气候变化领域集成服务门户(CCPortal): The Dust Emission Potential of Agricultural-Like Fires—Theoretical Estimates From Two Conceptually Different Dust Emission Parameterizations

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DOI	10.1029/2020JD034355
	The Dust Emission Potential of Agricultural-Like Fires—Theoretical Estimates From Two Conceptually Different Dust Emission Parameterizations
	Wagner R.; Schepanski K.; Klose M.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:18
英文摘要	Agricultural fires affecting grass-, crop- and shrublands represent a major, mainly anthropogenically driven disturbance of many ecosystems. In addition to emissions of carbonaceous aerosol, they were found to inject also mineral dust particles into the atmosphere. The fires can significantly modulate the near-surface wind patterns so that conditions suitable for dust emission occur. However, the exact emission mechanism has not been investigated so far, but is inevitable for the understanding of its impacts on the Earth system. Here, we test two dust emission parameterizations representing saltation bombardment (SALT) and direct aerodynamic dust entrainment by (convective) turbulence (convective turbulent dust emission, CTDE) in the context of fire-modulated wind patterns using large-eddy simulation with an idealized setup to represent typical agricultural fire settings. Favorable aerodynamic preconditions for the initialization of both emission processes are found, however, with sometimes significant differences in dust emission flux depending on specific wind and fire properties. The strong fire-induced modulations of the instantaneous momentum flux suggest that CTDE can be a very potent emission process in the fire vicinity. Nevertheless, fire impacts on the friction velocity can be significant too, so that dust emission through SALT is facilitated as well. Ultimately, the specific aerodynamic conditions within pyro-convectively modulated wind patterns require the development of a parameterization that can describe these unique fire-related dust emissions and their influencing factors properly. This will finally allow for considering fire-induced dust emissions in aerosol-atmosphere models and an investigation of its atmospheric impacts such as on the radiation budget. © 2021. The Authors.
英文关键词	Agricultural fires; dust emission; dust modeling; mineral dust
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236988
作者单位	Leibniz Institute for Tropospheric Research (TROPOS), Leipzig, Germany; Freie Universität Berlin (FU Berlin), Institute of Meteorology, Berlin, Germany; Barcelona Supercomputing Center (BSC), Barcelona, Spain; Now at Department Troposphere Research (IMK-TRO), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
推荐引用方式 GB/T 7714	Wagner R.,Schepanski K.,Klose M.. The Dust Emission Potential of Agricultural-Like Fires—Theoretical Estimates From Two Conceptually Different Dust Emission Parameterizations[J],2021,126(18).
APA	Wagner R.,Schepanski K.,&Klose M..(2021).The Dust Emission Potential of Agricultural-Like Fires—Theoretical Estimates From Two Conceptually Different Dust Emission Parameterizations.Journal of Geophysical Research: Atmospheres,126(18).
MLA	Wagner R.,et al."The Dust Emission Potential of Agricultural-Like Fires—Theoretical Estimates From Two Conceptually Different Dust Emission Parameterizations".Journal of Geophysical Research: Atmospheres 126.18(2021).