DOI: 10.1007/s00382-017-4055-5
Scopus记录号: 2-s2.0-85039554617
论文题名: Impact of the El Niño–Southern Oscillation on the climate of Iran using ERA-Interim data
作者: Alizadeh-Choobari O. ; Adibi P. ; Irannejad P.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 51, 期: 2018-07-08 起始页码: 2897
结束页码: 2911
语种: 英语
Scopus关键词: annual variation
; climate forcing
; climate variation
; El Nino
; El Nino-Southern Oscillation
; jet stream
; La Nina
; planetary wave
; precipitation (climatology)
; Rossby wave
; sea surface temperature
; Iran
; Pacific Ocean
; Pacific Ocean (Central)
; Pacific Ocean (East)
英文摘要: The El Niño–Southern Oscillation (ENSO) is one of the dominant climate forcings affecting the interannual climate variability in many regions worldwide. Using the ERA-Interim monthly data for the period 1980–2016, for the first time the impact of the eastern Pacific (EP) and central Pacific (CP) El Niños on the climate of Iran is investigated. Results indicate that the ENSO cycle contributes to the interannual climate variability over Iran. Indeed, about 26% (23%) of the variance in annual precipitation over Iran is explained by annual SST changes in the Niño 3.4 region (annual changes of the Southern Oscillation Index). In spite of the seasonality of the ENSO signal and its interevent variability, annually all regions of Iran are anomalously wet during the EP El Niño, and dry during La Niña events. The CP El Niño events result in anomalously wet conditions over northwestern, northern, northeastern and western Iran, but dry conditions over central, eastern, southwestern, southern and southeastern Iran. However, the impact of the CP El Niño on the annual precipitation of Iran is not statistically significant, in contrast to the statistically significant impact of both La Niña and the EP El Niño. An equatorward displacement of the subtropical jet stream over Southwest Asia is found during the EP El Niño, while strengthening of the jet is found during La Niña, and they are statistically significant at the 95 % level. These changes in the position and intensity of the subtropical jet stream alter the position of the troughs and ridges of the Rossby waves and their speed, which contribute to the interannual climate variability over Iran. Equatorward displacement of the jet during the EP El Niño leads to the equatorward displacement of the Mediterranean storm track, while the intensified jet during La Niña weakens the quasi-stationary mid-tropospheric planetary waves. © 2017, Springer-Verlag GmbH Germany, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109099
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Institute of Geophysics, University of Tehran, Tehran, Iran
Recommended Citation:
Alizadeh-Choobari O.,Adibi P.,Irannejad P.. Impact of the El Niño–Southern Oscillation on the climate of Iran using ERA-Interim data[J]. Climate Dynamics,2018-01-01,51(2018-07-08)