DOI: 10.1038/ngeo1809
论文题名: Cloud droplet number enhanced by co-condensation of organic vapours
作者: Topping D. ; Connolly P. ; Mcfiggans G.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期: 6 起始页码: 443
结束页码: 446
语种: 英语
Scopus关键词: brightness temperature
; cloud droplet
; cloud radiative forcing
; condensation
; particulate matter
; volatile organic compound
; volatilization
; water vapor
英文摘要: Clouds profoundly influence weather and climate. The brightness and lifetime of clouds is determined by cloud droplet number concentration, in turn dictated by the number of available seed particles. The formation of cloud droplets on non-volatile atmospheric particles is well understood. However, fine particulate matter in the atmosphere ranges widely in volatility. Co-condensation of semi-volatile compounds with water increases a particle's propensity for cloud droplet formation, with potential consequences for feedbacks between the terrestrial biosphere and climate. Here we systematically study cloud droplet formation, using a cloud parcel model extended to include co-condensation of semi-volatile organic compounds under a broad variety of realistic conditions. As an air parcel rises and cools, the concentration of organic vapour that it can hold declines. Thus, the simulated organic vapours become increasingly saturated as they ascend, and so condense on growing particles as they swell into cloud droplets. We show that condensation of increasingly volatile material adds to the soluble mass of these droplets and facilitates the uptake of additional water, which leads, in turn, to a substantial increase in the number of viable cloud droplets. We suggest that the co-condensation of semi-volatile organic compounds with water vapour has a substantial impact on the radiative properties of clouds. © 2013 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106785
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Centre for Atmospheric Sciences, School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester, M13 9PL, United Kingdom
Recommended Citation:
Topping D.,Connolly P.,Mcfiggans G.. Cloud droplet number enhanced by co-condensation of organic vapours[J]. Nature Geoscience,2013-01-01,6(6)