Aerosol vertical distribution and seasonal variation over SACOL derived from CALIPSO lidar observations

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• 作者：Pengfei TianLei ZhangXianjie Cao
• 会议时间：2013-05-16
• 关键词：atmospheric aerosol ; CALIPSO ; vertical distribution ; seasonal variation
• 作者单位：Pengfei Tian,Xianjie Cao(Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, 730000, China)Lei Zhang(Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of AtmosphericSciences, Lanzhou University, Lanzhou, 730000, China)
• 母体文献：第十一届全国气溶胶会议暨第十届海峡两岸气溶胶技术研讨会论文集
• 会议名称：第十一届全国气溶胶会议暨第十届海峡两岸气溶胶技术研讨会
• 会议地点：武汉
• 主办单位：中国颗粒学会
• 语种：chi

摘要

Firstly,presents an assessment of CALIPSO observation by comparing to the ground based lidar CE 370-2.Then CALIPSO level 2 aerosol profile data from June 2006 to October 2011 is used to study the vertical distribution and seasonal variation of aerosols over SACOL.Four types of aerosols are observed over SACOL: dust (with an occurrence frequency of 55.3% among all subtypes of aerosols),polluted dust (27.3%),smoke (15.5%) and clean continental (1.8%).Aerosols are uniformly distributed from ground to 2 km above,anthropogenic aerosols decrease while natural aerosols relatively increase from 2 to 4 km,dust dominates in the heights of 4~6 km,while only polluted dust is observed in the layer of 6~8 km,no aerosol is observed above 8 km.In spring,dust occurs frequently over SACOL (90.6%); in summer,the occurrence frequency of smoke almost equals that of polluted dust and these two types of aerosols occur almost at the same height bin; in autumn,local dust and smoke are mixed from ground to 2 km; in winter,dust is observed in the height bin of 2~6 km.Dust is mostly observed in spring and winter within 6 km; smoke is mostly observed in summer and autumn within 4 km; polluted dust has much the same occurrence frequency in summer,autumn and winter,mostly below 2 km and can reach the height bin of 6~8 km.