Interannual Variations of Subsurface Spiciness in the Philippine Sea: Observations and Mechanism

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

	Interannual Variations of Subsurface Spiciness in the Philippine Sea: Observations and Mechanism
	Li, Yuanlong 1,2; Wang, Fan1 ; Zhai, Fangguo 1,2
刊名	JOURNAL OF PHYSICAL OCEANOGRAPHY
	2012-06-01
卷号	42 期号:6 页码:1022-1038
关键词	NORTH EQUATORIAL CURRENT TROPICAL PACIFIC-OCEAN MINDANAO CURRENT TEMPERATURE ANOMALIES CURRENT BIFURCATION VARIABILITY CIRCULATION WATER SALINITY THERMOCLINE
ISSN号	0022-3670
通讯作者	Wang, F (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, 7 Nanhai Rd, Qingdao 266071, Peoples R China.
英文摘要	The Philippine Sea (PS) is a key region connecting North Pacific subtropics to the equator via western boundary currents. Using available measurements from Argo profiling floats, satellite altimeters, and research surveys, the authors investigate the characteristics and mechanism of subsurface spiciness variability (represented by salinity changes between 23.5 and 24.5 sigma(theta)) in the PS. During the past decade, low-frequency salinity variability was dominated by interannual signals characterized by out-of-phase changes between the southern and northern PS with peak-to-peak amplitudes exceeding 0.1 psu. These salinity anomalies are mainly generated locally by anomalous cross-front geostrophic advections. In 2003, an anomalous cyclonic circulation developed in the PS, which transported greater (less) than normal high-salinity North Pacific Tropical Water to the northern (southern) PS and produced positive (negative) salinity anomalies there. In 2009, an anomalous anticyclone emerged, which produced negative (positive) salinity anomalies in the northern (southern) PS. These year-to-year variations are closely associated with ENSO cycle. During strong El Nino (La Nina) episodes, positive (negative) wind stress curl anomalies between 8 degrees and 18 degrees N evoke westward-propagating upwelling (downwelling) Rossby waves in the central Pacific and positive (negative) anomalous Ekman pumping in the western Pacific, resulting in the observed current and salinity changes in the PS. Further analysis suggests that these locally generated spiciness anomalies disperse quickly while propagating to the equatorial Pacific in the Mindanao Current (MC). In the meantime, anomalies advected from higher latitudes are nearly diminished upon reaching the PS. The western boundary of the North Pacific seems quite efficient in damping extratropical signals.
学科主题	Oceanography
收录类别	SCI
原文出处	10.1175/JPO-D-12-06.1
语种	英语
WOS记录号	WOS:000305845700009
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/12161]
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, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Li, Yuanlong,Wang, Fan,Zhai, Fangguo. Interannual Variations of Subsurface Spiciness in the Philippine Sea: Observations and Mechanism[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2012,42(6):1022-1038.
APA	Li, Yuanlong,Wang, Fan,&Zhai, Fangguo.(2012).Interannual Variations of Subsurface Spiciness in the Philippine Sea: Observations and Mechanism.JOURNAL OF PHYSICAL OCEANOGRAPHY,42(6),1022-1038.
MLA	Li, Yuanlong,et al."Interannual Variations of Subsurface Spiciness in the Philippine Sea: Observations and Mechanism".JOURNAL OF PHYSICAL OCEANOGRAPHY 42.6(2012):1022-1038.