气候变化领域集成服务门户(CCPortal): Technical note: Parameterising cloud base updraft velocity of marine stratocumuli

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DOI	10.5194/acp-22-4523-2022
	Technical note: Parameterising cloud base updraft velocity of marine stratocumuli
	Ahola, Jaakko; Raatikainen, Tomi; Alper, Muzaffer Ege; Keskinen, Jukka-Pekka; Kokkola, Harri; Kukkurainen, Antti; Lipponen, Antti; Liu, Jia; Nordling, Kalle; Partanen, Antti-Ilari; Romakkaniemi, Sami; Raisanen, Petri; Tonttila, Juha; Korhonen, Hannele
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	4523
结束页码	4537
卷号	22 期号:7 页码:15
英文摘要	The number of cloud droplets formed at the cloud base depends on both the properties of aerosol particles and the updraft velocity of an air parcel at the cloud base. As the spatial scale of updrafts is too small to be resolved in global atmospheric models, the updraft velocity is commonly parameterised based on the available turbulent kinetic energy. Here we present alternative methods through parameterising updraft velocity based on high-resolution large-eddy simulation (LES) runs in the case of marine stratocumulus clouds. First we use our simulations to assess the accuracy of a simple linear parameterisation where the updraft velocity depends only on cloud top radiative cooling. In addition, we present two different machine learning methods (Gaussian process emulation and random forest) that account for different boundary layer conditions and cloud properties. We conclude that both machine learning parameterisations reproduce the LES-based updraft velocities at about the same accuracy, while the simple approach employing radiative cooling only produces on average lower coefficient of determination and higher root mean square error values. Finally, we apply these machine learning methods to find the key parameters affecting cloud base updraft velocities.
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:000778880900001
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/273931
作者单位	Finnish Meteorological Institute; Finnish Meteorological Institute; Australian National University; Australian National University
推荐引用方式 GB/T 7714	Ahola, Jaakko,Raatikainen, Tomi,Alper, Muzaffer Ege,et al. Technical note: Parameterising cloud base updraft velocity of marine stratocumuli[J],2022,22(7):15.
APA	Ahola, Jaakko.,Raatikainen, Tomi.,Alper, Muzaffer Ege.,Keskinen, Jukka-Pekka.,Kokkola, Harri.,...&Korhonen, Hannele.(2022).Technical note: Parameterising cloud base updraft velocity of marine stratocumuli.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(7),15.
MLA	Ahola, Jaakko,et al."Technical note: Parameterising cloud base updraft velocity of marine stratocumuli".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.7(2022):15.