Abstract
Tajikistan is often affected by atmospheric mineral dust originating from various surrounding deserts. The direct and indirect radiative effects of that dust play a sensitive role in the Central Asian climate system and therefore need to be quantified. The Central Asian Dust Experiment (CADEX) provides for the first time an aerosol climatology for Central Asia based long-term aerosol profiling by ground-based lidar (PollyXT type) in Dushanbe, Tajikistan. For pure dust cases, mean depolarization(lidar) ratios of 0.23±0.03(44±3 sr) at 355 nm and 0.32±0.02(38±3 sr) at 532 nm wavelength have been measured. The mean extinction-related Ångström exponent was 0.18±0.15.
Highlights
The Central Asian country Tajikistan and its neighboring countries contain vast arid regions and are located within the global dust belt reaching from the Sahara to the Gobi desert
Longterm data on vertical profiles of aerosol optical properties are provided by the Central Asian Dust Experiment (CADEX)
The layer-mean particle linear depolarization ratio of the 21 pure dust cases ranged from 0.18±0.01 to 0.29±0.01 at 355 nm and from 0.30±0.02 to 0.36±0.01 at 532 nm wavelength
Summary
Tajikistan is often affected by atmospheric mineral dust originating from various surrounding deserts. The direct and indirect radiative effects of that dust play a sensitive role in the Central Asian climate system and need to be quantified. The Central Asian Dust Experiment (CADEX) provides for the first time an aerosol climatology for Central Asia based long-term aerosol profiling by ground-based lidar (PollyXT type) in Dushanbe, Tajikistan. Mean depolarization(lidar) ratios of 0.23±0.03(44±3 sr) at 355 nm and 0.32±0.02(38±3 sr) at 532 nm wavelength have been measured. The mean extinctionrelated Ångström exponent was 0.18±0.15
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