伊朗客观气候区降水和干旱异常

IF 1.4 Q2 GEOGRAPHY
S. Ghaedi
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引用次数: 2

摘要

通过对伊朗113个天气站的降水进行区域化,研究了1988年至2017年30年间每个地区的降水特征和干旱发生情况。海拔、纬度和距水源的距离造成了伊朗境内强烈的东西向和南北向降水梯度,使里海东部和中部地区的年平均降水量从55毫米增加到西南海岸的1730毫米。层次聚类分析确定了伊朗的六个降水区,包括干旱、半干旱、中度、半湿润、湿润和高湿润地区。对标准化降水指数的调查显示,约19%的站点的趋势正在显著下降。在65%的车站中,这一数字没有显著下降,在不到1%的车站中大幅上升,在15%的车站中也没有显著上升。虽然伊朗大部分地区的干旱发生率有所上升,但仅在该国北部地带的一些站点,干旱发生率却有所下降。超过84%的站点的线路坡度代表SPI的负值,这证实了伊朗干旱发生率的增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Anomalies of precipitation and drought in objectively derived climate regions of Iran
By regionalizing precipitation in 113 synoptic stations in Iran, the characteristics of precipitations and the occurrence of droughts in each region were investigated over a period of 30 years, 1988–2017. Elevation, latitude and distance from moisture source have caused strong East–West and South–North gradients of precipitation across the territory of Iran so that the average annual precipitation increases from 55 mm in the eastern and central regions to 1,730 mm in the south-west coast of the Caspian Sea. Hierarchical cluster analysis identified six precipitation regions in Iran, including the arid, semi-arid, moderate, semi-humid, humid, and high humid regions. An investigation of the standardized precipitation index (SPI) showed that the trend in about 19 per cent of stations was significantly decreasing. It was non-significantly decreasing in 65 per cent, significantly increasing in less than 1 per cent, and non-significantly increasing in 15 per cent of the stations. While the occurrence of drought has increased in most parts of Iran, it has decreased in some stations only in the northern strip of the country. The line slope in more than 84 per cent of the stations represent negative values in SPI, which confirms an increase in the occurrence of droughts in Iran.
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来源期刊
Hungarian Geographical Bulletin
Hungarian Geographical Bulletin Social Sciences-Geography, Planning and Development
CiteScore
3.20
自引率
0.00%
发文量
24
审稿时长
24 weeks
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