Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 10 2 2010 10.5194/acpd-10-2889-2010 http://www.atmos-chem-phys-discuss.net/10/2889/2010/ http://www.atmos-chem-phys-discuss.net/10/2889/2010/acpd-10-2889-2010.html http://www.atmos-chem-phys-discuss.net/10/2889/2010/acpd-10-2889-2010.pdf 2889 2914 2010-02-05 A case study of dust aerosol radiative properties over Lanzhou, China L. Zhang zhanglei@lzu.edu.cn X. Cao J. Bao B. Zhou J. Huang J. Shi J. Bi Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, 730000, China The vertical distribution of dust aerosol and its radiative properties are analysed using the data measured by the micropulse lidar, profiling microwave radiometer, sunphotometer, particulate monitor, and nephelometer at the Semi-Arid Climate and Environment Observatory of Lanzhou University (SACOL) during a dust storm from 27 March to 29 March 2007. The analysis shows that the dust aerosol mainly exists below 2 km in height, and the dust aerosol extinction coefficient decreases with height. The temporal evolution of aerosol optical depth (AOD) during the dust storm is characterized by a sub-maximum at 22:00 (Beijing Time) on 27 March and a maximum at 12:00 on 28 March. The AOD derived by lidar is compared with that obtained by sunphotometer, and shows a good consistency. 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