气候变化领域集成服务门户(CCPortal): Elements of the Dynamical Response to Climate Change over the Mediterranean

CCPortal

DOI	10.1175/JCLI-D-20-0429.1
	Elements of the Dynamical Response to Climate Change over the Mediterranean
	Tuel A.; O’Gorman P.A.; Eltahir E.A.B.
发表日期	2021
ISSN	0894-8755
起始页码	1135
结束页码	1146
卷号	34 期号:3
英文摘要	Future climate simulations indicate that the Mediterranean Basin will experience large low-level circulation changes during winter, characterized by a strong anomalous ridge that drives a regional precipitation decline. Previous research highlighted how shifts in stationary wave structure and the atmospheric response to reduced warming of the Mediterranean Sea relative to land could explain the development of this anomalous pressure high. Here, we expand on these results and provide new arguments for why and how the Mediterranean is projected to experience large circulation changes during winter. First, we find that zonal asymmetries in the vertical structure of stationary waves are important to explain the enhanced circulation response in the region and that these asymmetries are related through the external mode to the vertical structure of the mean zonal wind. Second, in winter, the Mediterranean is located just to the north of the Hadley cell edge and consequently is relatively free of large-scale descent; together with low near-surface static stability above the sea, this condition allows the weaker warming trend above the sea to propagate to the low troposphere and trigger a major circulation response. During summer, however, remotely forced descent and strong static stability prevent the cooling anomaly from expanding upward. Most of the intermodel scatter in the projected low-level circulation response in winter is related to the spread in upper-tropospheric dynamical trends. Importantly, because climate models exhibit too much vertical coherence over the Mediterranean, they likely overestimate the sensitivity of Mediterranean near-surface circulation to large-scale dynamical changes. © 2021 American Meteorological Society.
英文关键词	Atmospheric structure; Climate models; Troposphere; Atmospheric response; Circulation changes; Dynamical response; Mediterranean basin; Mediterranean sea; Near-surface circulation; Vertical coherence; Vertical structures; Climate change
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170926
作者单位	Ralph M. Parsons Laboratory, Massachusetts Institute of Technology, Cambridge, MA, United States; Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States
推荐引用方式 GB/T 7714	Tuel A.,O’Gorman P.A.,Eltahir E.A.B.. Elements of the Dynamical Response to Climate Change over the Mediterranean[J],2021,34(3).
APA	Tuel A.,O’Gorman P.A.,&Eltahir E.A.B..(2021).Elements of the Dynamical Response to Climate Change over the Mediterranean.Journal of Climate,34(3).
MLA	Tuel A.,et al."Elements of the Dynamical Response to Climate Change over the Mediterranean".Journal of Climate 34.3(2021).