不同资料揭示南海夏季风爆发特征的比较

朱亚芬; 李弋林; 钱维宏

不同资料揭示南海夏季风爆发特征的比较

北京大学地球物理系, 北京, 100871

基金项目: 国家科技部攀登A"南海季风试验研究"和国家自然基金(49975023)

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出版历程
- 收稿日期: 1999-11-12
- 修回日期: 2000-04-17

COMPARISION OF THE SCS SUMMER MONSOON ONSET-CHARACTERISTICS DERIVED FROM DIFFERENT DATASETS

Department of Geophysics, Pcking University, Beijing 100871, China

摘要

摘要: 应用1980～1995年5天平均的CMAP降水资料、美国 NMC 850hPa风、卫星反演的向外长波辐射(OLR)和上部对流层水汽亮温(BT)等资料分析比较了南海夏季风爆发前后的基本特征。结果发现:BT能够反映南海夏季风的爆发及其与周围地区降水的关系,但局地降水信息的反映不够具体;OLR能够比较好地反映热带海洋上的降水,但陆地上的低值OLR可能受到地形的影响;仅仅850hPa风场不能完全确定夏季风的爆发。南海季风转换区域定义在南海的中北部比较合适,这是因为南海夏季风爆发前就存在着长年位于南海南部的热带海洋对流性雨带;南海夏季风爆发后西南季风气流和季风雨带从印度洋经孟加拉湾和南海伸向西北太平洋,开始了南亚和东亚夏季风的爆发过程。
- 南海 /
- 夏季风 /
- 爆发特征 /
- 资料比较
Abstract: In this study,the basic characteristics of South China Sea (CSC) summer monsoon onset are analyzed and compared using different datasets. Those include the Climate Prediction Center (CPC) Merged Analysis of Precipitation (CMAP),National Meteorological Center global wind analysis,outgoing longwave radiation (OLR),and upper-tropospheric water vapor band brightness temperature (BT) observed with NOAA polar orbiting satellites. Results show that the BT can reflect some characteristics of SCS monsoon onset but it can not well depict the some information of local precipitation more details. OLR can reflect well the precipitation that lied over oceans but the low OLR over lands may be influenced by low surface temperature. 850 hPa wind alone can not determine the onset of summer monsoon. For describing the onset of SCS summer monsoon,the domain of SCS is reasonable to be determined in central-north part of SCS because the annual precipitation and convection continue to appear in the south part of SCS for the whole year. After the onset of SCS summer monsoon,southwesterly monsoon flow and monsoon rainbelt prevail from Indian Ocean through Bay of Bengal and SCS to northwest Pacific which is a mark of summer monsoon onset over both South Asia and East Asia.
- South China Sea /
- summer monsoon /
- onset characteristic /
- data comparison

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参考文献(15)

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