Dust aerosol effects on cirrus and altocumulus clouds in Northwest China
Dust aerosol effects on cirrus and altocumulus clouds in Northwest China
复制标题
DOI：
10.1007/s13351-015-4116-9
复制
发表时间：
2015-11
影响因子：
3.2
通讯作者：
Wencai Wang;L. Sheng;H. Jin;Yongqing Han
中科院分区：
文献类型：
--
作者：
Wencai Wang;L. Sheng;H. Jin;Yongqing Han
利用2007年3 - 5月的CALIPSO、Aqua和CloudSat卫星资料，研究了沙尘气溶胶对中国西北地区卷云和高积云特征的影响。沙尘云是指与沙尘气溶胶混合或存在于沙尘气溶胶环境中的云，而纯云是指无尘环境中的云。高积云光学厚度（OPD）、云液态水路径（LWP）、云冰水路径（IWP）、云有效粒子半径（Re）和云有效粒子直径（De）的平均值分别为6.40、40.23 g m-2、100.70 g m-2、8.76μm和40.72μm。对于纯高积云，相应的平均值分别为9.28，76.70 g m-2，128.75 g m-2，14.03μm和48.92μm。这些结果表明，由于沙尘气溶胶的影响，OPD，LWP，IWP，Re和De分别降低了31%，48%，22%，38%和17%。此外，沙尘气溶胶对液相高积云的影响大于对冰相高积云的影响。尘埃卷云的OPD、IWP和De的平均值分别为5.11、137.53 g m-2和60.44μm。与此相反，纯卷云的平均值分别为6.69，156.17 g m-2和66.63μm，OPD减少24%，IWP减少12%，De减少9%。这些结果表明，沙尘气溶胶可以显著改变云的性质，导致西北地区高积云和卷云的OPD，LWP和有效粒子大小的减少。
Dust aerosol effects on the properties of cirrus and altocumulus cloud in Northwest China were studied for the period March–May 2007 by using the satellite data of Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO), Aqua, and CloudSat. Dusty clouds were defined as those mixed with dust aerosols or existing in dust aerosol conditions, while pure clouds were those in a dust-free environment. For dusty altocumulus clouds, the mean values of cloud optical depth (OPD), cloud liquid water path (LWP), cloud ice water path (IWP), cloud effective particle radius (Re), and cloud effective particle diameter (De) were 6.40, 40.23 g m-2, 100.70 g m-2, 8.76μm, and 40.72μm, respectively. For pure altocumulus clouds, the corresponding mean values were 9.28, 76.70 g m-2, 128.75 g m-2, 14.03μm, and 48.92μm, respectively. These results show a significant decrease of OPD, LWP, IWP,Re, andDeof approximately 31%, 48%, 22%, 38%, and 17% because of the effects of dust aerosols. Moreover, the effects of dust aerosols on liquid-phase altocumulus clouds were greater than on ice-phase altocumulus clouds. Regarding dusty cirrus clouds, the mean values of OPD, IWP, andDewere 5.11, 137.53 g m-2, and 60.44μm, respectively. In contrast, the mean values were 6.69, 156.17 g m-2, and 66.63μm, respectively, for pure cirrus clouds, with a 24% decrease in OPD, a 12% decrease in IWP, and a 9% decrease inDe. These results indicate that dust aerosols can significantly change cloud properties, leading to a reduction of OPD, LWP, and effective particle size for both altocumulus and cirrus clouds in Northwest China.