气候变化领域集成服务门户(CCPortal): Study of the climatological behaviors of Euro-Atlantic and West Asia blockings in the period of 1959

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DOI	10.1016/j.dynatmoce.2020.101130
	Study of the climatological behaviors of Euro-Atlantic and West Asia blockings in the period of 1959–2018
	Fahimi S.; Ahmadi-Givi F.; Meshkatee A.H.; Mazraeh Farahani M.
发表日期	2020
ISSN	03770265
卷号	89
英文摘要	In this study, comparison of blocking climatological behaviors is presented for the two periods of 1959–1988 and 1989–2018 in a part of the Northern Hemisphere including the Atlantic Ocean, Europe and West Asia regions. Blocking events were detected using a modified blocking index that is based on vertically integrated potential vorticity. By applying this index, the characteristics of detected blocking events such as frequency, duration, intensity and area were determined and compared for both the periods. According to the results, on average, 16 and 15 blocking events per year were identified in the first and second periods, respectively. The trend analysis shows that the number of blocking events in the period 1959–1988 was significantly decreased, while it was slightly increased in the period 1989–2018. Blocking activity was most prevalent from the eastern Atlantic through Europe to West Asia, but this longitude band exhibits a relatively eastward shift in the second period. In addition, the seasonal distributions are similar to those found in previous studies with the higher occurrence of blocking events during winter and autumn seasons and the lowest frequency in summer, as well as long-lasting events and greater intensity and extension in winter than the summer time, especially in the second period. These seasonal variations of blocking frequency may be due to synoptic scale eddies and planetary waves which are more active and stronger in the colder seasons than the other seasons. On the other hand, a comparison between the two periods shows that the blocking events tend to be more frequent over West Asia especially during summer in recent years. Although discrepancies between the two periods are not significant, they could be partly due to the impacts of climate change in recent decades. © 2020
英文关键词	Asia; Atlantic-European; Atmospheric blocking; Climatology; Seasonality
语种	英语
scopus关键词	Climatology; Oceanography; Asia; Atlantic-European; Atmospheric blocking; Northern Hemispheres; Potential vorticity; Seasonal distributions; Seasonality; Synoptic-scale eddies; Climate change; atmospheric blocking; climate change; climatology; comparative study; eddy; Northern Hemisphere; planetary wave; potential vorticity; seasonal variation; seasonality; synoptic meteorology; trend analysis; Atlantic Ocean; Europe; West Asia
来源期刊	Dynamics of Atmospheres and Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178324
作者单位	Department of Earth Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran; Department of Space Physics, Institute of Geophysics, University of Tehran, Iran
推荐引用方式 GB/T 7714	Fahimi S.,Ahmadi-Givi F.,Meshkatee A.H.,等. Study of the climatological behaviors of Euro-Atlantic and West Asia blockings in the period of 1959–2018[J],2020,89.
APA	Fahimi S.,Ahmadi-Givi F.,Meshkatee A.H.,&Mazraeh Farahani M..(2020).Study of the climatological behaviors of Euro-Atlantic and West Asia blockings in the period of 1959–2018.Dynamics of Atmospheres and Oceans,89.
MLA	Fahimi S.,et al."Study of the climatological behaviors of Euro-Atlantic and West Asia blockings in the period of 1959–2018".Dynamics of Atmospheres and Oceans 89(2020).