基于CE-318观测的甘肃省气溶胶光学特性分析  

Optical Characterization of Aerosols in Gansu Province Based on CE-318 Observations

作　　者：黄芳芳 马伟强[2,3,4,5] 王遂缠 张鸿 孔小怡 卢品睿 王旭东 刘昊 闫一丹 HUANG Fangfang;MA Weiqiang;WANG Suichan;ZHANG Hong;KONG Xiaoyi;LU Pinrui;WANG Xudong;LIU Hao;YAN Yidan(Gansu Meteorological Information and Technology Support Center,Gansu Meteorological Bureau,Lanzhou 730020,Gansu,China;Land-Atmosphere Interaction and its Climatic Effects Group,State Key Laboratory of Tibetan Plateau Earth System,Environment and Resources(TPESER),Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China;College of Atmospheric Science,Lanzhou University,Lanzhou 730000,Gansu,China;National Observation and Research Station for Qomolongma Special Atmospheric Processes and Environmental Changes,Dingri 858200,Xizang,China;China-Pakistan Joint Research Center on Earth Sciences,Chinese Academy of Sciences,Islamabad 45320,Pakistan;Lanzhou Meteorological Administration,Lanzhou 730030,Gansu,China)

机构地区：[1]甘肃省气象信息与技术装备保障中心,甘肃兰州730020 [2]中国科学院青藏高原研究所青藏高原地球系统科学国家重点实验室地气作用与气候效应团队,北京100101 [3]兰州大学大气科学学院,甘肃兰州730000 [4]西藏珠穆朗玛特殊大气过程与环境变化国家野外科学观测研究站,西藏定日858200 [5]中国科学院中国-巴基斯坦地球科学研究中心,伊斯兰堡453206 [6]兰州市气象局,甘肃兰州730030

出　　处：《高原气象》2024年第1期241-253,共13页Plateau Meteorology

基　　金：甘肃省科技计划(创新基地和人才计划)项目(21JR7RA714);国家自然科学基金项目(U2242208);西藏科技厅项目(XZ202301YD0025C)。

摘　　要：对于大气气溶胶地基观测资料的定量分析是了解气溶胶光学特性和大气污染特征的基本途径,可为探讨污染治理方向提供一定的依据。近年来,利用地基观测资料分析甘肃省不同区域气溶胶光学特性的研究较少。为了解甘肃省不同下垫面的大气气溶胶光学特性,本文基于2018年4月至2020年9月CE-318型太阳光度计观测资料,通过ASTPwin软件反演获得了甘肃省四个站点的气溶胶光学厚度AOD,计算了Angstrom波长指数α,分析了甘肃省不同区域不同季节AOD和α的分布和变化特征以及气溶胶光学厚度和波长指数的关系。结果表明:(1)观测时段内,所有站点各波段AOD的变化趋于一致,且AOD值随波长增大而减小。兰州和皋兰山AOD值冬季最高,春、秋季次之,夏季最低,兰州冬、春季AOD值分别比年均值超出14.98%和4.68%,皋兰山冬季AOD值比年均值超出3.88%。敦煌和民勤AOD值均为春季最高,比各自的年均值高出24.49%和26.30%。敦煌AOD季节分布为:春季>夏季>冬季>秋季,而民勤则表现为从春到冬季逐渐减小的趋势。(2)兰州和皋兰山春夏季主控粒子为粗模态,秋冬季则为细颗粒物主导。敦煌和民勤大气气溶胶常年由粗模态粒子主控。2019年冬季,兰州市区AOD值比其城郊的皋兰山高出68.0%;敦煌和民勤2019年春季沙尘气溶胶污染较为严重,敦煌AOD值比民勤超出42.42%。(3)四个站点AOD和α的频率分布均呈单峰曲线,不同季节AOD高频次分布范围存在差异性,但都处于1.0以下。α的高频次范围分布较为复杂,兰州春季、皋兰山春夏季、敦煌四季、民勤春夏秋季,α分布区间均小于1.0,而兰州夏秋冬季、皋兰山秋冬季、民勤冬季α主要分布于1.1以上。(4)不同季节AOD和α的关系存在差异,表现为不同季节,大气出现严重或者局部污染时,气溶胶的主控粒子粒径大小不同。春季大气出现局部或者严重污染、夏季大气局部污染时,�The quantitative analysis of ground-based observations of atmospheric aerosols is a basic way to understand the optical properties of aerosols and the characteristics of atmospheric pollution,which can provide a certain basis for exploring the direction of pollution control.In recent years,there are few studies on the analysis of aerosol optical properties in different regions of Gansu Province using ground-based observations.In order to understand the atmospheric aerosol optical characteristics of different land surfaces in Gansu Province,we obtained the aerosol optical depth(AOD)of four stations in Gansu Province through ASTPwin software based on CE-318 solar photometer observations from April 2018 to September 2020 and calculated the Angstrom wavelength indexα.The distribution and variation characteristics of AOD andαin different regions of Gansu Province in different seasons and the relationship between aerosol optical depth and wavelength index were analyzed.The results show that:(1)the changes of AOD in each wavelength band tend to be consistent in all stations during the observation period,and the AOD value decreases with increasing wavelength.The AOD values of Lanzhou and Gaolan Mountain were the highest in winter,followed by spring and autumn,and the lowest in summer.The winter and spring AOD values of Lanzhou exceeded the annual average by 14.98%and 4.68%,respectively,and the winter AOD value of Gaolan Mountain exceeded the annual average by 3.88%.Dunhuang and Minqin both had the highest AOD values in spring,which were 24.49%and 26.30%higher than their respective annual averages.The seasonal distribution of AOD in Dunhuang was:spring>summer>winter>autumn,while Minqin showed a trend of gradually smaller values from spring to winter.(2)The dominant particles in Lanzhou and Gaolan Mountain are coarse modal in spring and summer,while fine particles dominate in autumn and winter.Dunhuang and Minqin atmospheric aerosols are dominated by coarse modal particles all year round.In the winter of 2019,the AOD val

关 键 词：CE-318太阳光度计 气溶胶光学厚度(AOD) 地基观测 甘肃省 

分 类 号：P404[天文地球—大气科学及气象学]