| Statistical analysis of surface hydrography and circulation variations in northern South China Sea |
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| 作者姓名： | 吴玲娟 崔茂常 |
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| 作者单位： | Institute of Oceanology Chinese Academy of Sciences，Qingdao 266071 China The Graduate School of the Chinese Academy of Sciences Beijing 100039 China，Institute of Oceanology Chinese Academy of Sciences，Qingdao 266071 China Key Laboratory of Marine Science and Numerical Modeling of SOA Qingdao 266061 China |
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| 基金项目： | This work is supported by the Innovation Project of Chinese Academy of Sciences （KZCX3-SW-222）. |
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| 摘 要： | 1 INTRODUCTIONThe South China Sea (SCS) is a semi-enclosedmarginal sea in western North Pacific Ocean withvery complex topography and is the important pas-sage connecting the Pacific and Indian Oceans. Ithas great impact to the global climate and a greatinterest of many oceanography researchers. Twodominant surface hydrographic and circulation fea-tures in the northern SCS are a strong fresh waterexpansion and a warm and high-salinity seawaterintrusion such as the SCS Diluted Water…
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| 关 键 词： | 海洋 水文地理学 循环变化 南海 SCS |
| 收稿时间： | 2004-08-05 |
| 修稿时间： | 2005-04-08 |
Statistical analysis of surface hydrography and circulation variations in northern South China Sea |
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| Wu Lingjuan,Cui Maochang.Statistical analysis of surface hydrography and circulation variations in northern South China Sea[J].Chinese Journal of Oceanology and Limnology,2005,23(4):383-392. |
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| Authors: | Wu Lingjuan Cui Maochang |
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| Institution: | (1) Institute of Oceanology, Chinese Academy of Sciences, 266071 Qingdao, China;(2) The Graduate School of the Chinese Academy of Sciences, 100039 Beijing, China;(3) Key Laboratory of Marine Science and Numerical Modeling of SOA, 266061 Qingdao, China |
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| Abstract: | To study the variations in surface hydrography and circulation in northern South China Sea (NSCS), rotated empirical orthogonal
function (REOF) and extended associate pattern analysis (EAPA) are used with daily sea surface salinity (SSS), sea surface
temperature (SST) and sea surface height (SSH) datasets covering 1 126 days from American Navy Experimental Real-Time East
Asian Seas Ocean Nowcast System in this paper. Results show that in summer, the SCS Diluted Water Expansion (SDWE) is the
most dominant factor controlling SSS variations in the NSCS. The remarkable SDWE usually begins in early July, reaches its
maximum in middle August and weakens in late September. In summer fluorishing period, its low saline core is just limited
between 21°N and 22°N because of strong surface anomalous anticyclonic circulation in the NSCS. In early or late stage, the
anomalous anticyclonic circulation becomes weak or turns into cyclonic one, thus the weak SCS diluted water can disperse.
And its influence on the SSS variations has obviously decreased. The Kuroshio intrusion is the second controlling factor,
and it has the almost opposite seasonal or intraseasonal oscillations and spatial characteristics to the SDWE. Winter Kuroshio
Intrusion (WKI) begins in early November and lasts about three months. Intraseasonal Kuroshio Intrusion (IKI) takes place
at any seasons. The westward Ekman transport produced by the north anomaly of East Asia Monsoon (EAM) pushes warmer and more
saline seawater into the NSCS through the Bashi Strait and seems to decide the intensity of seasonal and intraseasonal Kuroshio
intrusions.
This work is supported by the Innovation Project of Chinese Academy of Sciences (KZCX3-SW-222). |
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| Keywords: | variations SCS diluted water expansion (SDWE) intraseasonal Kuroshio intrusion (IKI) winter Kuroshio intrusion (WKI) empirical orthogonal function (REOF) extended associate pattern analysis (EAPA) |
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