近源扩散和混凝参数化:生物质燃烧排放的应用

IF 3.8 Q2 ENVIRONMENTAL SCIENCES
Tanmay Sarkar , Taveen Singh Kapoor , Y.S. Mayya , Chandra Venkataraman , S. Anand
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引用次数: 0

摘要

生物质燃烧源附近的气溶胶粒径分布会发生快速变化,这主要是由于凝结作用,凝结作用会显著改变粒数粒径分布。现有的长程气溶胶传输和气候预测模型往往忽略了同时涉及凝结和扩散的近源动力学。为了弥补这一缺陷,本研究引入了混凝-弥散模型,并提供了有效粒度分布参数的半解析解。对于空间颗粒浓度变化的无扩散混凝羽流的精确解支持了分散-混凝模型半解析参数化的概念准确性。这些解法构成了参数化方案的基础,该方案考虑了源尺寸、颗粒质量通量、颗粒大小和大气条件等输入参数。利用这种参数化方法处理特定情况下的生物质燃烧排放,结果表明数量排放率降低了约 600 倍,而初始粒度分布的计数中值直径则增加了约 7 倍。此外,我们还估算了引入近源参数化方案前后气溶胶的光学特性。结果表明,气溶胶消光系数增加了 4 倍,散射系数增加了 20 倍,这将极大地影响全球模式中气溶胶光学特性的计算。这些光学特性的变化主要源于近源气溶胶动力学对气溶胶粒径分布的改变。本文将进一步讨论这些结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Near-source dispersion and coagulation parameterization: Application to biomass burning emissions

Near-source dispersion and coagulation parameterization: Application to biomass burning emissions

Aerosol size distributions near biomass-burning sources undergo rapid evolution, primarily due to coagulation, which significantly alters the particle number size distribution. Existing long-range aerosol transport and climate prediction models often overlook near-source dynamics involving simultaneous coagulation and dispersion. To bridge this gap, the present study introduces a coagulation-dispersion model and provides semi-analytical solutions for the effective size distribution parameters. The precise solution for a diffusion-less coagulating plume with spatially varying particle concentration supports the conceptual accuracy of the semi-analytical parameterization for dispersion-coagulation model. These solutions form the basis for a parameterization scheme that considers input parameters such as source dimensions, particle mass flux, particle size, and atmospheric conditions. Utilizing this parameterization for case-specific biomass burning emissions shows a decrease in number emission rate by approximately a factor of 600, while the count median diameter of the initial size distribution increases by around 7 times. Additionally, we estimate the optical properties of aerosols both before and after the introduction of the near-source parameterization scheme. Results indicate an increase by a factor of 4 in the aerosol extinction coefficient and by a factor of ∼20 in the scattering coefficient, which will significantly influence the calculation of aerosol optical properties in global models. These changes in optical properties primarily stem from modifications in aerosol size distribution resulting from near-source aerosol dynamics. The results are further discussed.

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来源期刊
Atmospheric Environment: X
Atmospheric Environment: X Environmental Science-Environmental Science (all)
CiteScore
8.00
自引率
0.00%
发文量
47
审稿时长
12 weeks
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