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Revisiting the recent European droughts from a long-term perspective

机译:从长期角度重新审视最近的欧洲干旱

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摘要

Early 21st-century droughts in Europe have been broadly regarded as exceptionally severe, substantially affecting a wide range of socio-economic sectors. These extreme events were linked mainly to increases in temperature and record-breaking heatwaves that have been influencing Europe since 2000, in combination with a lack of precipitation during the summer months. Drought propagated through all respective compartments of the hydrological cycle, involving low runoff and prolonged soil moisture deficits. What if these recent droughts are not as extreme as previously thought? Using reconstructed droughts over the last 250 years, we show that although the 2003 and 2015 droughts may be regarded as the most extreme droughts driven by precipitation deficits during the vegetation period, their spatial extent and severity at a long-term European scale are less uncommon. This conclusion is evident in our concurrent investigation of three major drought types – meteorological (precipitation), agricultural (soil moisture) and hydrological (grid-scale runoff) droughts. Additionally, unprecedented drying trends for soil moisture and corresponding increases in the frequency of agricultural droughts are also observed, reflecting the recurring periods of high temperatures. Since intense and extended meteorological droughts may reemerge in the future, our study highlights concerns regarding the impacts of such extreme events when combined with persistent decrease in European soil moisture.
机译:在21世纪初,欧洲的干旱被普遍认为是异常严重,严重影响了广泛的社会经济部门。这些极端事件主要与自2000年以来一直影响欧洲的温度升高和破纪录的热浪有关,加上夏季缺乏降水。干旱蔓延到水文循环的各个区室,径流低,土壤水分亏缺时间长。如果这些最近的干旱没有以前想象的那么严重怎么办?使用过去250年中的重建干旱,我们表明,尽管2003年和2015年的干旱可能被认为是植被时期降水不足所致的最极端干旱,但在欧洲长期范围内,其空间范围和严重程度并不罕见。在我们对三种主要干旱类型(气象(降水),农业(土壤水分)和水文(网格径流)干旱)的同时调查中,这一结论显而易见。此外,还观察到土壤水分的空前干燥趋势以及相应的农业干旱频率增加,这反映了高温的反复时期。由于将来可能会再次出现强烈和长期的气象干旱,因此我们的研究突出了人们对与欧洲土壤湿度持续下降相结合的极端事件的影响的关注。

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