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Large-scale low-frequency rainfall regimes and their transition modes in summertime over China

机译：中国夏季大规模低频降水模式及其转换方式

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摘要

Seven large-scale low-frequency rainfall regimes (LFRRs) in summertime are identified for China in a 10-dimensional phase space by using a 40-year daily precipitation dataset. Corresponding to the local extrema of observed probability density in phase space, the LFRRs are characterized by the persistence and transitions that reflect the spread and jump features of low-frequency rainfall centers. The LFRRs are generally consistent with summer monsoon rainbelts on the intraseasonal timescale, and there exist the preferred transition relationships between the LFRRs. Four LFRRs' transition modes (LFRRTMs), which are the dominant components of the interannual and intraseasonal variability of summer rainfall in China, are further induced. Analyses of atmospheric circulation system show that the anomalies of the subtropical high over the western Pacific (SHWP) and blockings in mid-high latitudes, the low-latitude circulation anomalies, and the wavetrains over the East Asia-Pacific region (EAPWs), play crucial roles in the occurrence and transitions of the LFRRs. Moreover, the evolution of the SHWP and blockings, the distribution and movement of the EAPWs, and the intraseasonal variability of the East Asian-Pacific jet stream may be principal factors of the formations of the LFRRTMs.
机译：通过使用40年的日降水量数据集，在10维相位空间中确定了中国的七个夏季大型低频降水模式（LFRR）。 LFRR与相空间中观测到的概率密度的局部极值相对应，其特征是持续和过渡，反映了低频降雨中心的扩展和跳跃特征。 LFRRs在季节内尺度上通常与夏季风季雨带一致，并且在LFRRs之间存在优选的过渡关系。进一步推导了四个LFRRs过渡模式（LFRRTMs），它们是中国夏季降水的年际和季节内变化的主要成分。大气环流系统的分析表明，西太平洋副热带高压（SHWP）和中高纬度的阻塞，低纬度环流异常以及东亚-太平洋区域（EAPWs）的波列在发挥作用在LFRR的发生和过渡中起着至关重要的作用。此外，SHWP和阻塞的演变，EAPW的分布和运动以及东亚-太平洋射流的季节内变化可能是LFRRTM形成的主要因素。

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