Persistent upwelling and front over the Sulu Ridge and their variations
Jing, ZY; Qi, YQ; Du, Y; jingzhiyou@scsio.ac.cn
2012
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN0148-0227
卷号117页码:C11011
摘要The persistent upwelling and front isolated over the Sulu Ridge are newly detected by a suite of satellite measurements and confirmed by historical cruise observations. A three-dimensional tide-circulation coupled model is employed to investigate the dynamic mechanisms. The intense vertical velocity shear induced by the vigorous internal tidal mixing is identified as the vital dynamic factor to trigger the upwelling and nutrient pumping, through the strong tide-topography interactions. Satellite observations indicate that the pronounced surface cooling and phytoplankton bloom are isolated over the Sulu Ridge throughout the year. The steady front characterizes 10-20 km width and strength over 0.3 degrees C/km near the southern edge. The feature is further confirmed by the numerical simulation and in situ hydrological observation. Modeling experiment suggests that a quasi-symmetrical vertical circulation bifurcation across the Sulu Ridge due to the asymmetry of tidal currents is the main mechanism to maintain the persistent upwelling and front. Moreover, the local wind forcing plays an important regulating role in the seasonal and interannual variations. The surface cooling and thermal front intensity reach the maximum in winter under the forcing of strong northeasterly monsoons. Due to prolonged El Nino-Southern Oscillation (ENSO) effects, the surface cooling was significantly weakened during 1998 and 2010 summer. Further analysis indicates the fact that the southwesterly monsoon is weakened dramatically as part of the anticyclonic atmospheric circulation anomalies over the northwest Pacific. The latter results from the significant influence of tropical Indian Ocean capacitor effect associated with El Nino-Southern Oscillation.
部门归属[Jing, Zhiyou; Qi, Yiquan; Du, Yan] Chinese Acad Sci, State Key Lab Trop Oceanog, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China
学科领域Oceanography
语种英语
资助项目LTO
WOS记录号WOS:000310966400003
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被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/10047
专题热带海洋环境国家重点实验室(LTO)
通讯作者jingzhiyou@scsio.ac.cn
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Jing, ZY,Qi, YQ,Du, Y,et al. Persistent upwelling and front over the Sulu Ridge and their variations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2012,117:C11011.
APA Jing, ZY,Qi, YQ,Du, Y,&jingzhiyou@scsio.ac.cn.(2012).Persistent upwelling and front over the Sulu Ridge and their variations.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,117,C11011.
MLA Jing, ZY,et al."Persistent upwelling and front over the Sulu Ridge and their variations".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 117(2012):C11011.
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