气候变化领域集成服务门户(CCPortal): Modulation of the Occurrence of Heatwaves over the Euro-Mediterranean Region by the Intensity of the Atlantic Multidecadal Variability

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DOI	10.1175/JCLI-D-19-0982.1
	Modulation of the Occurrence of Heatwaves over the Euro-Mediterranean Region by the Intensity of the Atlantic Multidecadal Variability
	Qasmi S.; Sanchez-Gomez E.; Ruprich-Robert Y.; Boé J.; Cassou C.
发表日期	2021
ISSN	0894-8755
起始页码	1099
结束页码	1114
卷号	34 期号:3
英文摘要	The influence of the Atlantic multidecadal variability (AMV) and its amplitude on the Euro-Mediterranean summer climate is studied in two climate models, namely CNRM-CM5 and EC-Earth3P. Large ensembles of idealized experiments have been conducted in which North Atlantic sea surface temperatures are relaxed toward different amplitudes of the observed AMV anomalies. In agreement with observations, during a positive phase of the AMV both models simulate an increase (decrease) in temperature of 0.28–0.88C and a decrease (increase) in precipitation over the Mediterranean basin of 0.1–0.2 mm day21 (northern half of Europe) compared to a negative phase. Heatwave durations over the Mediterranean land regions are 40% (up to 85% over the eastern regions) longer for a moderate amplitude of the AMV. Lower and higher amplitudes lead to longer durations of;30% and;100%, respectively. A comparison with observed heatwaves indicates that the AMV can considerably modulate the current anthropogenically forced response on heatwaves durations depending on the area and on the AMV amplitude. The related anticyclonic anomalies over the Mediterranean basin are associated with drier soils and a reduction of cloud cover, which concomitantly induce a decrease (increase) of the latent (sensible) heat flux, and an enhancement of the downward radiative fluxes over lands. It is found that both tropical and extratropical forcings from the AMV are needed to trigger mechanisms, which modulate the atmospheric circulation over the Euro-Atlantic region. The amplitude of the local climate response over the Mediterranean basin evolves linearly with the amplitude of the AMV. However, the strength of this relationship differs between the models, and depends on their intrinsic biases. © 2021 American Meteorological Society.
英文关键词	Heat flux; Oceanography; Surface waters; Anticyclonic anomalies; Atmospheric circulation; Forced response; Mediterranean basin; Mediterranean region; Multidecadal variability; Radiative fluxes; Trigger mechanism; Climate models
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/170933
作者单位	CNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, France; CECI, Université de Toulouse, CNRS, Cerfacs, Toulouse, France; Barcelona Supercomputing Center, Barcelona, Spain
推荐引用方式 GB/T 7714	Qasmi S.,Sanchez-Gomez E.,Ruprich-Robert Y.,et al. Modulation of the Occurrence of Heatwaves over the Euro-Mediterranean Region by the Intensity of the Atlantic Multidecadal Variability[J],2021,34(3).
APA	Qasmi S.,Sanchez-Gomez E.,Ruprich-Robert Y.,Boé J.,&Cassou C..(2021).Modulation of the Occurrence of Heatwaves over the Euro-Mediterranean Region by the Intensity of the Atlantic Multidecadal Variability.Journal of Climate,34(3).
MLA	Qasmi S.,et al."Modulation of the Occurrence of Heatwaves over the Euro-Mediterranean Region by the Intensity of the Atlantic Multidecadal Variability".Journal of Climate 34.3(2021).