气候变化领域集成服务门户(CCPortal): The global impact of bacterial processes on carbon mass

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DOI	10.5194/acp-20-1777-2020
	The global impact of bacterial processes on carbon mass
	Ervens B.; Amato P.
发表日期	2020
ISSN	1680-7316
起始页码	1777
结束页码	1794
卷号	20 期号:3
英文摘要	Many recent studies have identified biological material as a major fraction of ambient aerosol loading. A small fraction of these bioaerosols consist of bacteria that have attracted a lot of attention due to their role in cloud formation and adverse health effects. Current atmospheric models consider bacteria as inert quantities and neglect cell growth and multiplication. We provide here a framework to estimate the production of secondary biological aerosol (SBA) mass in clouds by microbial cell growth and multiplication. The best estimate of SBA formation rates of 3.7 Tg yr-1 is comparable to previous model estimates of the primary emission of bacteria into the atmosphere, and thus this might represent a previously unrecognized source of biological aerosol material. We discuss in detail the large uncertainties associated with our estimates based on the rather sparse available data on bacteria abundance, growth conditions, and properties. Additionally, the loss of water-soluble organic carbon (WSOC) due to microbial processes in cloud droplets has been suggested to compete under some conditions with WSOC loss by chemical (OH) reactions. Our estimates suggest that microbial and chemical processes might lead to a global loss of WSOC of 8-11 and 8-20 Tg yr-1, respectively. While this estimate is very approximate, the analysis of the uncertainties and ranges of all parameters suggests that high concentrations of metabolically active bacteria in clouds might represent an efficient sink for organics. Our estimates also highlight the urgent need for more data concerning microbial concentrations, fluxes, and activity in the atmosphere to evaluate the role of bacterial processes as net aerosol sinks or sources on various spatial and temporal scales. © 2020 Author(s).
语种	英语
scopus关键词	abundance; aerosol; atmospheric modeling; bacterium; cloud; concentration (composition); growth; organic carbon; Bacteria (microorganisms)
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141547
作者单位	Université Clermont Auvergne, CNRS, Sigma-Clermont, Institut de Chimie de Clermont-Ferrand, Clermont-Ferrand, 63000, France
推荐引用方式 GB/T 7714	Ervens B.,Amato P.. The global impact of bacterial processes on carbon mass[J],2020,20(3).
APA	Ervens B.,&Amato P..(2020).The global impact of bacterial processes on carbon mass.Atmospheric Chemistry and Physics,20(3).
MLA	Ervens B.,et al."The global impact of bacterial processes on carbon mass".Atmospheric Chemistry and Physics 20.3(2020).