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| 南海夏季风异常活动的前期特征 |
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张勇1,2, 谢安1, 戴念军3
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1.北京大学大气科学系, 北京, 100871;2.民航福州空管站, 福建, 福州, 350026;3.民航石家庄空管站, 河北, 石家庄, 050802
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| 摘要: |
| 应用1979-1999年NOAA卫星月平均OLR资料及1950-1999年NCEP/NCAR再分析的月平均资料,采用合成分析的方法对南海夏季风爆发前一年10月-次年4月的异常特征进行讨论,并做信度检验。结果表明,在季风爆发的前期,大气环流和海温的异常与南海夏季风的异常关系密切。不同因子与南海夏季风异常发生最佳相关的时间及持续的程度并不完全一致,从所选取与南海夏季风爆发密切相关的关键区可见:OLR在初春、纬向风速和垂直速度在整个前期的异常与南海夏季风的异常存在极强的相关性。在强(弱)南海夏季风年的前期,热带海温基本呈La Nina(E1 Nino)型分布,其中在12月的海温距平分布与来年南海夏季风的强弱关系最为密切。 |
| 关键词: 南海夏季风 异常活动 前期特征 大气环流异常 |
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| 基金项目:国家科技部攀登项目A“南海季风试验研究”资助 |
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| PRECEDING FEATURES ASSOCIATED WITH THE ANOMALOUS SUMMER MONSOON OVER THE SOUTH CHINA SEA |
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ZHANG Yong1,2, XIE An1, DAI Nian-jun3
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1.Department of Atmospheric Sciences, Peking University, Beijing 100871, China;2.China Civil Aviation Fujian Administration, Fuzhou 350026, China;3.China Civil Aviation Hebei Administration, Shijiazhuang 050802, China
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| Abstract: |
| This study examines the anomalous features from previous October to present April preceding the onset of the summer monsoon over the South China Sea (SCS) using the monthly mean NCEP/NCAR reanalysis data for the period 1950-1999 and OLR data from NOAA for the period 1979-1999. Composite analyses show that sea surface temperature and general circulation anomalies are closely related to the onset of the. The occurrence and duration of the greatest correlations differ with factors. The correlations of the SCS summer monsoon onset with OLR, zonal wind velocity and vertical motion are very significant. The strong (weak) SCS summer monsoons are preceded by La Nina (El Niño) pattern, and December is the period when the close correlation best exhibits. |
| Key words: SCS Summer monsoon anomalous activity preceding features general circulation anomalies |