Intraseasonal Variability of Full-Depth Currents in the Philippine Sea

doi:10.1029/2023JC019827

IOCAS-IR > 海洋环流与波动重点实验室

	Intraseasonal Variability of Full-Depth Currents in the Philippine Sea
	Yuan, Xin1,2,3,4,5 ; Wang, Qingye 1,2,3,6; Hu, Dunxin 1,2,3,6; Feng, Junqiao 1,2,3,6; Wang, Fujun 1,2,3,6; Tian, Zhizhao 1,2,7
	2024-05-01
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN	2169-9275
卷号	129 期号:5 页码:17
通讯作者	Wang, Qingye([email protected])
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
关键词	intraseasonal variability (ISV) deep ocean in situ measurements Rossby normal mode El Ni & ntilde Philippine Sea o
DOI	10.1029/2023JC019827
收录类别	SCI
语种	英语
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
WOS类目	Oceanography
WOS记录号	WOS:001233333000001
出版者	AMER GEOPHYSICAL UNION
WOS关键词	NORTH EQUATORIAL CURRENT ; WESTERN BOUNDARY CURRENTS ; OCEAN CIRCULATION ; UNDERCURRENT JETS ; NORMAL-MODES ; PACIFIC ; BIFURCATION ; DYNAMICS ; FEATURES ; EDDIES
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/185976
专题	海洋环流与波动重点实验室
通讯作者	Wang, Qingye
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Observat & Forecasting, Qingdao, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 3.Univ Chinese Acad Sci, Beijing, Peoples R China 4.Hebei Normal Univ Sci & Technol, Res Ctr Marine Sci, Qinhuangdao, Peoples R China 5.Hebei Key Lab Ocean Dynam Resources & Environm, Qinhuangdao, Peoples R China 6.Laoshan Lab, Qingdao, Peoples R China 7.Shandong Univ Sci & Technol, Qingdao, Peoples R China
第一作者单位	中国科学院海洋研究所; 海洋环流与波动重点实验室
通讯作者单位	中国科学院海洋研究所; 海洋环流与波动重点实验室
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.