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DOI | 10.1016/j.atmosres.2020.105368 |
The climatological impact of the upper-tropospheric Rossby wave propagation on the Red Sea trough in winter | |
Alizadeh Z.; Mohebalhojeh A.R.; Ahmadi-Givi F.; Mirzaei M.; Khansalari S. | |
发表日期 | 2020 |
ISSN | 0169-8095 |
英文摘要 | There is a prominent feature in the climate of the northeast Africa that, once activated, may cause heavy rainfall occurrence in large parts of the eastern Mediterranean (EM) and the Arabian Peninsula. The feature is Red Sea Trough (RST) which is an inverted trough of low pressure at lower troposphere wave over the northeast Africa and the Red Sea. This study investigates the way Rossby wave propagation in the upper troposphere may change the circulation of the lower troposphere and thus the surface weather in the northeast Africa, the Red Sea and the EM regions on a monthly time scale. The interaction between the wave activity flux at the 300 hPa level and the lower tropospheric circulation is investigated with consideration of the meteorological quantities at different levels of the troposphere in a wide region from the western North Atlantic to the EM. For this, two critical phases of the wave activity flux are defined. The critical positive (negative) phase corresponds to the months during which the amount of wave activity entering the region of study is higher (lower) than the climatological mean plus (minus) one standard deviation. The results show that during the critical positive phase, in the northeast Africa, the mean meridional circulation is strengthened throughout the troposphere. Further consequences of the positive phase are the strengthening and interconnection of the divergence cores of the Atlantic and Mediterranean storm tracks, strengthening of the RST and thus locally-unstable conditions leading to higher monthly precipitation in large parts of the study region. © 2020 Elsevier B.V. |
英文关键词 | Mediterranean storm track; North Atlantic storm track; Northeast Africa and Red Sea regions; Red Sea trough; Rossby wave propagation; Wave activity flux |
语种 | 英语 |
scopus关键词 | Fluxes; Mechanical waves; Precipitation (meteorology); Wave propagation; Eastern Mediterranean; Mediterranean storms; Meridional circulation; Prominent features; ROSSBY wave propagation; Tropospheric circulation; Unstable conditions; Wave-activity flux; Troposphere |
来源期刊 | Atmospheric Research |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/161993 |
作者单位 | Institute of Geophysics, University of Tehran, Tehran, Iran; Atmospheric Science and Meteorological Research Center, Tehran, Iran |
推荐引用方式 GB/T 7714 | Alizadeh Z.,Mohebalhojeh A.R.,Ahmadi-Givi F.,et al. The climatological impact of the upper-tropospheric Rossby wave propagation on the Red Sea trough in winter[J],2020. |
APA | Alizadeh Z.,Mohebalhojeh A.R.,Ahmadi-Givi F.,Mirzaei M.,&Khansalari S..(2020).The climatological impact of the upper-tropospheric Rossby wave propagation on the Red Sea trough in winter.Atmospheric Research. |
MLA | Alizadeh Z.,et al."The climatological impact of the upper-tropospheric Rossby wave propagation on the Red Sea trough in winter".Atmospheric Research (2020). |
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