基于太阳光度计的天津沿海地区气溶胶特性  

Aerosol Characteristics of Tianjin Coastal Areas Based on Solar Photometer

作　　者：刘雨华 郑小慎 LIU Yuhua;ZHENG Xiaoshen(College of Marine and Environmental Sciences,Tianjin University of Science&Technology,Tianjin 300457,China)

机构地区：[1]天津科技大学海洋与环境学院,天津300457

出　　处：《天津科技大学学报》2020年第4期41-46,共6页Journal of Tianjin University of Science & Technology

基　　金：天津市自然科学基金资助项目(19JCYBJC23600,14JCYBJC22500)。

摘　　要：利用MicrotopsⅡ型手持太阳光度计实测的气溶胶光学厚度(AOD)对天津沿海地区气溶胶光学特性进行研究,并结合波长指数α、浑浊度系数β对气溶胶特性进行进一步分析.结果表明:在研究时段2018年3月到11月中,AOD500月变化的最高值出现在7月,为0.94±0.38,最低值出现在5月,为0.41±0.20;在季节变化中夏季最高,秋季最低.α月变化的最高值出现在7月,为1.42±0.02,最低值出现在5月,为0.76±0.42;在季节分布中夏季最高,春季最低,根据波长指数分布特点,细粒子占天津沿海地区气溶胶类型的主导地位.β在研究时段内平均为0.39±0.33,空气以较为浑浊为主,月分布中最低月和最高月分别出现在5月和11月,季节分布中夏季最高.在气溶胶的模态占比分析中,细模态占据主要贡献比率.AOD高值可能与北方沙尘、海盐气溶胶、细模态气溶胶吸湿增长有关.The aerosol optical depth(AOD)measured with MicrotopsⅡhandheld solar photometer was used to study the aerosol optical characteristics in Tianjin coastal areas,which were analyzed with the wavelength indexαand the turbidity coefficientβ.The results showed that,during the study period from March to November 2018,the highest monthly change value of AOD occurred in July(0.94±0.38),and the lowest value occurred in May(0.41±0.20).AOD was highest in summer and lowest in autumn.The highest value of the monthly variation ofαappeared in July(1.42±0.02),and the lowest value appeared in May(0.76±0.42).In the seasonal distribution,αwas the highest in summer and the lowest in spring.According to the distribution characteristics of the wavelength index,fine particles occupied the dominant position of aerosol types in the coastal areas of Tianjin.During the study period,the average value ofβwas 0.39±0.33,and the air was dirty most of the time.The lowest and highest monthly distribution occurred in May and November,respectively,and the highest seasonal distribution occurred in summer.Analysis of the aerosol mode proportion showed that the contribution ratio of fine mode was the highest.The high value of AOD may be related to the increase of sand dust,sea salt aerosol and fine mode aerosol in northern China.

关 键 词：气溶胶光学厚度 波长指数 浑浊度系数 天津沿海地区 

分 类 号：X513[环境科学与工程—环境工程]