利用全球气溶胶模式量化火灾驱动的粉尘排放

IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Robert Wagner, Kerstin Schepanski
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引用次数: 0

摘要

植被火灾越来越被认为是矿物粉尘的潜在夹带机制。然而,这种排放途径的全球重要性在很大程度上仍然未知。基于以往的LES调查,我们开发了一个参数化方法,将野火的粉尘排放潜力与火灾辐射功率的观测数据和进一步的土壤表面条件联系起来。将其应用到气溶胶-气候模式ICON-HAM中,并对2004-2013年10年期间有无新排放途径进行了模拟。火尘排放量约为230 (190-255)Tg yr - 1,约占全球粉尘排放总量的18%(15 - 21%)。这些额外的排放主要来自通常不被认为是矿物粉尘重要来源的地区。在局部地区,野火可以增加大气尘埃颗粒的存在,在南半球甚至可能超过其他形式的尘埃排放。高度粉尘活跃的火灾区域被确定在燃烧的草原创造合适的排放条件以及排放土壤类型的地区,尽管火灾相当微弱,例如在东欧或美国中部。火尘排放受强烈的季节性循环影响,主要受半球温暖和干燥季节之后的火灾活动驱动。与(粉尘)AOD观测的多年比较显示,由于额外的火尘排放,特别是在南半球最活跃的火灾地区,情况有所改善。然而,为了更好地分类源区及其随气候和土地利用条件变化的变化,还需要进一步研究和改进参数化方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Quantifying Fire-Driven Dust Emissions Using a Global Aerosol Model

Quantifying Fire-Driven Dust Emissions Using a Global Aerosol Model

Vegetation fires have become increasingly recognized as a potential entrainment mechanism for mineral dust. However, the global importance of this emission pathway remains largely unknown. Based on previous LES investigations, we developed a parameterization that relates the dust emission potential of wildfires to observational data of the fire radiative power and further soil-surface conditions. It was implemented into the aerosol-climate model ICON-HAM and simulations with and without the new emission pathway were conducted for the 10-year period 2004–2013. Fire-dust emissions can account for around 230 (190–255) Tg yr−1, which represents around 18 (15–21) % of the total global dust emissions. These additional emissions originate largely from regions that are typically not known as significant sources of mineral dust. Locally, wildfires can enhance the presence of atmospheric dust particles and on the Southern hemisphere might even surpass other forms of dust emission. Highly dust active fire regions are identified in areas where burning grasslands create suitable emission conditions together with emissive soil types despite rather weak fires, for example, in Eastern Europe or the Central US. Fire-dust emissions are subject to a strong seasonal cycle, mainly driven by the fire activity, following the hemispheric warm and dry seasons. Multi-year comparisons with (dust) AOD observations revealed improvements due to the additional fire-dust emissions, particularly in the most fire-active regions on the Southern hemisphere. Nevertheless, further research and improvements of the parameterization are required to better classify the source areas and their variation with the changing climate and land use conditions.

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来源期刊
Journal of Advances in Modeling Earth Systems
Journal of Advances in Modeling Earth Systems METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
11.40
自引率
11.80%
发文量
241
审稿时长
>12 weeks
期刊介绍: The Journal of Advances in Modeling Earth Systems (JAMES) is committed to advancing the science of Earth systems modeling by offering high-quality scientific research through online availability and open access licensing. JAMES invites authors and readers from the international Earth systems modeling community. Open access. Articles are available free of charge for everyone with Internet access to view and download. Formal peer review. Supplemental material, such as code samples, images, and visualizations, is published at no additional charge. No additional charge for color figures. Modest page charges to cover production costs. Articles published in high-quality full text PDF, HTML, and XML. Internal and external reference linking, DOI registration, and forward linking via CrossRef.
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