Advanced modeling of the absorption enhancement of black carbon particles in chamber experiments by considering the morphology and coating thickness

IF 6.1 2区 环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL
Xiaodong Wei, Jianlin Hu, Chao Liu, Xiaodong Xie, Junjie Yin, Song Guo, Min Hu, Jianfei Peng, Huijun Wang
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Abstract

Measurements studies have shown that the absorption of radiation by black carbon (BC) increases as the particles age. However, there are significant discrepancies between the measured and modeled absorption enhancement (Eabs), largely due to the simplifications used in modeling the mixing states and shape diversities. We took advantage of chamber experiments on BC aging and developed an efficient method to resolve the particle shape based on the relationship between the coating fraction (ΔDve/Dve,0) and fractal dimension (Df), which can also reflect the variations of Df during the whole BC aging process. BC with externally and partly mixed states (0 ⩽ ΔDve/Dve,0 ⩽ 0.5) can be considered to be uniformly distributed with the Df values of 1.8–2.1, whereas the Df values are constrained in the range 2.2–2.8 for fully mixed states (ΔDve/Dve,0 > 0.5). The morphological parameters (i.e., the effective density and the dynamic shape factor) were compared with the measured values to verify the simulated morphology. The simulated mean deviations of morphological parameters were smaller than 8% for the method resolving the particle shape. By applying a realistic shape and refractive index, the mass absorption cross for fully mixed states can be improved by 11% compared with a simplified core–shell model. Based on our understanding of the influence of Df and ΔDve/Dve,0 on Eabs, we propose a two-stage calibration equation to correct the Eabs values estimated by the core–shell model, which reduces the simulation error in the Mie calculation by 6%–14%.

Abstract Image

通过考虑形态和涂层厚度,建立黑碳颗粒在箱体实验中吸收增强的高级模型
测量研究表明,黑碳(BC)对辐射的吸收随着颗粒老化而增加。然而,测量值和建模的吸收增强值(Eabs)之间存在很大差异,这主要是由于在模拟混合状态和形状多样性时使用了简化方法。我们利用 BC 老化室实验,开发了一种基于包覆分数(ΔDve/Dve,0)和分形维数(Df)之间关系的有效方法来解析颗粒形状,该方法还能反映整个 BC 老化过程中 Df 的变化。外部混合和部分混合状态(0 ⩽ ΔDve/Dve,0⩽0.5)的 BC 可视为均匀分布,Df 值为 1.8-2.1,而完全混合状态(ΔDve/Dve,0 &ggt;0.5)的 BC 的 Df 值限制在 2.2-2.8 范围内。形态参数(即有效密度和动态形状因子)与测量值进行了比较,以验证模拟形态。在解析颗粒形状的方法中,形态参数的模拟平均偏差小于 8%。与简化的核壳模型相比,通过应用真实的形状和折射率,完全混合状态的质量吸收交叉可提高 11%。基于我们对 Df 和 ΔDve/Dve,0 对 Eabs 影响的理解,我们提出了一个两阶段校正方程来修正核壳模型估算的 Eabs 值,从而将米氏计算的模拟误差降低了 6%-14% 。
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来源期刊
Frontiers of Environmental Science & Engineering
Frontiers of Environmental Science & Engineering ENGINEERING, ENVIRONMENTAL-ENVIRONMENTAL SCIENCES
CiteScore
10.90
自引率
12.50%
发文量
988
审稿时长
6.1 months
期刊介绍: Frontiers of Environmental Science & Engineering (FESE) is an international journal for researchers interested in a wide range of environmental disciplines. The journal''s aim is to advance and disseminate knowledge in all main branches of environmental science & engineering. The journal emphasizes papers in developing fields, as well as papers showing the interaction between environmental disciplines and other disciplines. FESE is a bi-monthly journal. Its peer-reviewed contents consist of a broad blend of reviews, research papers, policy analyses, short communications, and opinions. Nonscheduled “special issue” and "hot topic", including a review article followed by a couple of related research articles, are organized to publish novel contributions and breaking results on all aspects of environmental field.
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