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热带大气季节内振荡对华南前汛期降水的影响
引用本文:章丽娜,林鹏飞,熊喆,等.热带大气季节内振荡对华南前汛期降水的影响[J].大气科学,2011,35(3):560-570.
作者姓名:章丽娜  林鹏飞  熊喆  
作者单位:1.中国气象局培训中心, 北京,100081
基金项目:国家重点基础研究发展计划项目2010CB950903、 2009CB421100, 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自由探索, 国家自然科学基金资助项目40906012, 国家高技术研究发展计划项目2010AA012303
摘    要:本文基于实时的热带大气季节内振荡(MJO)指数和中国台站降水资料,研究了MJO对中国华南前汛期(4~6月)降水的影响.结果表明,随着MJO的活跃中心从印度洋进入西太平洋,华南地区的降水由偏多转为偏少.最显著的降水正负异常分别位于第4位相和第7位相,其区域平均的最大正负异常值相对于气候平均值的变化约为17%和11%.与降...

关 键 词:热带大气季节内振荡  前汛期  降水  华南  实时热带大气季节内振荡指数

Impact of the Madden-Julian Oscillation on Pre-flood Season Precipitation in South China
Zhang Lin,Lin Pengfei,Xiong Zhe and et al.Impact of the Madden-Julian Oscillation on Pre-flood Season Precipitation in South China[J].Chinese Journal of Atmospheric Sciences,2011,35(3):560-570.
Authors:Zhang Lin  Lin Pengfei  Xiong Zhe and
Institution:1.China Meteorological Administration Training Center, Beijing,1000812.State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing,1000293.Key Laboratory of Regional Climate-Environment for East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing,100029
Abstract:Impact of the Madden-Julian Oscillation (MJO) on pre-flood season precipitation in South China is investigated based on a real-time MJO index and observed daily rainfall from gauge stations. It is shown that the rainfall patterns change from enhanced to suppressed in South China at intraseasonal timescales as the MJO moves from the Indian Ocean to the western Pacific. The most significant positive and negative anomalies are found in phase 4 and phase 7, respectively. The maximum positive and negative anomalies of regional mean rainfall are 17% and 11% relative to the climatological regional mean, respectively. Such different rainfall regimes are associated with the corresponding changes in large-scale background fields such as the western Pacific subtropical high (WPSH), moisture, and vertical motion. In phase 4, when the MJO is mainly over the Indian Ocean, the WPSH shifts farther westward, the moisture and upward motion in South China are increased, such environment is in favor of rainfall enhancement. In contrast, in phase 7, when the MJO enters the western Pacific, the WPSH retreats eastward, the moisture and upward motion in South China are decreased, such environment is in favor of rainfall suppression.
Keywords:Madden-Julian Oscillation (MJO)  pre-flood season  precipitation  South China  Real-time Multivariate MJO (RMM) index
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