摘要
利用2006年6月至2008年5月CALIOP（Cloud-Aerosol LIdar with Orthogonal Polarization）水平分辨率25km云层产品来研究中国地区的卷云分布特征。所采用的3条基于卷云气候态的质量控制标准能够有效的剔除CALIOP云种分类产品中判别误差。通过卷云水平分布的研究发现,区域性强烈的辐合上升气流和丰富的水汽导致中国南部靠近热带辐合带（ITCZ）的热带地区卷云具有约60%左右的最大发生频率。沿青藏高原抬升的暖湿空气能够产生很多地形型卷云,从而导致干旱的青藏高原东北坡出现了相对较大约30%~40%的卷云覆盖。ITCZ和季风的时空迁移主导了卷云在纬度上的季节性分布特征,同时也导致青藏高原东北坡的相对高值主要出现在春冬季节。沿纬度的卷云垂直分布的变化揭示出低纬度卷云的云顶高度更多的集中在16km附近,这主要是因为对流层顶限制了卷云的发展。通过对多层卷云系统的研究揭示出伴随不同云种的系统的水平分布特征与各种云种的随纬度的分布密切联系。除伴随卷云发生的多层卷云系统以外,青藏高原东北部的相对高值主要是伴随海拔较高的高积云的系统的发生导致的。
The distribution of cirrus clouds over China is presented using the Earth-orbiting Cloud-Aerosol Lidar with Orthogonal Polarization（CALIOP）Level 25 km（horizontal resolution）cloud layer product from June 2006 to May 2008.The three quality control standards based on cirrus climatologies can be effectively used to eliminate the cirrus false identifications in this product.From the analysis of cirrus cloud horizontal distribution,the authers attribute the highest occurrence frequency of cirrus clouds of about 60% in the south of China near Intertropical Convergence Zone（ITCZ）to the strongly rising air and rich water vapor.The terrain-induced cirrus clouds produced by uplifted relatively warm and moist air on the Qinghai-Xizang Plateau cause the relatively high occurrence frequency of about 30%-40% on the northeast slope of Qinghai-Xizang Plateau.The migrations of ITCZ and monsoon induce the seasonal latitudinal movement of cirrus over China,and the relatively high cirrus on the northeast slope of Qinghai-Xizang Plateau relatively which occurs in winter and spring as well.The latitudinal variation of vertical distribution of cirrus displays that the cirrus clouds at low-latitude center around 16 km due to the limit of tropopause.The analysis shows that the horizontal distribution of multilayered cirrus cloud systems with different kinds of cloud is closely associated with the latitudinal distribution of different kinds of cloud.In addition to the multilayered cirrus cloud systems occurring with cirrus,the relatively high value on the northeast of Qinghai-Xizang Plateau is mainly contributed to the occurrence of systems with high altocumulus.
出处
《气候与环境研究》
CSCD
北大核心
2011年第3期301-309,共9页
Climatic and Environmental Research
基金
国家自然科学基金资助项目40875084,国家自然科学基金青年科学基金项目40705012
关键词
卷云
星载激光雷达
青藏高原
cirrus
spaceborne-lidar
Qinghai-Xizang Plateau
