气候变化领域集成服务门户(CCPortal): Seasonal updraft speeds change cloud droplet number concentrations in low-level clouds over the western North Atlantic

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DOI	10.5194/acp-22-8299-2022
	Seasonal updraft speeds change cloud droplet number concentrations in low-level clouds over the western North Atlantic
	Kirschler, Simon; Voigt, Christiane; Anderson, Bruce; Braga, Ramon Campos; Chen, Gao; Corral, Andrea F.; Crosbie, Ewan; Dadashazar, Hossein; Ferrare, Richard A.; Hahn, Valerian; Hendricks, Johannes; Kaufmann, Stefan; Moore, Richard; Poehlker, Mira L.; Robinson, Claire; Scarino, Amy J.; Schollmayer, Dominik; Shook, Michael A.; Thornhill, K. Lee; Winstead, Edward; Ziemba, Luke D.; Sorooshian, Armin
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	8299
结束页码	8319
卷号	22 期号:12 页码:21
英文摘要	To determine the impact of dynamic and aerosol processes on marine low clouds, we examine the seasonal impact of updraft speed w and cloud condensation nuclei concentration at 0.43 % supersaturation (N-CCN0.43%) on the cloud droplet number concentration (N-C) of low-level clouds over the western North Atlantic Ocean. Aerosol and cloud properties were measured with instruments on board the NASA LaRC Falcon HU-25 during the ACTIVATE (Aerosol Cloud meTeorology Interactions oVer the western ATlantic Experiment) mission in summer (August) and winter (February-March) 2020. The data are grouped into different N-CCN0.43% loadings, and the density functions of N-C and w near the cloud bases are compared. For low updrafts (w < 1.3 m s(-1)), N-C in winter is mainly limited by the updraft speed and in summer additionally by aerosols. At larger updrafts (w > 3 m s(-1)), N-C is impacted by the aerosol population, while at clean marine conditions cloud nucleation is aerosol-limited, and for high N-CCN0.43% it is influenced by aerosols and updraft. The aerosol size distribution in winter shows a bimodal distribution in clean marine environments, which transforms to a unimodal distribution in high N-CCN0.43% due to chemical and physical aerosol processes, whereas unimodal distributions prevail in summer, with a significant difference in their aerosol concentration and composition. The increase of N-CCN0.43% is accompanied with an increase of organic aerosol and sulfate compounds in both seasons. We demonstrate that N-C can be explained by cloud condensation nuclei activation through upwards processed air masses with varying fractions of activated aerosols. The activation highly depends on w and thus supersaturation between the different seasons, while the aerosol size distribution additionally affects N-C within a season. Our results quantify the seasonal influence of w and N-CCN0.43% on N-C and can be used to improve the representation of low marine clouds in models.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000817096400001
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/273492
作者单位	Helmholtz Association; German Aerospace Centre (DLR); Johannes Gutenberg University of Mainz; National Aeronautics & Space Administration (NASA); NASA Langley Research Center; Southern Cross University; University of Arizona; Leibniz Institut fur Tropospharenforschung (TROPOS); Leipzig University; University of Arizona
推荐引用方式 GB/T 7714	Kirschler, Simon,Voigt, Christiane,Anderson, Bruce,et al. Seasonal updraft speeds change cloud droplet number concentrations in low-level clouds over the western North Atlantic[J],2022,22(12):21.
APA	Kirschler, Simon.,Voigt, Christiane.,Anderson, Bruce.,Braga, Ramon Campos.,Chen, Gao.,...&Sorooshian, Armin.(2022).Seasonal updraft speeds change cloud droplet number concentrations in low-level clouds over the western North Atlantic.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(12),21.
MLA	Kirschler, Simon,et al."Seasonal updraft speeds change cloud droplet number concentrations in low-level clouds over the western North Atlantic".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.12(2022):21.