气候变化领域集成服务门户(CCPortal): Role of the East Asian trough on the eastern Mediterranean temperature variability in early spring and the extreme case of 2004 warm spell

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DOI	10.1007/s00382-019-04847-5
	Role of the East Asian trough on the eastern Mediterranean temperature variability in early spring and the extreme case of 2004 warm spell
	Bozkurt D.; Ezber Y.; Sen O.L.
发表日期	2019
ISSN	0930-7575
起始页码	2309
结束页码	2326
卷号	53 期号:2020-03-04
英文摘要	This study investigates the potential influence of the East Asian trough (EAT) on the eastern Mediterranean temperature variability in early spring. In connection with this, it also examines the extreme case of the year 2004 when anomalous warming of the eastern Anatolia resulted in unprecedented snowmelt runoff amounts in the Euphrates and Tigris basins in early March. In the analyses, we used reanalysis data, gridded products of surface temperature and snow cover, river discharge data and satellite imagery. We employed an intensity index for the EAT and a trough displacement index for the Mediterranean trough (MedT) to explore the relationship between the strength of the EAT and the displacement of the MedT at pentad resolution. Our analysis shows that there are statistically significant correlations (at 99% confidence level) between the strength of the EAT and the zonal shift of the MedT on some pentads (e.g., 3rd, 13th, 37th and 59th), but that the highest correlation occurs on the 13th pentad of the year corresponding to the early days of March. It seems that, on this pentad, when the EAT is strong, the MedT tends to be located in the west of its climatological position (about 30 - 35 ∘E) which causes warmer conditions over the eastern Mediterranean. In 2004, which appears to be an extreme year for this phenomenon, the MedT is positioned and deepened in the central Mediterranean (about 10 - 15 ∘E), and extended towards central Africa during the early days of March. This synoptic pattern provided favorable conditions for the development of a tropical plume/atmospheric river with a southwest-northeast orientation, carrying warm tropical African air towards the eastern Mediterranean and Anatolian highlands resulting in rapid melting of the snowpack as well as severe precipitation, and thus flooding events, in the eastern Anatolia. A key finding in our analysis is that the strengthening of the EAT was instrumental to the increased amplitude of the ridge-trough system over the Euro-Mediterranean region in the early days of 2004 spring. We highlight that the response of surface and upper level meteorological conditions to the amplitude of the ridge-trough system enhanced by the strength of the EAT might be crucial in the understanding of some of the extreme hydrometeorological events in the eastern Mediterranean region. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Atmospheric river; Atmospheric teleconnections; Euphrates-Tigris Rivers; Euro-Mediterranean; Hydrometeorological extreme events; Rossby wave
语种	英语
scopus关键词	confidence interval; extreme event; hydrometeorology; river discharge; Rossby wave; snowmelt; spring (season); teleconnection; temperature profile; trough; warming; Euphrates River; Far East; Mediterranean Sea; Mediterranean Sea (East); Tigris River
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146099
作者单位	Department of Geophysics, Center for Climate and Resilience Research, University of Chile, Santiago, Chile; Eurasia Institute of Earth Sciences, Istanbul Technical University, Istanbul, Turkey
推荐引用方式 GB/T 7714	Bozkurt D.,Ezber Y.,Sen O.L.. Role of the East Asian trough on the eastern Mediterranean temperature variability in early spring and the extreme case of 2004 warm spell[J],2019,53(2020-03-04).
APA	Bozkurt D.,Ezber Y.,&Sen O.L..(2019).Role of the East Asian trough on the eastern Mediterranean temperature variability in early spring and the extreme case of 2004 warm spell.Climate Dynamics,53(2020-03-04).
MLA	Bozkurt D.,et al."Role of the East Asian trough on the eastern Mediterranean temperature variability in early spring and the extreme case of 2004 warm spell".Climate Dynamics 53.2020-03-04(2019).