气候变化领域集成服务门户(CCPortal): Black Carbon Aerosols in the Lower Free Troposphere are Heavily Coated in Summer but Largely Uncoated in Winter at Jungfraujoch in the Swiss Alps

CCPortal

DOI	10.1029/2020GL088011
	Black Carbon Aerosols in the Lower Free Troposphere are Heavily Coated in Summer but Largely Uncoated in Winter at Jungfraujoch in the Swiss Alps
	Motos G.; Corbin J.C.; Schmale J.; Modini R.L.; Bertò M.; Kupiszewski P.; Baltensperger U.; Gysel-Beer M.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:14
英文摘要	Black carbon (BC) particles are responsible for substantial radiative heating of the atmosphere. However, the climate-relevant properties of BC particles in the free troposphere (FT) are poorly constrained over longer time scales. Here, we report on in situ, intensive field campaigns deploying a single-particle soot photometer during summer and winter seasons at the Jungfraujoch (3,580 m a.s.l., Switzerland), a site often located in the lower FT. The refractory BC (rBC) mass size distribution was very stable across the two seasons. BC was generally internally mixed (i.e., heavily coated with other aerosol material) in summer. However, against general expectations, BC was predominantly externally mixed in winter, with a high occurrence of negligibly-to-thinly coated BC. This strong seasonality in lower-FT BC mixing state has not been previously observed and would substantially influence the lifetime, loading, and climate effects of free-tropospheric BC. Future measurements should investigate the generality of these results. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Aerosols; Carbon; Fog; Black carbon aerosol; Climate effects; Field campaign; Free troposphere; Mass size distribution; Radiative heating; Single particle; Winter seasons; Troposphere; aerosol composition; black carbon; heating; photometer; radiative forcing; seasonality; size distribution; soot; troposphere; Alps; Bern [Switzerland]; Jungfraujoch; Switzerland
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170093
作者单位	Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen, Switzerland; Now at Metrology Research Centre, National Research Council Canada, Ottawa, ON, Canada; Now at Extreme Environments Research Laboratory, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland; Now at Geodetic Institute, Norwegian Mapping Authority, Hønefoss, Norway
推荐引用方式 GB/T 7714	Motos G.,Corbin J.C.,Schmale J.,et al. Black Carbon Aerosols in the Lower Free Troposphere are Heavily Coated in Summer but Largely Uncoated in Winter at Jungfraujoch in the Swiss Alps[J],2020,47(14).
APA	Motos G..,Corbin J.C..,Schmale J..,Modini R.L..,Bertò M..,...&Gysel-Beer M..(2020).Black Carbon Aerosols in the Lower Free Troposphere are Heavily Coated in Summer but Largely Uncoated in Winter at Jungfraujoch in the Swiss Alps.Geophysical Research Letters,47(14).
MLA	Motos G.,et al."Black Carbon Aerosols in the Lower Free Troposphere are Heavily Coated in Summer but Largely Uncoated in Winter at Jungfraujoch in the Swiss Alps".Geophysical Research Letters 47.14(2020).