doi:  10.3878/j.issn.1006-9895.1610.16138
中国东部暖季对流云与层状云的比例关系

The ratio of convective clouds to stratiform clouds during warm seasons in eastern China
摘要点击 2026  全文点击 79  投稿时间:2016-02-23  最后修改时间:2016-10-08
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基金:  财政部/科技部公益类行业专项(201306068);国家自然科学基金(41475069)
中文关键词:  对流云,层状云,比例关系
英文关键词:  convective clouds, stratiform clouds, the ratio of convective clouds to stratiform clouds
           
作者中文名作者英文名单位
高翠翠GAO Cuicui解放军理工大学气象海洋学院
李昀英LI Yunying解放军理工大学气象海洋学院
寇雄伟KOU Xiongwei94595部队
孙国荣SUN Guorong解放军理工大学气象海洋学院
引用:高翠翠,李昀英,寇雄伟,孙国荣.2017.中国东部暖季对流云与层状云的比例关系[J].大气科学
Citation:GAO Cuicui,LI Yunying,KOU Xiongwei,SUN Guorong.2017.The ratio of convective clouds to stratiform clouds during warm seasons in eastern China[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      基于1985~2011年逐时地面台站观测云资料,分析了对流云和层状云及其比例关系的时空演变特征,结合逐日融合降水资料研究了对流云和层状云与季风雨带的对应关系。结果表明,中国东部暖季(5~9月)对流云发生频率平均为15.4%,层状云为30.0%。对流云与层状云发生频率的比例在两广地区、海南东部和贵州大部分地区大于1,其它地区均小于1。伴随季风的北进南退,层状云发生频率和云量中心均与降水中心对应,且层状云云带与季风雨带位置吻合,随时间的演变也相同,说明季风雨带主要由层状降水构成,对流云发生频率和云量大值中心则位于季风雨带南侧。对流云和层状云发生频率/云量的变化在华南地区和江淮流域呈显著负相关,云的类型主要由大气稳定度决定。对流云和层状云发生频率在华北地区呈显著正相关,水汽是形成云的决定因素。就降水频率而言,华南地区层状云降水和对流云降水各占一定的比例,而江淮流域和华北地区层状云降水频率更大。
Abstract:
      Based on hourly station observational cloud data in China from 1985 to 2011, temporal and spatial distributions of convective and stratiform clouds and their ratio are analyzed. Combined with merged daily precipitation data, the corresponding relations between convective (stratiform) clouds and monsoon rain belt are studied. The results indicate that in warm seasons(May-September), the averaged occurrence frequency of convective clouds is 15.4%, and of stratiform clouds is 30.0% in eastern China. The ratio of occurrence frequency between convective clouds and stratiform clouds is greater than 1 in Guangdong, Guangxi, eastern Hainan and most parts of Guizhou province, while it is less than 1 in other regions. The maximum center of occurrence frequency and cloud amount of stratiform clouds match well with the center of the monsoon rainfall, and their advance with the time is similar as that of the monsoon rain belt. This phenomenon indicates that the precipitation on the monsoon rain belt is mainly caused by the stratiform clouds. On the other hand, the maximum center of occurrence frequency and cloud amount of convective clouds locate to the south of monsoon rain belt. In south China and Yangtze-Huaihe valley, the occurrence frequency and cloud amount of convective clouds have opposite change with those of the stratiform clouds because the instability decides the cloud types. When the instability is stronger, the convective clouds increase while the stratiform clouds decrease. However in north China, the convective clouds and stratiform clouds have positive correlation because the water vapor is the decisive factor. When the water vapor increases in monsoon season, both the occurrence frequency and cloud cover of the convective clouds and stratiform clouds increase. If only consider the rainfall frequency, the convective precipitation and stratiform precipitation coexist in south China, but the stratiform precipitation dominates the Yangtze-Huaihe valley and north China.
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