基于格点资料的四川大气混合层高度特征及与空气质量的关系

Characteristics Analysis of Atmospheric Mixed Layer Height Based on Lattice Data and the Relationship with Air Quality

基于2018年1月~2020年12月中国气象局陆面数据同化系统(CLDAS)资料,利用罗氏法计算四川省大气混合层高度,分析其时空分布特征,并结合大气环境空气质量监测数据,讨论大气混合层高度变化与空气质量的关系。结果表明:四川省大气混合层高度呈西高东低分布特征。盆地与攀西地区、川西高原大气混合层高度季节变化有显著性差异,盆地春季最高,秋季最低;川西高原和攀西地区秋季最高,夏季最低。四川省各地区大气混合层高度月、日变化趋势基本一致。四川省大气混合层高度与O_(3)质量浓度呈显著正相关关系,与PM_(25)质量浓度呈显著负相关关系。

Based on the Land Surface Data Assimilation System(CLDAS)data of China Meteorological Administration from January 2018 to December 2020,the height of atmospheric mixed layer in Sichuan province was calculated by Roche method,and its spatial and temporal distribution characteristics were analyzed.The relationship between the height change of atmospheric mixed layer and air quality was further analyzed by combining with the air quality monitoring data of atmospheric environment.The results show that:The height distribution of atmospheric mixed layer in Sichuan province is high in the west and low in the east.There is a significant difference between the Basin Area and Panxi Area and the Chuanxi Plateau in the seasonal variation of the atmospheric mixed layer height.In Sichuan Basin,the height is the highest in spring and the lowest in autumn,while in the Western Sichuan Plateau and Panxi area,the height is the highest in autumn and the lowest in summer.The monthly and daily variation trends of the atmospheric mixed layer height in all areas of Sichuan province are basically the same.The atmospheric mixed layer height in Sichuan province is significantly positively correlated with O3 mass concentration and negatively correlated with PM25 mass concentration.