气候变化领域集成服务门户(CCPortal): Sensitivity of precipitation formation to secondary ice production in winter orographic mixed-phase clouds

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DOI	10.5194/acp-21-15115-2021
	Sensitivity of precipitation formation to secondary ice production in winter orographic mixed-phase clouds
	Dedekind Z.; Lauber A.; Ferrachat S.; Lohmann U.
发表日期	2021
ISSN	1680-7316
起始页码	15115
结束页码	15134
卷号	21 期号:19
英文摘要	The discrepancy between the observed concentration of ice nucleating particles (INPs) and the ice crystal number concentration (ICNC) remains unresolved and limits our understanding of ice formation and, hence, precipitation amount, location and intensity. Enhanced ice formation through secondary ice production (SIP) could account for this discrepancy. Here, in a region over the eastern Swiss Alps, we perform sensitivity studies of additional simulated SIP processes on precipitation formation and surface precipitation intensity. The SIP processes considered include rime splintering, droplet shattering during freezing and breakup through ice-graupel collisions. We simulated the passage of a cold front at Gotschnagrat, a peak at 2281ĝ€¯mĝ€¯a.s.l. (above sea level), on 7 March 2019 with the Consortium for Small-scale Modeling (COSMO), at a 1ĝ€¯km horizontal grid spacing, as part of the RACLETS (Role of Aerosols and CLouds Enhanced by Topography and Snow) field campaign in the Davos region in Switzerland. The largest simulated difference in the ICNC at the surface originated from the breakup simulations. Indeed, breakup caused a 1 to 3 orders of magnitude increase in the ICNC compared to SIP from rime splintering or without SIP processes in the control simulation. The ICNCs from the collisional breakup simulations at Gotschnagrat were in best agreement with the ICNCs measured on a gondola near the surface. However, these simulations were not able to reproduce the ice crystal habits near the surface. Enhanced ICNCs from collisional breakup reduced localized regions of higher precipitation and, thereby, improved the model performance in terms of surface precipitation over the domain. © Copyright:
语种	英语
scopus关键词	cloud; formation mechanism; ice crystal; orography; precipitation intensity; sensitivity analysis; winter; Alps; Davos; Graubunden; Switzerland
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/246513
作者单位	Institute of Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland
推荐引用方式 GB/T 7714	Dedekind Z.,Lauber A.,Ferrachat S.,et al. Sensitivity of precipitation formation to secondary ice production in winter orographic mixed-phase clouds[J],2021,21(19).
APA	Dedekind Z.,Lauber A.,Ferrachat S.,&Lohmann U..(2021).Sensitivity of precipitation formation to secondary ice production in winter orographic mixed-phase clouds.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(19).
MLA	Dedekind Z.,et al."Sensitivity of precipitation formation to secondary ice production in winter orographic mixed-phase clouds".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.19(2021).