摘要
【目的】分析重庆市2014年6月到2015年5月期间气溶胶光学厚度(Aerosol optical thickness,AOT)的空间分布特征。【方法】基于国产极轨气象卫星FY3C/MERSI的气溶胶光学厚度产品得到AOT并用FY3C/MERSI气溶胶光学厚度产品和太阳光度计的实测数据进行对比分析。【结果】对比分析的相关系数为0.64,绝对误差为0.145,均方根误差为0.196。由年平均AOT的空间分布可知,重庆地区AOT分布呈现出东低西高的趋势,其中大巴山七曜山高海拔地区AOT较低,基本上在0～0.3之间,中部地区AOT在0.3～0.5之间,主城、西部地区绝大部分地区AOT在0.5以上,局部在0.6以上。从AOT的时间分布看,1月为高值期,12月、2月次之,5月最低;按季平均AOT来看,重庆市AOT高值期在冬季,秋季、春季AOT次之,夏季AOT最低。【结论】FY3C/MERSI的气溶胶光学厚度产品能较好的反映AOT的空间分布,与实际分布对比相关性高。
[Purposes]Analysis of Spatial Distribution Characteristics of Aerosol Optical Thickness（AOT）in Chongqing from June 2014 to May 2015.[Methods]AOT is obtained based on the aerosol optical depth product of a domestic polar orbiting meteorological satellite FY3C/MERSI.And the comparative analysis of the FY3C/MERSI aerosol optical thickness products and the measured data of the sun-photometer was carried out.[Findings]The correlation coefficient between the MERSI AOT product and the sunphotometer was 0.64,the absolute error was 0.145,and the root mean square error was 0.196.From the perspective of spatial distribution of annual average AOT,AOT showing a trend of low east-west high.Among them,the Daba Mountains and Qiyao Mountain,between 0 and 0.3,are relatively low in the high-altitude areas.The central region between 0.3～0.5.The main city,the vast majority of the western region in more than 0.5,some areas above 0.6.According to the time distribution of AOT,January is the high value period,followed by December and February,and the lowest in May.According to the season,the winter season is the AOT high season,followed by the autumn and spring,the lowest in summer.[Conclusions]The aerosol optical thickness of FY3 C/MERSI products can well reflect the spatial distribution of AOT,which is highly correlated with the actual distribution.
作者
杨杰
王永前
杨世琦
翟云
YANG Jie;WANG Yongqian;YANG Shiqi;ZHAI Yun(Chengdu University of Information Technology,Chengdu 610225;Chongqing Institute of Meteorological Sciences,Chongqing 401147,China)
出处
《重庆师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第6期49-55,F0002,共8页
Journal of Chongqing Normal University:Natural Science
基金
国家自然科学基金(No.41471305)
重庆市气象局开放基金(No.kfjj-201402)
四川省教育厅创新团队项目(No.16TD0024)
FY3应用示范项目(No.FY-3(02)-UDS-1.11.2)
重庆市气象局团队建设项目(ZHCXTD-201826)
