摘要:利用CloudSat和CALIPSO卫星云产品数据分析了2007年1月至2010年12月中国华北(陆地A1)、日本海(近海A2)和太平洋地区(远海A3)的中云(高积云Ac和高层云As)分布特征.3个地区全年中云平均发生概率近1/3,As的发生概率高于Ac.As高度主要位于4～8 km,Ac则集中于高度3.5～5.5 km范围,中云垂直及水平尺度从陆地向深海逐步增加.位于对流层中部的中云其所处位置温度使冰晶和过冷水状态的液态水能够同时存在.统计结果表明As中冰态粒子含量占绝对多数,Ac中液态和冰态各占比例彼此相当.As与Ac中IER(冰晶有效粒子半径)分布与高度均呈负相关关系,IER谱分布主要范围为35～80 μm.As中LER(液水有效粒子半径)与高度呈正相关特征,但Ac中这一特征明显减弱,Ac及As中LER主要分布范围为5～15 μm.As及Ac中IWC及LWC谱分布比较分散,与高度之间的相关性亦不明显.
关键词:CloudSat资料/
CALIPSO资料/
高层云/
高积云/
物理属性
Abstract:There has been relatively less research on the physical properties of mid-level clouds. In this study, the CloudSat and CALIPSO satellite cloud data from Jan 2007 to Dec 2010 for the North China (area A1), Sea of Japan (area A2), and the Pacific (area A3) was used to analyze the physical characteristics of mid-level clouds (As and Ac). The occurrences of middle level clouds are around 1/3 over all the three areas. The As occurs higher (4-8 km) than the Ac (3.5-5.5 km). The average size of mid-level clouds increases from land to sea. Temperature in the middle troposphere supports the condition for mid-level clouds to contain both ice and supercooled liquid particles. Our statistical results indicate that ice particles dominate in As, while the proportions of liquid and ice particles are similar in Ac. The IER (Ice Effective Radius) of As and Ac varied from 35 to 80 μm and the height and IER of As and Ac ice particles were negatively correlated. The LER (Liquid Effective Radius) of As is highly positively correlated with height, but this correlation is weakened in Ac. The LER values in Ac and As mainly range between 5-15 μm. The IWC and LWC of As and Ac show no obvious correlation with height.
Key words:CloudSat data/
CALIPSO data/
Altostratus/
Altocumulus/
Physical property
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