摘要
利用2007年3月2008年2月CloudSat与CALIPSO卫星相结合的云分类产品2B-CLDCLASS-LIDAR数据,分析了中国西部及周边地区云的垂直结构特征。研究结果表明,各地区单层云出现频率均大于多层云,天山山脉、祁连山脉中西段多层云出现频率全年均大于周围地区;所有云的云顶和云底高度在不同高度的出现频率具有明显的区域和季节变化特征,且云顶高度的季节变化较云底高度显著;西北地区各云层高度的季节变化不明显,青藏高原(下称高原)地区各云层高度在冬、夏季反差较大;单层云的平均厚度超过2 km,2层云和3层云的厚度基本在1~2 km;云层间距以2层云最大,且高原地区云层间距季节变化较西北地区明显;高原南坡夏季冰云出现频率较多,其他地区冬、春季冰云出现较多,除高原南坡外,冬季冰云出现频率均在80%以上。
Cloud vertical structure over western China and its neighborhood was analyzed using the 2B- CLDCLASS- LIDAR data of CloudSat /CALIPSO during the period from March 2007 to February 2008. The results show that the occurrence frequency of single-layer cloud is greater than multi-layer cloud over the whole region,multi-layer cloud occurrence frequency for Tianshan Mountains and the middle-west of Qilian Mountains is higher than the surrounding area throughout the year. Cloud top and base heights of all clouds change apparently with the seasons and regions,and the seasonal variation of cloud top height is more significant than cloud base height.The cloud height of each layer has no remarkable seasonal variation in Northwest region,however,the significantly distinct in Qinghai-Xizang Plateau. The average of cloud thickness is greater than 2 km for single-layer cloud and ranges from 1 km to 2 km for double-layer and three-layer clouds. The vertical distance of double-layer clouds is greater than other consecutive layers,and the seasonal variation of consecutive layers in Qinghai-Xizang Plateau is more significant than Northwest region. The occurrence frequency of ice phase cloud in summer over the south slope of Qinghai-Xizang Plateau is greater than other seasons. However,more ice clouds over other regions are present in winter and spring. Apart from the south slope of Qinghai-Xizang Plateau,the occurrence frequency of ice cloud in winter is greater than 80% for other regions.
出处
《高原气象》
CSCD
北大核心
2014年第4期977-987,共11页
Plateau Meteorology
基金
国家公益性行业(气象)科研专项(GYHY201206004)
国家自然科学基金项目(41375031
41305027)
兰州大学中央高校基本科研业务费专项资金资助(lzujbky-2014-106)
