Observed hydrographical features and circulation with influences of cyclonic-anticyclonic eddy-pair in the northern slope of the South China Sea during June 2015

doi:10.3969/j.issn.1001-909X.2016.04.002

Abstract

Abstract: Using in situ hydrographic measurements during June 2015 and satellite altimeter data provided by archiving validation and interpretation of satellite oceanographic data(AVISO), the hydrographical features and circulation with influences of cyclonic-anticyclonic eddy-pair in the northern slope of the South China Sea during June 2015 were studied. The results showed that the low-salinity water in northeast-southwest direction was found in the upper 50 m in the northern slope of the South China Sea during June 2015. The minimum surface salinity values were below 32, which indicated the presence of cross-slope transport in the northern slope of the South China Sea. Due to the existence of cyclonic-anticyclonic eddy-pair in the northern slope of the South China Sea during the observation, the cross-slope currents were found in the upper 100 m,of which the maximum velocity was observed in the intersection of two eddies. In addition, the circulation across the continental slope in the Northern South China Sea derived from the moored current measurements, presented two-layer structure: offshore flow in the upper 100 m and onshore flow beneath 100 m.

Key words: Northern South China Sea, continental slope, circulation, cyclonic-anticyclonic eddy-pair

CLC Number:

P731.2

CHEN Zhong-wei, YANG Cheng-hao, XU Dong-feng, XU Ming-quan. Observed hydrographical features and circulation with influences of cyclonic-anticyclonic eddy-pair in the northern slope of the South China Sea during June 2015[J]. Journal of Marine Sciences, 2016, 34(4): 10-19.

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