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Interannual Variations of Subsurface Spiciness in the Philippine Sea: Observations and Mechanism
Li, Yuanlong1,2; Wang, Fan1; Zhai, Fangguo1,2; Wang, F (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, 7 Nanhai Rd, Qingdao 266071, Peoples R China.
2012-06-01
发表期刊JOURNAL OF PHYSICAL OCEANOGRAPHY
ISSN0022-3670
卷号42期号:6页码:1022-1038
文章类型Article
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.
关键词North Equatorial Current Tropical Pacific-ocean Mindanao Current Temperature Anomalies Current Bifurcation Variability Circulation Water Salinity Thermocline
学科领域Oceanography
DOI10.1175/JPO-D-12-06.1
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收录类别SCI
语种英语
WOS记录号WOS:000305845700009
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被引频次:33[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/337002/12161
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, 7 Nanhai Rd, 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, Peoples R China
第一作者单位海洋环流与波动重点实验室
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Li, Yuanlong,Wang, Fan,Zhai, Fangguo,et al. 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,&Wang, F .(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.
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