基于CERES资料的东亚地区单层卷云物理特性时空分布特征

Spatial and Temporal Distribution of Single Layer Cirrus Physical Properties Based on CERES Data in East Asia

利用2003—2016年的CERES SSF(Clouds and the Earth’s Radiant Energy System Single Scanner Foorprint)数据,对东亚不同区域的单层卷云物理特性进行研究。结果表明:(1)单层卷云量在东亚地区为25%~46%,低值区主要分布在青藏高原和云贵高原。单层卷云云厚多为1.2~2.4 km,除南部地区外,东亚其他区域的单层卷云在冬季较厚。(2)东亚地区单层卷云冰粒子等效半径范围集中在22~32μm,东部海域年平均值在14 a中均为最大。冰水柱含量范围集中在12~30 g/m^(2),西部地区为主要高值区,14 a的年平均值均>24 g/m^(2)。(3)单层卷云光学厚度的高值区(1.7~2.1)分布在青藏高原及其附近,低值多出现在西太平洋上空。东亚5个子区域的云光学厚度均在春季较大。

The data from CERES SSF(Clouds and the Earth’s Radiant Energy System Single Scanner Foorprint) were used to study the distribution of single layer cirrus physical properties in different regions of East Asia from 2003 to 2016.The results show that:(1) The cloudiness of single layer cirrus is 25%~46% in East Asia,and the low value areas are main distributed in the Qinghai-Tibet Plateau and Yunnan-Guizhou Plateau;the cloud thickness of single-layer cirrus is 1.2~2.4 km,the cloud thickness is relatively thick in winter in the whole region except the South.(2)The equivalent radius of ice particles of single layer cirrus is concentrated in the range between 22 and 32 μm,and the annual mean values of the East China Sea are the largest in the 14 years. The ice water column content is concentrated in the range of 12~30 g/m^(2). The west region is the main high value region,the annual mean values are more than 24 g/m^(2) in the 14 years.(3)The high optical depth(1.7~2.1)of the single layer cirrus is distributed in and around the Qinghai-Tibet Plateau,and low values tend to occur over the western Pacific. The cloud optical depth of the five sub-regions of East Asia are all larger in spring.