Backscattering Linear Depolarization Ratio of Smoke Aerosols From Biomass Burning

IF 3.8 2区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES Journal of Geophysical Research: Atmospheres Pub Date : 2024-10-03 DOI:10.1029/2024JD041276
Zhenhai Qin, Haihui Wang, Aonan He, Yuping Sun, Jingan Li, Yongming Zhang, Qixing Zhang
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Abstract

The linear depolarization ratio (LDR) of backscattering is a key parameter for distinguishing particle types. The measured LDRs of smoke in previous studies are highly variable and different from each other. Existing research on smoke aerosols considers only the internal mixing state of the black carbon (BC) particle population either by ignoring the externally mixed organic carbon (OC) particle population or by evaluating the LDR of smoke aerosols using the results of individual particles rather than the particle population. The field-measured LDR of smoke then becomes difficult to interpret properly. The recent prescribed forest burning experiment in China showed that the LDR of freshly emitted smoke varies between 0.0% and 20.1% in wavelength (λ) of 532 nm. Electron microscopy images also showed that coated BC and pure OC exist simultaneously in biomass burning aerosols. Therefore, this study evaluates the influence of various parameters on the LDR of smoke by considering the internal and external mixing states. The calculated LDRs of the smoke aerosols were found to vary between 0.0% and 28.2% when λ is equal to 532 nm. The calculation results indicate that the LDR of smoke is slightly influenced by BC, considerably affected by the externally mixed OC, and is essentially dominated by the latter's morphology and particle size distribution. High levels and rapid changes of LDR of smoke can be well explained by nonsphericity and particle size distribution of externally mixed OC. This study advances the research on the measurement and evaluation of the LDR of smoke aerosols.

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生物质燃烧产生的烟雾气溶胶的反向散射线性去极化率
反向散射的线性去极化比(LDR)是区分颗粒类型的关键参数。以往研究中测得的烟雾线性去极化率变化很大,而且相互之间存在差异。现有的烟雾气溶胶研究只考虑了黑碳(BC)颗粒群的内部混合状态,忽略了外部混合的有机碳(OC)颗粒群,或者使用单个颗粒而非颗粒群的结果来评估烟雾气溶胶的 LDR。这样就很难正确解释实地测量的烟雾 LDR。最近在中国进行的规定森林燃烧实验表明,在波长(λ)为 532 纳米的情况下,新鲜排放烟雾的 LDR 在 0.0% 到 20.1% 之间变化。电子显微镜图像还显示,生物质燃烧气溶胶中同时存在涂覆 BC 和纯 OC。因此,本研究通过考虑内部和外部混合状态,评估了各种参数对烟雾 LDR 的影响。当 λ 等于 532 nm 时,计算得出的烟雾气溶胶 LDR 在 0.0% 到 28.2% 之间变化。计算结果表明,烟雾的 LDR 受 BC 的影响较小,受外部混合 OC 的影响较大,而主要受后者的形态和粒度分布的影响。外部混合 OC 的非球形性和粒度分布可以很好地解释烟雾 LDR 的高水平和快速变化。这项研究推动了烟雾气溶胶 LDR 的测量和评估研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Geophysical Research: Atmospheres
Journal of Geophysical Research: Atmospheres Earth and Planetary Sciences-Geophysics
CiteScore
7.30
自引率
11.40%
发文量
684
期刊介绍: JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.
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