Decadal changes of the intermediate water at 18&#176;N in the South China Sea

Zhao Deping; Wang Weiqiang; Qin Huiling; Mao Qingwen; Wang Dongxiao; Chen Rongyu

doi:10.3969.issn.0253-4193.2014.09.007

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Zhao Deping, Wang Weiqiang, Qin Huiling, Mao Qingwen, Wang Dongxiao, Chen Rongyu. Decadal changes of the intermediate water at 18°N in the South China Sea[J]. Haiyang Xuebao, 2014, 36(9): 56-64. doi: 10.3969.issn.0253-4193.2014.09.007

Citation:

Zhao Deping, Wang Weiqiang, Qin Huiling, Mao Qingwen, Wang Dongxiao, Chen Rongyu. Decadal changes of the intermediate water at 18°N in the South China Sea[J]. Haiyang Xuebao, 2014, 36(9): 56-64. doi: 10.3969.issn.0253-4193.2014.09.007

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Decadal changes of the intermediate water at 18°N in the South China Sea

doi: 10.3969.issn.0253-4193.2014.09.007

1.
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;University of Chinese Academy of Sciences, Beijing 100049, China
2.
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China

Received Date: 2013-09-11
Rev Recd Date: 2013-12-10

Abstract

Abstract

Decadal change characteristics of the intermediate water at 18°N in the South China Sea during 1965 and 2012 were investigated using the historical temperature and salinity profile data from SCSIO (South China Sea Institute of Oceanology) and WOD09 (World Ocean Database 2009). This study revealed the significant decadal changes of the intermediate water based on the analysis of its decadal averaged salinity. The salinity was 34.432 on average in the period of 1965 to 1977 and increased to 34.440 in the 1980s, followed by an evident decrease after the 1990s. Modulated by the decadal scale changes, the salinity variation presented different trends in different periods. There was a significant decrease trend from 1967 to 1977, followed by a further decrease from 34.450 to 34.414 during 1990 and 1997. Thereafter there appeared a significant increase. Meanwhile, the temperature presented the same changing trends. Both temperature and salinity decreased in the 21st century with smaller amplitude of variation compared those in 1990s. The decadal changes of the intermediate water at 18°N were found to present different characteristics than those of Indian Ocean and the Pacific Ocean. In addition, the significant decadal changes of the intermediate water have greater amplitudes than those of the decadal scale variations. In addition, it is found that the salinity was closely related with ENSO that it reached its minimum in El Niño years.
- South China Sea,
- 18°,
- N,
- intermediate water,
- decadal changes

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