Estimating Absorption Ångström Exponent of Black Carbon Aerosol by Coupling Multiwavelength Absorption with Chemical Composition,Environmental Science & Technology Letters

当前位置： X-MOL 学术 › Environ. Sci. Technol. Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Estimating Absorption Ångström Exponent of Black Carbon Aerosol by Coupling Multiwavelength Absorption with Chemical Composition
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2020-12-05 , DOI: 10.1021/acs.estlett.0c00829
Qiyuan Wang _{1,

2} , Huikun Liu ₁ , Jianhuai Ye ₃ , Jie Tian ₁ , Ting Zhang ₁ , Yong Zhang ₁ , Suixin Liu ₁ , Junji Cao _{1,

2}

Affiliation

Light absorption by black carbon (BC) and brown carbon (BrC) aerosols determines their impacts on climate warming, and the absorption Ångström exponent (AAE) attribution method often is used to distinguish the contributions of the two species to light absorption, but obtaining an accurate value for BC AAE (AAE_BC) has proven challenging. In this study, a receptor model was coupled with multiwavelength absorption information for light-absorbing aerosols used to retrieve a site-dependent AAE_BC that reflected the optical properties of the bulk BC aerosol. The results of a positive matrix factorization model showed that AAE_BC could be separated in contributions from two BC-related factors (pure-BC and BC-rich) during the campaign, and the retrieved average AAE_BC was 1.19, which is within the range of values obtained through source-related experiments and numerical calculations. The BrC light absorption estimated from AAE_BC = 1.19 was significantly different from the value (i.e., AAE_BC = 1.0) usually assumed in the literature. Our study provides insights that can improve the accuracy in quantifying the light absorption caused by carbonaceous aerosols, especially BrC.

中文翻译：

通过多波长吸收与化学成分的耦合估算黑碳气溶胶的吸收Ångström指数

黑碳（BC）和棕碳（BrC）气溶胶对光的吸收决定了它们对气候变暖的影响，吸收Ångström指数（AAE）归因法通常用于区分这两个物种对光吸收的贡献，但BC AAE（AAE _BC）的准确价值已被证明具有挑战性。在这项研究中，受体模型与用于吸收光的气溶胶的多波长吸收信息相结合，用于检索依赖于位点的AAE _BC，它反映了散装BC气溶胶的光学特性。正矩阵分解模型的结果表明，在运动期间，AAE _BC的贡献可以与两个与BC相关的因子（纯BC和富含BC）分开，并且可以获取平均AAE_BC为1.19，处于通过源相关实验和数值计算获得的值的范围内。根据AAE _BC = 1.19估算的BrC光吸收与文献中通常假定的值（即AAE _BC = 1.0）有显着差异。我们的研究提供了一些见识，可以提高量化碳质气溶胶（尤其是BrC）引起的光吸收的准确性。

更新日期：2021-02-09

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11