期刊
JOURNAL OF CLIMATE
卷 32, 期 11, 页码 3169-3187出版社
AMER METEOROLOGICAL SOC
DOI: 10.1175/JCLI-D-18-0331.1
关键词
Atmosphere; Europe; Anticyclones; Drought; Climate change; Evapotranspiration
资金
- Spanish Ministerio de Educacion, Cultura y Deporte [FPU16/01972]
- Ramon y Cajal Programme [RYC-2014-15036]
- STEADY project [CGL2017-83198-R]
- Spanish Ministerio de Economia y Competitividad - Spanish Ministerio de Economia y Competitividad
- FEDER [CGL2014-52135-C03-01]
- European Commission [PCIN-2015-220]
- FORMAS
- DLR
- BMWFW
- MINECO
- ANR (FR)
- European Union [690462]
- Xunta de Galicia [ED431C 2017/64-GRC]
- Programa de Consolidacion e Estructuracion de Unidades de Investigacion Competitivas
- Mitigation (IMDROFLOOD) [PCIN-2015-243]
- Spanish Government
- FEDER through the SETH project [CGL2014-60849-JIN]
- Xunta of Galicia, Spain
- ERC Grant [338965-A2C2]
We have analyzed the record-breaking drought that affected western and central Europe from July 2016 to June 2017. It caused widespread impacts on water supplies, agriculture, and hydroelectric power production, and was associated with forest fires in Iberia. Unlike common continental-scale droughts, this event displayed a highly unusual spatial pattern affecting both northern and southern European regions. Drought conditions were observed over 90% of central-western Europe, hitting record-breaking values (with respect to 1979-2017) in 25% of the area. Therefore, the event can be considered as the most severe European drought at the continental scale since at least 1979. The main dynamical forcing of the drought was the consecutive occurrence of blocking and subtropical ridges, sometimes displaced from their typical locations. This led to latitudinal shifts of the jet stream and record-breaking positive geopotential height anomalies over most of the continent. The reduction in moisture transport from the Atlantic was relevant in the northern part of the region, where decreased precipitation and increased sunshine duration were the main contributors to the drought. On the other hand, thermodynamic processes, mostly associated with high temperatures and the resulting increase in atmospheric evaporative demand, were more important in the south. Finally, using flow circulation analogs we show that this drought was more severe than it would have been in the early past.
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