基于典型站位AERONET数据气溶胶类型分析

气溶胶是影响大气环境的重要因素，气溶胶光学厚度（AOD）是气溶胶的重要光学特征参数之一，气溶胶类型分析可以对区域大气研究提供科学依据.基于2015年12月—2019年11月AERONET数据选取的11个典型站位不同波段的AOD进行层次聚类分析，将所选站位最终划分为北京、沿海、太湖、西藏4个区域.然后基于图形分类法划分为6种气溶胶类型（清洁、沙漠粉尘、大陆、次大陆、城市工业和生物质燃烧型）.北京区域主要的气溶胶类型为城市工业型和大陆型，其中冬季主要为大陆型和清洁型、春季为大陆型和城市工业型、夏季和秋季主要为城市工业型气溶胶；沿海区域主要的气溶胶类型为大陆型气溶胶，其中冬、夏和秋季主要为大陆型和清洁型、春季主要为城市工业型和大陆型气溶胶；太湖区域城市工业型气溶胶占比最多，为41.96%，冬、春和夏季主要为城市工业型气溶胶，秋季主要为大陆型气溶胶；西藏区域清洁型气溶胶占比为80.53%，春夏秋冬四季以清洁型气溶胶为主.

Analysis on aerosol types of typical stations based on AERONET data

Aerosol is an important factor affecting the atmospheric environment. Aerosol optical depth (AOD) is one of the important optical characteristic of aerosols. Analysis on aerosol types can provide scientific basis for regional atmospheric research. AERONET data of 11 typical stations are selected from December 2015 to November 2019. Based on hierarchical clustering analysis on the AOD of different bands, the selected stations are finally divided into four regions:Beijing area, coastal area, Taihu Lake area, and Tibet area. Six aerosol types (clean type, desert dust type, continental type, subcontinental type, urban industrial type and biomass burning type) are classified in terms of graphic classification. The main aerosol types in Beijing area are urban industrial and continental type, while they are continental and clean type in winter, continental and urban industrial type in spring, and urban industrial type in summer and autumn. In coastal areas, they are mainly continental type, while continental and clean type in winter, summer and autumn, urban industrial and continental type in spring. It shows that the largest proportion of aerosol type is urban industrial in Taihu Lake region, accounting for 41.96%. It is also the main aerosol type in winter, spring and summer, while continental type in autumn. 80.53% of aerosols in Tibet belong to the clean type, which is also the main type in the whole year.