热带海洋学报 ›› 2017, Vol. 36 ›› Issue (4): 18-24.doi: 10.11978/2016101CSTR: 32234.14.2016101

所属专题: 南海专题

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近二十年南海表层海水的盐度淡化及其机制*

傅圆圆1,2(), 程旭华1(), 张玉红1, 严幼芳1, 杜岩1   

  1. 1. 热带海洋环境国家重点实验室(中国科学院南海海洋研究所), 广东 广州 510301
    2. 中国科学院大学, 北京 100049
  • 收稿日期:2016-10-19 修回日期:2017-01-02 出版日期:2017-07-20 发布日期:2017-07-26
  • 作者简介:

    作者简介:傅圆圆(1990—), 女, 山东省潍坊市人, 硕士研究生, 主要从事物理海洋学研究。E-mail:yuanf@scsio.ac.cn

  • 基金资助:
    国家自然科学基金(41522601、41230962、41276025、41506019);热带海洋环境国家重点实验室自主项目(LTOZZ1501);广州市珠江科技新星项目(201506010036)

The freshening trend of surface salinity in the South China Sea in recent two decades and its mechanism

Yuanyuan FU1,2(), Xuhua CHENG1(), Yuhong ZHANG1, Youfang YAN1, Yan DU1   

  1. 1. State Key Laboratory of Tropical Oceanography (South China Sea Institute of Oceanology, Chinese Academy of Science), Guangzhou 510301, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-10-19 Revised:2017-01-02 Online:2017-07-20 Published:2017-07-26
  • Supported by:
    National Natural Science Foundation of China (41522601,41230962, 41276025, 41506019);The Open Project Program of State Key Laboratory of Tropical Oceanography (LTOZZ1501);The Pear River S&T Nova Program of Guangzhou (201506010036)

摘要:

南海北部航次观测资料显示南海北部表层盐度在2004—2012年期间缓慢降低, 2012年盐度达到最低。客观分析数据EN4(the UK Met Office EN.4.0.2 objective analyses)以及OFES(ocean general circulation model for the Earth Simulator)模式结果都显示南海表层海水盐度在1993—2014年有淡化趋势, 最显著区域位于吕宋岛以西和南海南部。盐度收支分析表明淡水强迫在吕宋岛以西海域起主要贡献, 而水平平流输运主导南海西部的表层盐度变化。吕宋岛以西表层盐度的降低与近年来沃克环流加强引起的夏季强降雨增加有关。

关键词: 南海, 表层盐度, 淡化, 降雨, 水平平流, 海气相互作用

Abstract:

In situ hydrographic data of sea surface salinity (SSS) revealed a freshening trend in the northern South China Sea (SCS) during 2004—2012, which was the freshest in 2012. Such freshening was also found in the UK Met Office EN4 objective analysis product and the ocean general circulation model for the Earth Simulator (OFES) output during 1993-2014, particularly west of Luzon Island and in the southeastern SCS. The salinity budget analysis in the upper layer indicated that the fresh water forcing and horizontal salinity advection contributed to the trends of SSS west of Luzon Island and in the western SCS, respectively. The excessive precipitation in summer accounted for the decrease of SSS to a great extent west of Luzon Island, which was associated with the strengthening trend of the Walker Circulation.

Key words: South China Sea, sea surface salinity variability, freshening, precipitation, horizontal salinity advection, air-sea interaction

中图分类号: 

  • P731.12