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Particulates

机译:颗粒物

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摘要

The microphysical structure, chemical composition and prehistory of aerosol are related to the aerosol optical properties and radiative effect in the UV spectral range. The aim of this work is the statistical mapping of typical aerosol scenarios and adjustment of regional aerosol parameters. The investigation is based on the in situ measurements in Preila (55.55° N, 21.00° E), Lithuania, and the AERONET data from the Gustav Dalen Tower (58 N, 17 E), Sweden. Clustering of multiple characteristics enabled to distinguish three aerosol types for clear-sky periods: 1) clean maritime-continental aerosol; 2) moderately polluted maritime-continental aerosol; 3) polluted continental aerosol. Differences between these types are due to significant differences in aerosol number and volume concentration, effective radius of volume distribution, content of SO_4~- ions and Black Carbon, as well as different vertical profiles of atmospheric relative humidity. The UV extinction, aerosol optical depth (AOD) and the Ungstrom coefficient α increased with the increasing pollution. The value α = 1.96 was observed in the polluted continental aerosol that has passed over central and eastern Europe and southern Russia. Reduction of the clear-sky UV index against the aerosol-free atmosphere was of 4.5%, 27% and 41% for the aerosol types 1, 2 and 3, respectively.
机译:气溶胶的微观物理结构,化学组成和史前史与紫外光谱范围内的气溶胶光学特性和辐射效应有关。这项工作的目的是对典型气溶胶情景进行统计绘图并调整区域气溶胶参数。这项调查基于立陶宛Preila(55.55°N,21.00 E)的原位测量以及瑞典Gustav Dalen塔(58 N,17 E)的AERONET数据。通过多种特征的聚类,可以区分晴空时期的三种气溶胶类型:1)清洁的海陆气溶胶; 2)中度污染的海陆气溶胶; 3)污染了大陆气溶胶。这些类型之间的差异是由于气溶胶数量和体积浓度,有效体积分布半径,SO_4-离子和黑碳的含量以及大气相对湿度的垂直分布不同而造成的。随着污染的增加,紫外线的消光,气溶胶光学深度(AOD)和Ungstrom系数α增大。在经过中欧,东欧和俄罗斯南部的受污染的大陆气溶胶中观测到的值α= 1.96。相对于无气溶胶的大气,晴空紫外线指数分别下降了4.5%,27%和41%(分别针对1型,2型和3型气溶胶)。

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    《Oceanographic Literature Review》 |2009年第3期|519-521|共3页
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