中文摘要：

应用MTSAT红外云图、NCEP再分析资料、船载微波辐射计和自动气象站资料对2014年12月22日发生在赤道中太平洋地区的一次中β尺度对流云团降水过程进行研究,揭示了热带对流云团的垂直结构及演变特征。分析表明：（1）中β尺度对流云团的生成和发展与低层切变线有直接关系,云团发展过程呈现尺度小、发展快、移动快的特点。（2）该对流云团向西倾斜的不对称结构造成了降水在东西向的不均匀分布。（3）云团中心与强降水区相互对应,并伴有瞬时大风、低能见度现象。云团中心附近呈现低层存在逆温层、高层多个“冷团”的现象,与中纬度对流降水“中间暖、两头冷”的特点迥然不同。

英文摘要：

By using MTSAT infrared cloud image, NCEP reanalysis data and ship observations data, and automatic station data, the vertical structure and evolution features of a meso-β scale convective cloud cluster causing a heavy rainfall in the central equatorial Pacific on Dec. 22, 2014 were analyzed. Results show that ： （ 1 ） The genesis and development of the meso-β scale convective cloud cluster are re- lated with the shear line in low layer directly, and its development process is charasterized by small scale, quick development and fast movement. （2） The convective cloud cluster had an asymmetric struc- ture tilting to the west, which may be the reason for the uneven distribution of the rain. （3） The center of convective cloud cluster is consistent with the strong rainfall accompanying with instantaneous high wind speed and low visibility. A warm core occurs in the low layer near the center of the convective cloud clus- ter while several cold cores are found in the high layer.