中山大学学报自然科学版 ›› 2018, Vol. 57 ›› Issue (3): 34-43.

• 论文 • 上一篇    下一篇

中南半岛春季土壤湿度对南海及其周边地区夏季降水的影响

游家兴1,2,李江南1,赵杨洁1,毛江玉3   

  1. 1. 中山大学大气科学学院∥广东省气候变化与自然灾害研究重点实验室,广东 广州 510275;
    2. 中国三峡建设管理有限公司,四川 成都 610041;
    3. 中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室,北京 100029
  • 收稿日期:2017-03-29 出版日期:2018-05-25 发布日期:2018-05-25
  • 通讯作者: 李江南(1968年生),男;研究方向:气候分析与模拟;E-mail: essljn@mail.sysu.edu.cn

Effect of spring soil moisture in Indo-China Peninsula on summer precipitation over the South China sea and surrounding area

YOU Jiaxing1,2 , LI Jiangnan 1, ZHAO Yangjie1 , MAO Jiangyu3   

  1. 1 School of Atmospheric Sciences∥Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou 510275,China;
    2. China Three Gorges Projects Development Co., Ltd., Chengdu 610041,China;
    3.State Key Laboratory of Numerical Simulation of Atmospheric Sciences and Earth Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,China
  • Received:2017-03-29 Online:2018-05-25 Published:2018-05-25

摘要:

通过SVD分析等统计方法对中南半岛春季土壤湿度对南海及其周边地区夏季降水的影响进行了诊断分析,结果表明:中南半岛春季土壤湿度与西太平洋夏季降水呈现显著正相关,而与东印度洋夏季降水为显著负相关。中南半岛春季土壤湿度表现正异常时,西太平洋夏季降水增加;东印度洋夏季降水减少;正异常时,局地的蒸发偏大,近地面湿度增大,地面到大气的潜热通量增加;地表反照率减小,对太阳短波辐射的吸收更加强烈,向上的短波辐射相应减少,导致近地面温度降低,感热通量和长波辐射减少,使得海陆热力差异减小,有利于季风加强,季风爆发时间偏早,从而导致从东印度洋的水汽输往西太平洋,增加西太平洋的降水;反之亦然。

关键词: 中南半岛, 南海, 土壤湿度, 夏季降水

Abstract:

In this paper, the influence of the spring soil moisture in the Indo-China Peninsula was analyzed on summer precipitation over the South China Sea and surrounding area by using statistical methods like SVD. The results indicate that there exists obvious positive correlation between soil moisture and summer precipitation over the western Pacific Ocean and negative correlation between soil moisture and summer precipitation over the eastern Indian Ocean. Summer precipitation increased over the western Pacific and decreased over the eastern Indian Ocean when positive (negative) anomaly in soil moisture occurred over the Indo-China Peninsula. When soil moisture anomaly over the Indo-China Peninsula was positive, local evaporation increased, near surface humidity decreased, latent heat flux from ground to atmosphere increased, surface albedo decreased, the absorption of solar shortwave radiation was strengthened, and upward shortwave radiation correspondingly decreased. This resulted in that near surface temperature decreased, sensible heat flux and long-wave radiation decreased, and the sea-land thermal difference reduced, which enhanced the monsoon and caused monsoon to occur earlier. Furthermore, that enhanced the transportation of water vapor from the eastern Indian Ocean to the western Pacific Ocean, and increased the precipitation in the western Pacific. The increase in near surface temperature will lead to the opposite precipitation mode, and vice versa.

Key words: Indo-China Peninsula, the South China Sea, soil moisture, summer precipitation

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