The role of mindanao dome in the variability of the Pacific North equatorial current bifurcation

doi:10.1007/s10872-013-0175-7

IOCAS-IR > 海洋环流与波动重点实验室

	The role of mindanao dome in the variability of the Pacific North equatorial current bifurcation
	Zhao, Jun1,2 ; Li, Yuanlong 1,3; Wang, Fan1 ; Wang, F
	2013-06-01
发表期刊	JOURNAL OF OCEANOGRAPHY
ISSN	0916-8370
卷号	69 期号:3 页码:313-327
文章类型	Article
摘要	The Mindanao Dome (MD) features prominent oceanic variability and is located geographically close to the bifurcation latitude Y (b) of the Pacific North Equatorial Current. In this study, the role of the MD in the variability of Y (b) is examined with 20 years of satellite altimetric sea surface height (SSH) data and a 1.5-layer linear Rossby wave model. It is shown that the seasonal variations of surface Y (b) are related to not only the SSH fluctuations near the bifurcation point (bifurcation box; 125A degrees-130A degrees E, 12A degrees-15A degrees N) but also those outstanding in the MD region (MD box; 127A degrees-132A degrees E, 6A degrees-9A degrees N). The impact of the MD SSH changes is significant when the bifurcation point stays at southerly latitudes during February-September, which hinders (delays) the southward leap (northward retreat) of Y (b) in April-May (July-August) and thus leads to the asymmetry of the mean Y (b) seasonal cycle (with a positive skewness of gamma = +0.64). Such asymmetry also shows year-to-year variations depending on yearly mean Y (b) value. A southerly yearly mean Y (b) involves larger contribution of the MD and thus causes larger asymmetry of Y (b) seasonal cycle. At interannual and longer timescales, the MD acts to amplify the fluctuations of the bifurcation. It is responsible for about 20 % of the total low-frequency Y (b) variances and plays an important role in the 0.12A degrees A year(-1) southward trend of Y (b) in the past two decades. The impact of the MD on Y (b) changes is becoming increasingly significant at various timescales such as the bifurcation point migrating southward in recent years.; The Mindanao Dome (MD) features prominent oceanic variability and is located geographically close to the bifurcation latitude Y (b) of the Pacific North Equatorial Current. In this study, the role of the MD in the variability of Y (b) is examined with 20 years of satellite altimetric sea surface height (SSH) data and a 1.5-layer linear Rossby wave model. It is shown that the seasonal variations of surface Y (b) are related to not only the SSH fluctuations near the bifurcation point (bifurcation box; 125A degrees-130A degrees E, 12A degrees-15A degrees N) but also those outstanding in the MD region (MD box; 127A degrees-132A degrees E, 6A degrees-9A degrees N). The impact of the MD SSH changes is significant when the bifurcation point stays at southerly latitudes during February-September, which hinders (delays) the southward leap (northward retreat) of Y (b) in April-May (July-August) and thus leads to the asymmetry of the mean Y (b) seasonal cycle (with a positive skewness of gamma = +0.64). Such asymmetry also shows year-to-year variations depending on yearly mean Y (b) value. A southerly yearly mean Y (b) involves larger contribution of the MD and thus causes larger asymmetry of Y (b) seasonal cycle. At interannual and longer timescales, the MD acts to amplify the fluctuations of the bifurcation. It is responsible for about 20 % of the total low-frequency Y (b) variances and plays an important role in the 0.12A degrees A year(-1) southward trend of Y (b) in the past two decades. The impact of the MD on Y (b) changes is becoming increasingly significant at various timescales such as the bifurcation point migrating southward in recent years.
关键词	Mindanao Dome North Equatorial Current Bifurcation Seasonal Cycle Philippine Sea Asymmetry Sea Surface Height Rossby Wave
学科领域	Oceanography
DOI	10.1007/s10872-013-0175-7
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:000319421300003
WOS关键词	WESTERN TROPICAL PACIFIC ; BAROCLINIC ROSSBY WAVES ; INTERANNUAL VARIABILITY ; PHILIPPINE SEA ; BOUNDARY CURRENTS ; OCEAN ; CIRCULATION ; KUROSHIO ; LATITUDE ; LEVEL
WOS标题词	Science & Technology ; Physical Sciences
引用统计	被引频次：9[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/337002/16442
专题	海洋环流与波动重点实验室
通讯作者	Wang, F
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA
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. The role of mindanao dome in the variability of the Pacific North equatorial current bifurcation[J]. JOURNAL OF OCEANOGRAPHY,2013,69(3):313-327.
APA	Zhao, Jun,Li, Yuanlong,Wang, Fan,&Wang, F.(2013).The role of mindanao dome in the variability of the Pacific North equatorial current bifurcation.JOURNAL OF OCEANOGRAPHY,69(3),313-327.
MLA	Zhao, Jun,et al."The role of mindanao dome in the variability of the Pacific North equatorial current bifurcation".JOURNAL OF OCEANOGRAPHY 69.3(2013):313-327.

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