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

CORC > 海洋研究所 > 中国科学院海洋研究所 > 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
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
	2013-10-01
卷号	118 期号:10 页码:4989-5006
关键词	North Equatorial Current decadal variations
ISSN号	2169-9275
通讯作者	Hu, DX
中文摘要	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.
英文摘要	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.
学科主题	Oceanography
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Oceanography
研究领域[WOS]	Oceanography
关键词[WOS]	WESTERN TROPICAL PACIFIC ; ENSO AMPLITUDE-MODULATION ; BAROCLINIC ROSSBY WAVES ; WATER MASS-DISTRIBUTION ; INTERANNUAL VARIABILITY ; CURRENT BIFURCATION ; PHILIPPINE COAST ; MINDANAO CURRENT ; SEA-LEVEL ; OCEAN
收录类别	SCI
原文出处	10.1002/jgrc.20391
语种	英语
WOS记录号	WOS:000327380100017
公开日期	2014-07-17
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/16397]
专题	海洋研究所_海洋环流与波动重点实验室
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
推荐引用方式 GB/T 7714	Zhai, Fangguo,Hu, Dunxin,Qu, Tangdong. 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.(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.