利用Argo和Aquarius卫星观测研究热带南印度洋海表盐度的季节变化

doi:10.11978/2017002

Abstract

Abstract:

Based on the monthly mean data of Argo and Aquarius satellite observations, we analyze the seasonal variation of sea surface salinity (SSS) in the tropical South Indian Ocean. The results show that the SSS has significant seasonal variation characteristics, that is, the SSS is lower in winter and higher in summer in the region of 60°-80°E, 5°-15°S. However, the center of anomalous SSS does not correspond to the center of anomalous precipitation. The seasonal variation of precipitation cannot explain the seasonal variation of SSS. Salinity budget analysis indicates that the ocean dynamics contribute to the seasonal variation of SSS. During the summer half of the year, the SSS increasing is attributed to the meridional advection transport high salinity from the equatorial region to the South Indian Ocean, as well as the entrainment strengthening from April to May. In the winter half of the year, precipitation increases, the northward currents transport low-salinity water induced by increasing precipitation to the study region, which favors the accumulation of low-salinity water in the region; at the same time, the westward zonal advection transports the low-salinity water from the Southeastern Indian Ocean to the west, both of which have important contributions to the decreasing SSS.

Key words: sea surface salinity, seasonal variation, salinity budget, freshwater flux, horizontal advection, tropical South Indian Ocean

CLC Number:

P731.12

Qiwei SUN, Yan DU, Yuhong ZHANG. Seasonal variability of sea surface salinity in tropical Southern Indian Ocean based on Argo and Aquarius observations[J].Journal of Tropical Oceanography, 2017, 36(4): 25-34.

Figures/Tables 6

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References 30

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Seasonal variability of sea surface salinity in tropical Southern Indian Ocean based on Argo and Aquarius observations

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