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Extreme weather events in Iran under a changing climate

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Abstract

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 \(^{\circ }\)C during the period 1951–2013 (+0.2 \(^{\circ }\)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.

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Acknowledgements

The financial support of the University of Tehran for this research under the Grant number 30449/1/03 is acknowledged.

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Authors and Affiliations

  1. Institute of Geophysics, University of Tehran, Tehran, Iran

    Omid Alizadeh-Choobari

  2. Faculty of Geography and Planning, University of Tabriz, Tabriz, Iran

    M. S. Najafi

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  1. Omid Alizadeh-Choobari
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  2. M. S. Najafi
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Correspondence to Omid Alizadeh-Choobari.

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Alizadeh-Choobari, O., Najafi, M.S. Extreme weather events in Iran under a changing climate. Clim Dyn 50, 249–260 (2018). https://doi.org/10.1007/s00382-017-3602-4

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