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

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	The role of mindanao dome in the variability of the Pacific North equatorial current bifurcation
	Zhao, Jun 1,2; Li, Yuanlong 1,3; Wang, Fan1 ; Wang, F
刊名	JOURNAL OF OCEANOGRAPHY
	2013-06-01
卷号	69 期号:3 页码:313-327
关键词	Mindanao dome North equatorial current bifurcation Seasonal cycle Philippine Sea Asymmetry Sea surface height Rossby wave
ISSN号	0916-8370
通讯作者	Wang, F
中文摘要	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.
英文摘要	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.
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 ; BAROCLINIC ROSSBY WAVES ; INTERANNUAL VARIABILITY ; PHILIPPINE SEA ; BOUNDARY CURRENTS ; OCEAN ; CIRCULATION ; KUROSHIO ; LATITUDE ; LEVEL
收录类别	SCI
原文出处	10.1007/s10872-013-0175-7
语种	英语
WOS记录号	WOS:000319421300003
公开日期	2014-07-17
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/16442]
专题	海洋研究所_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
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.