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On the curious case of the recent decade, mid-spring precipitation deficit in central Europe
npj Climate and Atmospheric Science ( IF 9 ) Pub Date : 2020-12-07 , DOI: 10.1038/s41612-020-00153-8
M. Ionita , V. Nagavciuc , R. Kumar , O. Rakovec

Central Europe has experienced a severe drought almost every April for the last 14 years consecutively, driven by record high temperatures, low flows, high evapotranspiration, and high soil moisture deficit. The dynamic of this recent and recurrent mid-spring dryness is not yet understood. Here we show that the period 2007–2020 was characterized by a reduction of ~50% of the usual April rainfall amount over large areas in central Europe. The precipitation deficit and the record high temperatures were triggered by a multiyear recurrent high-pressure system centered over the North Sea and northern Germany and a decline in the temperature gradient between the Arctic region and the mid-latitudes, which diverted the Atlantic storm tracks northward. From a long-term perspective, the precipitation, temperature, and soil moisture anomalies observed over the last 14 years have reached the highest amplitudes over the observational record. Our study provides an in-depth analysis of the hydroclimate extremes in central Europe over the last 140 years and their atmospheric drivers, enabling us to increase our dynamical understating of long-term dry periods, which is vital to enhance forecasting and mitigation of such events.



中文翻译:

在最近十年的奇怪情况下,中欧春季中部降雨不足

由于创纪录的高温,低流量,高蒸散量和高土壤水分亏缺,中欧几乎连续四个月都连续四月遭受严重干旱。近期和春季中期干燥的动态还不清楚。在这里,我们表明,2007-2020年期间,中欧大部分地区的4月正常降雨量减少了约50%。降水不足和创纪录的高温是由以北海和德国北部为中心的多年反复高压系统以及北极地区和中纬度之间的温度梯度下降引起的,这使大西洋风暴轨迹向北转移。从长远来看,降水,温度,在过去的14年中观察到的土壤湿度异常在观测记录中达到了最大幅度。我们的研究提供了对过去140年中欧极端水文气候极端事件及其大气驱动因素的深入分析,使我们能够增加长期干旱时期的动态低估状态,这对于增强此类事件的预报和缓解至关重要。

更新日期:2020-12-07
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