| DOI: | 10.1007/s00382-017-3602-4
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| Scopus记录号: | 2-s2.0-85015235619
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| 论文题名: | Extreme weather events in Iran under a changing climate |
| 作者: | Alizadeh-Choobari O.; Najafi M.S.
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| 刊名: | Climate Dynamics
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| ISSN: | 9307575
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| 出版年: | 2018
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| 卷: | 50, 期:2018-01-02 | | 起始页码: | 249
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| 结束页码: | 260
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| 语种: | 英语
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| 英文关键词: | Climate change
; Extreme weather events
; Heavy precipitation
; Subtropical dry zones
; Warming
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| Scopus关键词: | climate change
; climate effect
; extreme event
; precipitation (climatology)
; subtropical region
; warming
; Iran
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| 英文摘要: | Observations unequivocally show that Iran has been rapidly warming over recent decades, which in sequence has triggered a wide range of climatic impacts. Meteorological records of several ground stations across Iran with daily temporal resolution for the period 1951–2013 were analyzed to investigate the climate change and its impact on some weather extremes. Iran has warmed by nearly 1.3 ∘C during the period 1951–2013 (+0.2 ∘C per decade), with an increase of the minimum temperature at a rate two times that of the maximum. Consequently, an increase in the frequency of heat extremes and a decrease in the frequency of cold extremes have been observed. The annual precipitation has decreased by 8 mm per decade, causing an expansion of Iran’s dry zones. Previous studies have pointed out that warming is generally associated with more frequent heavy precipitation because a warmer air can hold more moisture. Nevertheless, warming in Iran has been associated with more frequent light precipitation, but less frequent moderate, heavy and extremely heavy precipitation. This is because in the subtropical dry zones, a longer time is required to recharge the atmosphere with water vapour in a warmer climate, causing more water vapour to be transported from the subtropics to high latitudes before precipitations forms. In addition, the altitude of the condensation level increases in a warmer climate in subtropical regions, causing an overall decrease of precipitation. We argue that changing in the frequency of heavy precipitation in response to warming varies depending on the geographical location. Warming over the dry subtropical regions is associated with a decrease in the frequency of heavy precipitation, while an increase is expected over both subpolar and tropical regions. The warmer climate has also led to the increase in the frequency of both thunderstorms (driven by convective heating) and dust events over Iran. © 2017, Springer-Verlag Berlin Heidelberg. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/109485
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| 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; Faculty of Geography and Planning, University of Tabriz, Tabriz, Iran
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| Recommended Citation: | |
Alizadeh-Choobari O.,Najafi M.S.. Extreme weather events in Iran under a changing climate[J]. Climate Dynamics,2018-01-01,50(2018-01-02)
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