气候变化领域集成服务门户(CCPortal): Secondary ice production in summer clouds over the Antarctic coast: An underappreciated process in atmospheric models

CCPortal

DOI	10.5194/acp-21-755-2021
	Secondary ice production in summer clouds over the Antarctic coast: An underappreciated process in atmospheric models
	Sotiropoulou G.; Vignon E.; Young G.; Morrison H.; O'Shea S.J.; Lachlan-Cope T.; Berne A.; Nenes A.
发表日期	2021
ISSN	1680-7316
起始页码	755
结束页码	771
卷号	21 期号:2
英文摘要	pThe correct representation of Antarctic clouds in atmospheric models is crucial for accurate projections of the future Antarctic climate. This is particularly true for summer clouds which play a critical role in the surface melting of the ice shelves in the vicinity of the Weddell Sea. The pristine atmosphere over the Antarctic coast is characterized by low concentrations of ice nucleating particles (INPs) which often result in the formation of supercooled liquid clouds. However, when ice formation occurs, the ice crystal number concentrations (ICNCs) are substantially higher than those predicted by existing primary ice nucleation parameterizations. The rime-splintering mechanism, thought to be the dominant secondary ice production (SIP) mechanism at temperatures between span classCombining double low lineinline-formula-8span and span classCombining double low lineinline-formula-3/span span classCombining double low lineinline-formulagspanC, is also weak in the Weather and Research Forecasting model. Including a parameterization for SIP due to breakup (BR) from collisions between ice particles improves the ICNC representation in the modeled mixed-phase clouds, suggesting that BR could account for the enhanced ICNCs often found in Antarctic clouds. The model results indicate that a minimum concentration of about span classCombining double low lineinline-formulag1/4/span 0.1 Lspan classCombining double low lineinline-formula-1/span of primary ice crystals is necessary and sufficient to initiate significant breakup to explain the observations, while our findings show little sensitivity to increasing INPs. The BR mechanism is currently not represented in most weather prediction and climate models; including this process can have a significant impact on the Antarctic radiation budget.p © 2021 Mary Ann Liebert Inc.. All rights reserved.
英文关键词	accuracy assessment; climate modeling; cloud cover; cloud microphysics; ice crystal; sensitivity analysis; summer
语种	英语
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/168826
作者单位	Laboratory of Atmospheric Processes and Their Impacts (LAPI), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland; Department of Meteorology, Stockholm University and Bolin Center for Climate Research, Stockholm, Sweden; Environmental Remote Sensing Laboratory (LTE), EPFL, Lausanne, Switzerland; Laboratoire de Météorologie Dynamique (LMD), IPSL, Sorbonne Universite, Paris, France; School of Earth and Environment, University of Leeds, Leeds, United Kingdom; National Center for Atmospheric Research, Boulder, CO, United States; ARC Centre for Excellence in Climate System Science, University of New South Wales, Sydney, Australia; Centre for Atmospheric Science, University of Manchester, Manchester, United Kingdom; British Antarctic Survey, Cambridge, United Kingdom; ICE-HT, Foundation for Research and Technology Hellas (FORTH), Patras, Greece
推荐引用方式 GB/T 7714	Sotiropoulou G.,Vignon E.,Young G.,et al. Secondary ice production in summer clouds over the Antarctic coast: An underappreciated process in atmospheric models[J],2021,21(2).
APA	Sotiropoulou G..,Vignon E..,Young G..,Morrison H..,O'Shea S.J..,...&Nenes A..(2021).Secondary ice production in summer clouds over the Antarctic coast: An underappreciated process in atmospheric models.Atmospheric Chemistry and Physics,21(2).
MLA	Sotiropoulou G.,et al."Secondary ice production in summer clouds over the Antarctic coast: An underappreciated process in atmospheric models".Atmospheric Chemistry and Physics 21.2(2021).