Spatial-temporal patterns and driving mechanisms of semiannual variations in the Philippine Sea

doi:10.1016/j.dsr.2012.07.001

IOCAS-IR > 海洋环流与波动重点实验室

	Spatial-temporal patterns and driving mechanisms of semiannual variations in the Philippine Sea
	Zhao, Jun 1,2; Li, Yuanlong 1,2; Wang, Fan1 ; Zhai, Fangguo 1,2; Yu, Xiaolin 3; Wang, F (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China.
	2012-10-01
发表期刊	DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
ISSN	0967-0637
卷号	68 页码:105-115
文章类型	Article
摘要	Satellite altimetric sea surface height (SSH) measurements from 1992 through 2010 are used to explore the oceanic semiannual variations in the Philippine Sea (PS). Pronounced semiannual SSH variations are detected within two zonal bands. One lies east of Luzon Strait (19 degrees-22 degrees N) in the northern PS, while the other is southeast of Mindanao coast (4 degrees-7 degrees N) in the southern PS. In the two near-coast boxes where semiannual harmonic amplitude exceeds 4 cm, the northern box (127 degrees-133 degrees E, 19 degrees-22 degrees N) and the southern box (127 degrees-133 degrees E, 4 degrees-7 degrees N), semiannual changes contribute considerably to the total annual SSH variance by 12% and 17%, respectively. Despite prominent SSH variability, the bifurcation latitude of the North Equatorial Current (NBL) exhibits weak fluctuations with a peak-to-peak difference of only 0.3 degrees on semiannual time scale. While the in-phase annual SSH variations between the two boxes work together to enhance annual NBL changes, their out-of-phase semiannual SSH variations offset each other in driving the NBL displacements. Further analysis with a 1 1/2-layer reduced-gravity model forced by ECMWF wind stress reveals that the observed semiannual SSH variations are primarily driven by local wind forcing in the far western Pacific. Rossby wave signals propagating from the eastern/central Pacific contribute much less due to along-path dispersion and cancellation. Semiannual signals of wind field in the northern PS reflect mainly the semiannual changes of the Asian Monsoon system, while those in the southern PS arise from the combined effects of Monsoon transition and the annual migration of the intertropical convergence zone (ITCZ). (c) 2012 Elsevier Ltd. All rights reserved.
关键词	Semiannual Variations Sea Surface Height Nec Bifurcation Philippine Sea Wind Forcing
学科领域	Oceanography
DOI	10.1016/j.dsr.2012.07.001
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000309790800009
引用统计	被引频次：15[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/337002/12187
专题	海洋环流与波动重点实验室
通讯作者	Wang, F (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China.
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.Ocean Univ China, Phys Oceanog Lab, Qingdao 266100, Peoples R China
第一作者单位	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	Zhao, Jun,Li, Yuanlong,Wang, Fan,et al. Spatial-temporal patterns and driving mechanisms of semiannual variations in the Philippine Sea[J]. DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,2012,68:105-115.
APA	Zhao, Jun,Li, Yuanlong,Wang, Fan,Zhai, Fangguo,Yu, Xiaolin,&Wang, F .(2012).Spatial-temporal patterns and driving mechanisms of semiannual variations in the Philippine Sea.DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,68,105-115.
MLA	Zhao, Jun,et al."Spatial-temporal patterns and driving mechanisms of semiannual variations in the Philippine Sea".DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS 68(2012):105-115.

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