2014年春季南海中沙群岛北部海域的低温高盐水及其形成机制*

doi:10.11978/2014113

Journal of Tropical Oceanography ›› 2016, Vol. 35 ›› Issue (2): 1-9.doi: 10.11978/2014113CSTR: 32234.14.2014113

• Marine Hydrography • Next Articles

The formation mechanism of the low temperature and high salinity water mass near the Zhongsha Islands in the South China Sea in March 2014

TIAN Yongqing^{1, 2}, HUANG Honghui², GONG Xiuyu², YU Shaomei²

1. Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China; 2. Guangdong Provincial Key Laboratory of Fishery Ecology and Environment, South China Sea Fisheries Research Institute, Chinese Academy of Fisheries Sciences, Guangzhou 510300, China

Received:2014-09-25 Revised:2015-08-28 Online:2016-02-29 Published:2016-02-29
Contact: HUANG Honghui. E-mail: huanghh@scsfri.ac.cn
Supported by:
Scientific Research Foundation of Third Institute of Oceanography, SOA (2013035); Financial Fund of the Ministry of Agriculture (NFZX2013); Global Change And Ocean-Atmosphere Interaction (GASI-03-01-01-03); The Chinese Academy of Sciences Strategic Leading Science and Technology Projects (XDA1102030104); The National Special Research Fund for Non-Profit Marine Sector (201005005-2); The Basic Work of Science and Technology Special (2008FY110100)

Abstract

Abstract: Based on the analysis of temperature and salinity survey data in the central South China Sea (SCS) in March2014, we found that there existed a notable low temperature and high salinity water mass in the northern Zhongsha Islands. The core temperature of the water mass was only 25℃ in the surface layer (5 m), which was lower than that at the surrounding stations by at least 1℃, and its core salinity was 34.11 psu, which was higher than that at the surrounding stations by at least 0.74 psu. Furthermore, the water mass had influence on an area of about 1 longitude by 1.5 latitude, just 30 m from the sea surface, and it could last approximately for 13 days. Combining with the topography data, satellite altimeter data and wind data, we demonstrated the forming and decaying processes and dynamic mechanisms of the water mass. In early March, a strong mesoscale cold eddy shed from the Luzon cold eddy system and propagated to the west; it stagnated and deformed when encountering the continental shelf at about 115°E, 18°N. However, under the induction of topography and wind, the southern edge of the strong mesoscale cold eddy shed a small cyclonic eddy again, namely, the low temperature and high salinity water mass that was observed. The water mass propagated to the Zhongsha Islands area around the 3000m isobath. The water mass vanished owing to the wind direction change from the northeasterly on March 29to the southerly at the beginning of April. The southerly wind accelerated the mixing between the southern warm water and the low temperature and high salinity water mass, and then the low temperature and high salinity water mass disappeared at last.

Key words: Zhongsha Islands, Luzon cold eddy, northeast monsoon, low temperature and high salinity water mass, mesoscale eddy

TIAN Yongqing, HUANG Honghui, GONG Xiuyu, YU Shaomei. The formation mechanism of the low temperature and high salinity water mass near the Zhongsha Islands in the South China Sea in March 2014[J].Journal of Tropical Oceanography, 2016, 35(2): 1-9.

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The formation mechanism of the low temperature and high salinity water mass near the Zhongsha Islands in the South China Sea in March 2014

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