气候变化领域集成服务门户(CCPortal): Radiative and chemical implications of the size and composition of aerosol particles in the existing or modified global stratosphere

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DOI	10.5194/acp-21-8915-2021
	Radiative and chemical implications of the size and composition of aerosol particles in the existing or modified global stratosphere
	Murphy D.M.; Froyd K.D.; Bourgeois I.; Brock C.A.; Kupc A.; Peischl J.; Schill G.P.; Thompson C.R.; Williamson C.J.; Yu P.
发表日期	2021
ISSN	1680-7316
起始页码	8915
结束页码	8932
卷号	21 期号:11
英文摘要	The size of aerosol particles has fundamental effects on their chemistry and radiative effects. We explore those effects using aerosol size and composition data in the lowermost stratosphere along with calculations of light scattering. In the size range between about 0.1 and 1.0ĝ€μm diameter (accumulation mode), there are at least two modes of particles in the lowermost stratosphere. The larger mode consists mostly of particles produced in the stratosphere, and the smaller mode consists mostly of particles transported from the troposphere. The stratospheric mode is similar in the Northern and Southern Hemisphere, whereas the tropospheric mode is much more abundant in the Northern Hemisphere. The purity of sulfuric acid particles in the stratospheric mode shows that there is limited production of secondary organic aerosol in the stratosphere, especially in the Southern Hemisphere. Out of eight sets of flights sampling the lowermost stratosphere (four seasons and two hemispheres) there were three with large injections of specific materials: volcanic, biomass burning, or dust. The stratospheric and tropospheric modes have very different roles for radiative effects on climate and for heterogeneous chemistry. Because the larger particles are more efficient at scattering light, most of the radiative effect in the lowermost stratosphere is due to stratospheric particles. In contrast, the tropospheric particles can have more surface area, at least in the Northern Hemisphere. The surface area of tropospheric particles could have significant implications for heterogeneous chemistry because these particles, which are partially neutralized and contain organics, do not correspond to the substances used for laboratory studies of stratospheric heterogeneous chemistry. We then extend the analysis of size-dependent properties to particles injected into the stratosphere, either intentionally or from volcanoes. There is no single size that will simultaneously maximize the climate impact relative to the injected mass, infrared heating, potential for heterogeneous chemistry, and undesired changes in direct sunlight. In addition, light absorption in the far ultraviolet is identified as an issue requiring more study for both the existing and potentially modified stratosphere. © Copyright:
语种	英语
scopus关键词	aerosol; aerosol composition; biomass burning; light scattering; Northern Hemisphere; particulate matter; size distribution; Southern Hemisphere; stratosphere; sulfuric acid
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/246815
作者单位	Noaa Chemical Sciences Laboratory, Boulder, CO 80305, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, United States; Faculty of Physics, Aerosol Physics and Environmental Physics, University of Vienna, Vienna, 1090, Austria; Institute for Environment and Climate Research, Jinan University, Guangzhou, China
推荐引用方式 GB/T 7714	Murphy D.M.,Froyd K.D.,Bourgeois I.,et al. Radiative and chemical implications of the size and composition of aerosol particles in the existing or modified global stratosphere[J],2021,21(11).
APA	Murphy D.M..,Froyd K.D..,Bourgeois I..,Brock C.A..,Kupc A..,...&Yu P..(2021).Radiative and chemical implications of the size and composition of aerosol particles in the existing or modified global stratosphere.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(11).
MLA	Murphy D.M.,et al."Radiative and chemical implications of the size and composition of aerosol particles in the existing or modified global stratosphere".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.11(2021).