气候变化领域集成服务门户(CCPortal): Hydrological Cycle Changes Explain Weak Snowball Earth Storm Track Despite Increased Surface Baroclinicity

CCPortal

DOI	10.1029/2020GL089866
	Hydrological Cycle Changes Explain Weak Snowball Earth Storm Track Despite Increased Surface Baroclinicity
	Shaw T.A.; Graham R.J.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:20
英文摘要	Simulations show that storm tracks were weaker during past cold, icy climates relative to the modern climate despite increased surface baroclinicity. Previous work explained the weak North Atlantic storm track during the Last Glacial Maximum using dry zonally asymmetric mechanisms associated with orographic forcing. Here we show that zonally symmetric mechanisms associated with the hydrological cycle explain the weak Snowball Earth storm track. The weak storm track is consistent with the decreased meridional gradient of evaporation and atmospheric shortwave absorption and can be predicted following global mean cooling and the Clausius-Clapeyron relation. The weak storm track is also consistent with decreased latent heat release aloft in the tropics, which decreases upper tropospheric baroclinicity and mean available potential energy. Overall, both hydrological cycle mechanisms are reflected in the significant correlation between storm track intensity and the meridional surface moist static energy gradient across a range of simulated climates between modern and Snowball Earth. ©2020. The Authors.
英文关键词	Absorption cooling; Potential energy; Asymmetric mechanisms; Clausius Clapeyron relation; Hydrological cycles; Last Glacial Maximum; Latent heat release; Meridional gradients; Moist static energy; Orographic forcing; Storms; baroclinic mode; cooling; correlation; hydrological cycle; Last Glacial Maximum; latent heat flux; meridional circulation; potential energy; shortwave radiation; storm track; Atlantic Ocean; Atlantic Ocean (North)
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169557
作者单位	Department of the Geophysical Sciences, The University of Chicago, Chicago, IL, United States; Department of Physics, The University of Oxford, Oxford, United Kingdom
推荐引用方式 GB/T 7714	Shaw T.A.,Graham R.J.. Hydrological Cycle Changes Explain Weak Snowball Earth Storm Track Despite Increased Surface Baroclinicity[J],2020,47(20).
APA	Shaw T.A.,&Graham R.J..(2020).Hydrological Cycle Changes Explain Weak Snowball Earth Storm Track Despite Increased Surface Baroclinicity.Geophysical Research Letters,47(20).
MLA	Shaw T.A.,et al."Hydrological Cycle Changes Explain Weak Snowball Earth Storm Track Despite Increased Surface Baroclinicity".Geophysical Research Letters 47.20(2020).