Investigation of Aerosol Optical Depth(AOD) and ?ngstr?m Exponent over the Desert Region of Northwestern China Based on Measurements from the China Aerosol Remote Sensing Network(CARSNET)
作者单位：Plateau Atmospheric and Environment Key Laboratory of Sichuan Province College of Atmospheric Sciences Chengdu University of Information Technology Key Laboratory for Atmospheric Chemistry Institute of Atmospheric Composition Chinese Academy of Meteorological Sciences CMA Jiangsu Collaborative Innovation Center of Climate Change Laboratory for Middle Atmosphere and Global Environment Observation Institute of Atmospheric Physics Chinese Academy of Sciences Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science & Technology Institute of Atmospheric Environment China Meteorological Administration State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences
会议名称：《第32届中国气象学会年会》
会议日期：2015年
学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 08[工学] 070602[理学-大气物理学与大气环境] 0706[理学-大气科学] 0713[理学-生态学]
关 键 词：Aerosol optical depth(AOD) ?ngstr?m exponent(α) Aerosol classification Northwestern China.
摘 要：Aerosols at ten sites in northwestern China are classified in this study:(1)by using the aerosol optical depth(AOD),the?ngstr?m exponent(α)and the?ngstr?m exponent difference(δα);and(2)by using the total means of AOD440nm andα.The seasonal variations of the AOD andαshow that the maximum AODs occur in spring,except at Urumqi and *** seasonal meanαvalues are lower than 0.80 in all four seasons at Tazhong,Hotan,Hami,Ejina,Dunhuang,Minqin,and Jiuquan,but higher than 0.80 in winter at Urumqi,Lanzhou and *** first classification method shows that coarse mode particles are found at all ten sites,but that fine mode growth only happens at Urumqi,Lanzhou,and *** relationship between AOD440nm andαshow thatαsmaller than 0.80decrease with increasing AOD440nm at all ten *** are classified into four types(Type I–IV)according to the total meanτ440(440?)and total mean?ngstr?m exponent(?)of each *** with aτ440 smaller than 440?,but greater than or equal to?(τ440440?;α≥?)are classified as Type I;aerosols withτ440≥440?andα≥?are Type II;those withτ440440?andα