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JOURNAL OF DESERT RESEARCH ›› 2018, Vol. 38 ›› Issue (2): 372-383.DOI: 10.7522/j.issn.1000-694X.2016.00170

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Characteristics of Dust Aerosol in both Clear-sky and Above-cloud Conditions over East Asia

Ru Jianbo1,2, Wang Tianhe1, Li Jiming1, Han Ying1, Zhang Beidou1   

  1. 1. Ministry of Education Key Laboratory for Semi-Arid Climate Change, Lanzhou University, Lanzhou 730000, China;
    2. Lanzhou Meteorological Bureau, Lanzhou 730020, China
  • Received:2016-12-08 Revised:2017-01-25 Online:2018-03-20 Published:2018-03-20

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

CLC Number: