气候变化领域集成服务门户(CCPortal): Sensitivity of mixed-phase moderately deep convective clouds to parameterizations of ice formation

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DOI	10.5194/acp-21-3627-2021
	Sensitivity of mixed-phase moderately deep convective clouds to parameterizations of ice formation - An ensemble perspective
	K. Miltenberger A.; R. Field P.
发表日期	2021
ISSN	1680-7316
起始页码	3627
结束页码	3642
卷号	21 期号:5
英文摘要	The formation of ice in clouds is an important processes in mixed-phase and ice-phase clouds. Yet, the representation of ice formation in numerical models is highly uncertain. In the last decade, several new parameterizations for heterogeneous freezing have been proposed. However, it is currently unclear what the effect of choosing one parameterization over another is in the context of numerical weather prediction. We conducted high-resolution simulations (1x D 250 m) of moderately deep convective clouds (cloud top 18 C) over the southwestern United Kingdom using several formulations of ice formation and compared the resulting changes in cloud field properties to the spread of an initial condition ensemble for the same case. The strongest impact of altering the ice formation representation is found in the hydrometeor number concentration and mass mixing ratio profiles. While changes in accumulated precipitation are around 10 %, high precipitation rates (95th percentile) vary by 20 %. Using different ice formation representations changes the outgoing short-wave radiation by about 2.9Wm2 averaged over daylight hours. The choice of a particular representation for ice formation always has a smaller impact then omitting heterogeneous ice formation completely. Excluding the representation of the Hallett- Mossop process or altering the heterogeneous freezing parameterization has an impact of similar magnitude on most cloud macro- and microphysical variables with the exception of the frozen hydrometeor mass mixing ratios and number concentrations. A comparison to the spread of cloud properties in a 10- member high-resolution initial condition ensemble shows that the sensitivity of hydrometeor profiles to the formulation of ice formation processes is larger than sensitivity to initial conditions. In particular, excluding the Hallett-Mossop representation results in profiles clearly different from any in the ensemble. In contrast, the ensemble spread clearly exceeds the changes introduced by using different ice formation representations in accumulated precipitation, precipitation rates, condensed water path, cloud fraction, and outgoing radiation fluxes. © 2021 BMJ Publishing Group. All rights reserved.
语种	英语
scopus关键词	computer simulation; convective cloud; ensemble forecasting; freezing; ice; numerical model; parameterization; United Kingdom
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/247075
作者单位	Institute for Atmospheric Physics, Johannes Gutenberg University, Mainz, Germany; Institute of Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, United Kingdom; Met Office, Exeter, United Kingdom
推荐引用方式 GB/T 7714	K. Miltenberger A.,R. Field P.. Sensitivity of mixed-phase moderately deep convective clouds to parameterizations of ice formation - An ensemble perspective[J],2021,21(5).
APA	K. Miltenberger A.,&R. Field P..(2021).Sensitivity of mixed-phase moderately deep convective clouds to parameterizations of ice formation - An ensemble perspective.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(5).
MLA	K. Miltenberger A.,et al."Sensitivity of mixed-phase moderately deep convective clouds to parameterizations of ice formation - An ensemble perspective".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.5(2021).