures were detected in the power spectra of the meridional velocities at 45- and 62-days, occurring from the surface through to the bottom. Further analysis suggested that the identified ISV of 62-days in the upper 1,500 m was controlled by large-scale oceanic Rossby waves with a zonal wavelength of 687 km. The full-depth 45-days fluctuation is limited by the entire zonal width of the Philippines Basin, which is approximately 900 km. The 45-days variability modulated by the barotropic Rossby normal mode triggered by resonant wind forcing in the key region of 126 degrees-140 degrees E and 5 degrees-13 degrees N. Whereas the deep-layer 62-days fluctuation is limited by the basin width near the bottom (5,700 m), which is approximately 640 km. In addition, two super-intense ISV events occurred in the upper layers following the 2015/16 and 2018/19 El Ni & ntilde;o events, which generally lagged the Ni & ntilde;o 3.4 index by six/seven months. This study reveals the upper-layer ocean ISVs response in the western Pacific following El Ni & ntilde;o events and triggering of the deep-layer ocean ISVs by the actual basin scale. Our findings provide a better understanding of the variations in full-depth currents in the western Pacific Ocean. Compared to the upper ocean variability, which is well-known to oceanographers, the variability of the intermediate-deep ocean is mysterious, because it is largely limited by the paucity of in situ observations in the deep ocean. The 4-year continuous direct current measurements used in this study are invaluable for studying the intraseasonal variability (ISV) of meridional velocity in the Philippine Sea. Near full-depth measurements revealed a bimodal ISV structure with 45-, and 62-days in the power spectrum of the meridional velocity. Further analysis demonstrated that the 62-day ISV of the meridional velocity in the upper ocean was mainly controlled by the westward-propagation first-mode baroclinic Rossby wave, and deep-layer ISVs of the meridional velocity were modulated by barotropic Rossby normal mode that depended on the actual Philippine basin scale. In addition, the two super-intense ISV events observed in the upper-layer ocean in the western Pacific were strongly associated with El Ni & ntilde;o events. This study revealed a previously unclear variability in deep-layer currents triggered by the actual basin scale, which greatly enriched our understanding of full-depth circulation variation in the Philippine Sea. Bimodal intraseasonal variability (ISV) in the full-depth meridional velocity was observed in the Philippine Sea Upper-layer 62 days ISV was controlled by the first-mode baroclinic Rossby wave, and its intensity increased dramatically after El Ni & ntilde;o Full-depth 45 days and deep-layer 62 days ISVs were modulated by the barotropic Rossby normal mode and triggered by resonant wind forcing |
| WOS关键词 | NORTH EQUATORIAL CURRENT ; WESTERN BOUNDARY CURRENTS ; OCEAN CIRCULATION ; UNDERCURRENT JETS ; NORMAL-MODES ; PACIFIC ; BIFURCATION ; DYNAMICS ; FEATURES ; EDDIES |
| 资助项目 | National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42010102] ; [42022040] ; [41976011] |
| WOS研究方向 | Oceanography |
| 语种 | 英语 |
| WOS记录号 | WOS:001233333000001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/185975]  |
| 专题 | 海洋研究所_海洋环流与波动重点实验室 |
| 通讯作者 | Wang, Qingye |
| 作者单位 | 1.Hebei Normal Univ Sci & Technol, Res Ctr Marine Sci, Qinhuangdao, Peoples R China 2.Hebei Key Lab Ocean Dynam Resources & Environm, Qinhuangdao, Peoples R China 3.Laoshan Lab, Qingdao, Peoples R China 4.Shandong Univ Sci & Technol, Qingdao, Peoples R China 5.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Observat & Forecasting, Qingdao, Peoples R China 6.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 7.Univ Chinese Acad Sci, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yuan, Xin,Wang, Qingye,Hu, Dunxin,et al. Intraseasonal Variability of Full-Depth Currents in the Philippine Sea[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2024,129(5):17. |
| APA | Yuan, Xin,Wang, Qingye,Hu, Dunxin,Feng, Junqiao,Wang, Fujun,&Tian, Zhizhao.(2024).Intraseasonal Variability of Full-Depth Currents in the Philippine Sea.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,129(5),17. |
| MLA | Yuan, Xin,et al."Intraseasonal Variability of Full-Depth Currents in the Philippine Sea".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 129.5(2024):17. |
入库方式： OAI收割
来源：海洋研究所
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