青藏高原上空对流云特征的初步分析

利用常规地面观测资料、高空资料以及卫星云图资料,通过2010年7月与2011年7月的云图对青藏高原及周边地区对流云和中尺度对流系统的活动进行初步研究,分析了青藏高原上空对流云的特征.结果表明:①青藏高原上的对流过程是在特定的环流背景下受西风带500 hPa低槽、700 hPa切变线、850 hPa低涡以及地面图上中尺度低涡和地面静止锋的共同影响造成的;②对流云产生不仅与水汽条件有关,还与不稳定层结条件和抬升力条件即触发机制有关;③对流云的发生发展具有明显的日变化.

Preliminary Analysis of the Characteristics of Convective Clouds Over the Qinghai-Tibet Plateau

By using of conventional ground observations,aerial and satellite image data information,through July 2010 and July 2011 cloud,the convective activity and mesoscale convective systems of Tibetan Plateau and surrounding areas were researched,and the characteristics of convective clouds over Qinghai-Tibet Plateau were analyzed. The results showed that：①the convection on the Qinghai-Tibet Plateau is affected by westerly trough 500 hPa circulation in a particular context,the combined effect of 700 hPa shear line,850 hpa vortex and the figure on the ground and ground-scale vortex caused by stationary front;②the producing of convective clouds are not only related to water vapor,but also related to unstable stratification conditions and uplift force conditions such as trigger mechanisms;③the development of clouds also has obvious diurnal variation.