Decadal variations of the North Equatorial Current in the Pacific at 137 degrees E

doi:10.1002/jgrc.20391

IOCAS-IR > 海洋环流与波动重点实验室

	Decadal variations of the North Equatorial Current in the Pacific at 137 degrees E
	Zhai, Fangguo 1,2,3; Hu, Dunxin 1,2; Qu, Tangdong 4; Hu, DX
	2013-10-01
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN	2169-9275
卷号	118 期号:10 页码:4989-5006
文章类型	Article
摘要	Hydrographic observations, ocean state estimates, and ocean objective analyses are combined to investigate the decadal variations of the North Equatorial Current (NEC) in the Pacific at 137 degrees E during the last three decades (1975-2005). Observations show that the decadal NEC transport has three maxima around 1980/1981, 1994/1995, and 2004/2005, and two minima around 1989/1990 and 1999/2000, respectively. Associated with these maxima/minima, the sea surface height (SSH) falls/rises and the subsurface isopycnals shoal/deepen in the southern part of NEC, resulting in westward/eastward zonal velocity anomalies. Results from the ocean state estimates and ocean objective analyses show good agreement with observations. Further analysis indicates that the observed zonal velocity anomalies at 137 degrees E are part of the cyclonic/anticyclonic gyre anomalies formed in the tropical northwestern Pacific east of the Philippines, coinciding with the tropical gyre. Results from a 11/2 layer reduced gravity model suggest that these oceanic variations are mainly controlled by the decadal wind forcing in the tropical western Pacific and can be attributed to both local Ekman dynamics and baroclinic Rossby wave propagation.; Hydrographic observations, ocean state estimates, and ocean objective analyses are combined to investigate the decadal variations of the North Equatorial Current (NEC) in the Pacific at 137 degrees E during the last three decades (1975-2005). Observations show that the decadal NEC transport has three maxima around 1980/1981, 1994/1995, and 2004/2005, and two minima around 1989/1990 and 1999/2000, respectively. Associated with these maxima/minima, the sea surface height (SSH) falls/rises and the subsurface isopycnals shoal/deepen in the southern part of NEC, resulting in westward/eastward zonal velocity anomalies. Results from the ocean state estimates and ocean objective analyses show good agreement with observations. Further analysis indicates that the observed zonal velocity anomalies at 137 degrees E are part of the cyclonic/anticyclonic gyre anomalies formed in the tropical northwestern Pacific east of the Philippines, coinciding with the tropical gyre. Results from a 11/2 layer reduced gravity model suggest that these oceanic variations are mainly controlled by the decadal wind forcing in the tropical western Pacific and can be attributed to both local Ekman dynamics and baroclinic Rossby wave propagation.
关键词	North Equatorial Current Decadal Variations
学科领域	Oceanography
DOI	10.1002/jgrc.20391
URL	查看原文
收录类别	SCI
语种	英语
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:000327380100017
WOS关键词	WESTERN TROPICAL PACIFIC ; ENSO AMPLITUDE-MODULATION ; BAROCLINIC ROSSBY WAVES ; WATER MASS-DISTRIBUTION ; INTERANNUAL VARIABILITY ; CURRENT BIFURCATION ; PHILIPPINE COAST ; MINDANAO CURRENT ; SEA-LEVEL ; OCEAN
WOS标题词	Science & Technology ; Physical Sciences
引用统计	被引频次：25[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/16397
专题	海洋环流与波动重点实验室
通讯作者	Hu, DX
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 3.State Ocean Adm, Inst Oceanog 3, Xiamen, Peoples R China 4.Univ Hawaii Manoa, Sch Ocean & Earth Sci & Technol, Int Pacific Res Ctr, Honolulu, HI USA
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
推荐引用方式 GB/T 7714	Zhai, Fangguo,Hu, Dunxin,Qu, Tangdong,et al. Decadal variations of the North Equatorial Current in the Pacific at 137 degrees E[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2013,118(10):4989-5006.
APA	Zhai, Fangguo,Hu, Dunxin,Qu, Tangdong,&Hu, DX.(2013).Decadal variations of the North Equatorial Current in the Pacific at 137 degrees E.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,118(10),4989-5006.
MLA	Zhai, Fangguo,et al."Decadal variations of the North Equatorial Current in the Pacific at 137 degrees E".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 118.10(2013):4989-5006.

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