气候变化领域集成服务门户(CCPortal): Impacts of Latent Energy and Snow Fall Speed on a Wintertime Midlatitude Cyclone

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DOI	10.1029/2020JD032655
	Impacts of Latent Energy and Snow Fall Speed on a Wintertime Midlatitude Cyclone
	Collins E.; Lebo Z.J.; Morrison H.
发表日期	2020
ISSN	2169897X
卷号	125 期号:19
英文摘要	This study aimed to understand the impacts of latent energy as well as snow fall speeds on precipitation properties and synoptic-scale storm characteristics of a wintertime midlatitude cyclone. Simulations of a potent winter storm that impacted the Rocky Mountains and northern Great Plains of the United States in February 2017 were performed using the Weather Research and Forecasting model with latent heating or cooling from individual microphysical processes systematically turned off and fall speeds adjusted by ±50%. Results indicated substantial impacts on the microphysical characteristics of the simulated storm to fall speed, cooling from sublimation, and warming from deposition. The impacts of cooling and warming were manifested as differences in accumulated snowfall. Increased (decreased) fall speeds led to smaller (larger) ice crystals and total mass, resulting in offsetting effects on the precipitation flux, and thus minimal impacts on snowfall and large-scale characteristics of the storm. Warming and cooling associated with deposition and sublimation, respectively, impacted the synoptic-scale dynamics, whereby removing warming from deposition resulted in an increased meridional temperature gradient near the jet stream, thus increasing the jet strength and causing it to be more westerly with less curvature aloft. This in turn limited upper-level divergence, creating a weaker surface low and shifting the precipitation shield southward. The opposite occurred with the removal of latent cooling due to sublimation. This study highlights the potential importance of latent energy associated with ice sublimation and deposition and fall speeds in the larger-scale characteristics of winter storms. ©2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185727
作者单位	Department of Atmospheric Science, University of Wyoming, Laramie, WY, United States; Mesoscale and Microscale Meteorology Laboratory, National Center for Atmospheric Research, Boulder, CO, United States
推荐引用方式 GB/T 7714	Collins E.,Lebo Z.J.,Morrison H.. Impacts of Latent Energy and Snow Fall Speed on a Wintertime Midlatitude Cyclone[J],2020,125(19).
APA	Collins E.,Lebo Z.J.,&Morrison H..(2020).Impacts of Latent Energy and Snow Fall Speed on a Wintertime Midlatitude Cyclone.Journal of Geophysical Research: Atmospheres,125(19).
MLA	Collins E.,et al."Impacts of Latent Energy and Snow Fall Speed on a Wintertime Midlatitude Cyclone".Journal of Geophysical Research: Atmospheres 125.19(2020).