黄渤海上空气溶胶类型判别及其成因分析

Classification of aerosols types over the Yellow and Bohai Sea

气溶胶是大气环境的重要组成部分,其对天气和气候变化有重要影响,对人类健康也有危害.对气溶胶类型的区分有利于判别气溶胶的来源,这对控制气溶胶污染源、改善区域环境质量有重要的推动作用.本文基于黄渤海区域6个观测点的实测数据和卫星遥感数据,采用聚类分析方法对黄渤海上空的气溶胶进行分类,并采用拉格朗日轨迹追踪法判定气溶胶的来源.研究发现,黄渤海上空的气溶胶类型以清洁大陆型和生物燃烧以及城市/工业型为主,陆源输入是黄渤海上空气溶胶的重要来源.清洁大陆型的气溶胶在黄海中部的贡献率相比于其余海域偏低,这也间接表明近岸的气溶胶更易受到来自陆地的影响,离岸区域受陆地的影响相对较小.

Aerosols are important components of the atmospheric environment and play a vital role in reducing air quality, degradation of atmospheric visibility, climate change, and also harmful to human health. In order to distinguish their sources, the classification and discrimination of aerosol types are important. The identification of aerosol sources can play an important role in controlling local air pollution and help policymakers. In this study, we used both ground-based and satellite-based remote sensing data to classify aerosol types and distinguish the sources of aerosols over the Yellow and Bohai Sea. It was found that the dominant types of aerosols over the Yellow and Bohai Sea were clean continental and biomass burning/urban industrial aerosols. Terrigenous input was an important source of aerosol over the Yellow and Bohai Sea. Contribution of clean continental aerosols in the central part of the Yellow Sea is lower than that of other areas, which indicates that the nearshore aerosols are mainly influenced by land sources compared to the offshore areas.