南海次表层盐度的低频变化及与太平洋年代际振荡的关系

doi:10.11978/2018128

Abstract

Abstract:

The South China Sea is the largest marginal sea in the northwestern Pacific and the key channel connecting the North Pacific and northern Indian Ocean. When the Kuroshio flows northward along the Philippine Islands, signals from the western Pacific are transmitted to the South China Sea through the Luzon Strait, thus affecting the hydrodynamic environment of the South China Sea. We analyze the spatial distribution and low-frequency variability of subsurface salinity in the South China Sea, and try to explain the relationship between the subsurface salinity in the South China Sea and the Pacific Decadal Oscillation (PDO); we also explore the change of the subsurface salinity in recent years. The results are as follows. 1) Driven by the subsurface cyclonic circulation, subsurface salinity at about 24-26 σ_θ decreases gradually from north to south counterclockwise starting from the Luzon Strait. 2) The low-frequency variability of subsurface salinity is significantly correlated with PDO. When the PDO is in the positive phase, the westward transport in the Luzon Strait is strengthened and the subsurface salinity increases. When the PDO is in the negative phase, the westward transport in the Luzon Strait is weakened and the subsurface salinity decreases, and the salinity change is directly affected by the horizontal circulation. 3) In recent years, the subsurface salinity has shown a trend of refreshing from 2006 to early 2014, and then increasing from 2014 to early 2017, lagging behind the PDO by about 10 months. Since 2017, the salinity decreased again.

Key words: subsurface salinity, low frequency variability, Pacific Decadal Oscillation (PDO), advection, South China Sea

Xiangpeng WANG,Yuhong ZHANG,Aimei WANG,Wei ZHAO,Yan DU. Low-frequency variability of subsurface salinity in the South China Sea and its relationship with the Pacific Decadal Oscillation[J].Journal of Tropical Oceanography, 2019, 38(4): 1-9.

Figures/Tables 6

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