东亚沙尘源区晴空和云上沙尘气溶胶特征

doi:10.7522/j.issn.1000-694X.2016.00170

摘要/Abstract

摘要： 利用2006年6月至2012年12月的CALIPSO Level 2 VFM产品、5 km分辨率的Aerosol Profile、Cloud Layer产品以及MISR反演的产品，揭示了东亚地区不同高度层上沙尘的时空分布特征，重点对比分析了东亚沙尘源区晴空和云上沙尘的垂直分布特征、消光系数和光学厚度。结果表明：塔克拉玛干沙漠和戈壁沙漠是东亚沙尘的主要源区，沙尘出现频率具有显著的季节差异，春季最多，夏秋相当，冬季最少，无论在晴空还是有云条件下，前者出现频率大于后者。对于同一地区而言，云上沙尘出现的最大高度较晴空沙尘更高。塔克拉玛干沙漠云上沙尘消光系数高值区集中在2~4 km，而戈壁沙漠则集中在3~5 km，但是在云层之上晴空和云上沙尘消光系数差别不大。塔克拉玛干沙漠以沙尘气溶胶为主，约占总气溶胶光学厚度的77%，晴空和云上沙尘光学厚度平均值分别为0.22和0.15；戈壁沙尘气溶胶约占总气溶胶光学厚度的52%，晴空和云上沙尘光学厚度的平均值分别为0.09和0.06。

关键词: 东亚地区, 沙尘气溶胶, 出现频率, 消光系数, 光学厚度

Abstract: Based on CALIPSO Level 2 VFM, 5 km Aerosol Profile, 5 km Cloud Layer and MISR products from June 2006 to December 2012, we reveal the spatial and temporal distribution of dust aerosol in different height layers over East Asia. Especially, the vertical distribution, extinction coefficient and optical depth of dust aerosol are contrasted and analyzed in both clear-sky (CS) and above-cloud (AC) conditions over East Asia. The results show that the Taklimakan Desert (TD) and the Gobi Desert (GD) are the main dust source regions over East Asia. The distribution of dust occurrence frequency has significant seasonal difference, with the highest in spring, and the lowest in winter. Dust occurrence frequency over the TD is greater than that over the GD whenever in CS or AC conditions. For the same area, the maximum height of dust aerosol above cloud is higher than that of clear sky, and the high-value areas of dust extinction coefficient above cloud over the TD is at the height of 2-4 km, while that about 3-5 km over the GD. But the dust extinction coefficient above cloud has no significant difference between two conditions. The aerosol over the TD is dominated by dust aerosol, which accounts for 77% of the total aerosol optical depth (AOD). The average dust optical depths (DOD) are 0.22 and 0.15 in CS and AC conditions respectively. The dust aerosol over the GD accounts for 52% of the total AOD, and the average DOD is 0.09 and 0.06 in CS and AC conditions respectively. The results are the basis of further study on dust mass fluxes estimation in CS and AC conditions and even dust-cloud-climate interactions.

Key words: East Asia, dust aerosol, occurrence frequency, extinction coefficient, optical depth

中图分类号:

P407.2

茹建波, 王天河, 李积明, 韩颖, 张北斗. 东亚沙尘源区晴空和云上沙尘气溶胶特征[J]. 中国沙漠, 2018, 38(2): 372-383.

Ru Jianbo, Wang Tianhe, Li Jiming, Han Ying, Zhang Beidou. Characteristics of Dust Aerosol in both Clear-sky and Above-cloud Conditions over East Asia[J]. JOURNAL OF DESERT RESEARCH, 2018, 38(2): 372-383.

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