与欧洲-大西洋和西亚大气阻塞有关的动力对流层顶变化

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Kamel Azarm, Ali R. Mohebalhojeh, Mohammad Mirzaei
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引用次数: 0

摘要

在本研究中,利用JRA-55重新分析数据,重点分析了1959–2020年冬季与阻塞事件相关的动力对流层顶异常,重点是西南亚。阻塞特性的识别和分析是基于波浪破碎指数的。为此,首先确定了阻塞的发生周期,然后研究了西亚(咸海)和欧洲-大西洋两个地区相关阻塞位置上游和下游的对流层顶异常。对不考虑强度的整个拦网事件和拦网指数较大的拦网事件进行了分析。结果表明,阻断的一般特征,如发生的位置和频率,与大多数先前的研究一致。此外,随着上述扇区阻塞的发生,阻塞发生地理区域的对流层顶特征通常会发生明确的变化。然而,在相应的大气阻塞下游,对应于亚洲西南部,对流层顶特征的变化相对较小。虽然与阻塞事件区本身相比变化较小,但预计它们将对天气系统的演变产生重要影响。对于这两个部门,具有大阻塞指数的事件群体的结果表明,相对于阻塞事件的整个群体,阻塞位置显著向东位移。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The changes in dynamical tropopause associated with the Euro-Atlantic and West-Asia atmospheric blocking

In this study, the anomalies of dynamical tropopause associated with blocking events in wintertime of the period 1959–2020 are analyzed using the JRA-55 re-analysis data with focus on the Southwest Asia. The identification and analysis of blocking properties is based on a wave breaking index. To this end, at first, the periods of occurrence of blocking are identified, and then the anomalies of the tropopause in the upstream and downstream of the relevant blocking locations in the two sectors of West Asia (Aral) and Euro–Atlantic are investigated. The analysis is carried out for the whole blocking events irrespective of their strength and blocking events with the large blocking index. Results show that the general characteristics obtained for blocking, such as location and frequency of occurrence, are in agreement with most previous studies. In addition, with the occurrence of blocking in the above-mentioned sectors, the characteristics of tropopause in the geographical area of blocking occurrence generally undergo well-defined changes. However, in the downstream of the respective atmospheric blockings, corresponding to the Southwest Asia, the changes in the characteristics of tropopause are relatively small. Although the changes are small compared to those in blocking event area itself, but they are expected to have important implications for the evolution of synoptic systems. For both the two sectors, results for the population of events with large blocking index indicate a significant eastward displacement of the location of blocking relative to that of the whole population of blocking events.

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来源期刊
Dynamics of Atmospheres and Oceans
Dynamics of Atmospheres and Oceans 地学-地球化学与地球物理
CiteScore
3.10
自引率
5.90%
发文量
43
审稿时长
>12 weeks
期刊介绍: Dynamics of Atmospheres and Oceans is an international journal for research related to the dynamical and physical processes governing atmospheres, oceans and climate. Authors are invited to submit articles, short contributions or scholarly reviews in the following areas: •Dynamic meteorology •Physical oceanography •Geophysical fluid dynamics •Climate variability and climate change •Atmosphere-ocean-biosphere-cryosphere interactions •Prediction and predictability •Scale interactions Papers of theoretical, computational, experimental and observational investigations are invited, particularly those that explore the fundamental nature - or bring together the interdisciplinary and multidisciplinary aspects - of dynamical and physical processes at all scales. Papers that explore air-sea interactions and the coupling between atmospheres, oceans, and other components of the climate system are particularly welcome.
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