气候变化领域集成服务门户(CCPortal): Impacts of large-scale teleconnections on climate variability over Southwest Asia

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DOI	10.1016/j.dynatmoce.2019.02.001
	Impacts of large-scale teleconnections on climate variability over Southwest Asia
	Alizadeh-Choobari O.; Adibi P.
发表日期	2019
ISSN	03770265
起始页码	41
结束页码	51
卷号	86
英文摘要	The atmospheric low frequency variability at a regional or global scale is represented by teleconnection. Using monthly dataset of the Climatic Research Unit (CRU) for the period 1971–2016, the impacts of four large-scale teleconnection patterns on the climate variability over Southwest Asia are investigated. The large-scale features include the El Niño-Southern Oscillation (ENSO), the North Atlantic Oscillation (NAO) and the East Atlantic (EA) teleconnection patterns, as well as western tropical Indian Ocean (WTIO) sea surface temperature anomaly index. Results indicate that ENSO and EA are the first leading modes that explain variation of Southwest Asian precipitation, with positive (negative) anomalies during El Niño (La Niña) and the negative (positive) phase of EA. Variation of Southwest Asian near-surface temperature is most strongly related to WTIO index, with above-average (below-average) temperature during the positive (negative) phase of WTIO index, although the negative (positive) phase of NAO also favours the above-average (below-average) temperature. On the other hand, temperature (precipitation) over Southwest Asia shows the least response to ENSO (WTIO). ENSO and EA individually explain 13 percent annual variance of precipitation, while WTIO index explains 36 percent annual variance of near-surface temperature over Southwest Asia. Analysis of the European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis Interim (ERA-Interim) data indicated establishments of negative (positive) geopotential height anomalies in the middle troposphere over Southwest Asia during El Niño (La Niña) or the negative (positive) phase of NAO, EA and WTIO. The response of precipitation variability over Southwest Asia to NAO is opposite to that expected from the geopotential height anomalies, but the correlation between precipitation and NAO is not statistically significant. Due to predictability of large-scale teleconnections, results of this study are encouraging for improvement of the state-of-the-art seasonal prediction of the climate over Southwest Asia. © 2019 Elsevier B.V.
英文关键词	East Atlantic teleconnection; El Niño-Southern Oscillation; North Atlantic Oscillation; Southwest Asia; Western tropical Indian Ocean (WTIO) sea surface temperature anomaly index
语种	英语
scopus关键词	Atmospheric pressure; Atmospheric temperature; Large dataset; Oceanography; Precipitation (meteorology); Submarine geophysics; Surface properties; Surface waters; Weather forecasting; North Atlantic oscillations; Sea surface temperature anomalies; Southern oscillation; Southwest Asia; Teleconnections; Climatology; air-sea interaction; climate change; El Nino; El Nino-Southern Oscillation; geopotential; La Nina; precipitation (climatology); sea surface temperature; teleconnection; weather forecasting; Atlantic Ocean; Atlantic Ocean (East); Atlantic Ocean (North); Indian Ocean; Indian Ocean (West)
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/178518
作者单位	Institute of Geophysics, University of Tehran, Tehran, Iran
推荐引用方式 GB/T 7714	Alizadeh-Choobari O.,Adibi P.. Impacts of large-scale teleconnections on climate variability over Southwest Asia[J],2019,86.
APA	Alizadeh-Choobari O.,&Adibi P..(2019).Impacts of large-scale teleconnections on climate variability over Southwest Asia.Dynamics of Atmospheres and Oceans,86.
MLA	Alizadeh-Choobari O.,et al."Impacts of large-scale teleconnections on climate variability over Southwest Asia".Dynamics of Atmospheres and Oceans 86(2019).