DOI: 10.5194/hess-24-5621-2020
论文题名: The 2018 northern European hydrological drought and its drivers in a historical perspective
作者: Bakke S.J. ; Ionita M. ; Tallaksen L.M.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期: 11 起始页码: 5621
结束页码: 5653
语种: 英语
Scopus关键词: Climatology
; Drought
; Groundwater
; Oceanography
; Surface waters
; Weather forecasting
; Atmospheric circulation
; Atmospheric circulation patterns
; Geopotential height anomalies
; Meteorological condition
; Meteorological drought
; Sea surface temperature anomalies
; Standardized precipitation index
; Streamflow variability
; Stream flow
; drought
; historical perspective
; hydrological modeling
; numerical model
英文摘要: In 2018, large parts of northern Europe were affected by an extreme drought. A better understanding of the characteristics and the large-scale atmospheric circulation driving such events is of high importance to enhance drought forecasting and mitigation. This paper examines the historical extremeness of the May-August 2018 meteorological situation and the accompanying meteorological and hydrological (streamflow and groundwater) drought. Further, it investigates the relation between the large-scale atmospheric circulation and summer streamflow in the Nordic region. In May and July 2018, record-breaking temperatures were observed in large parts of northern Europe associated with blocking systems centred over Fennoscandia and sea surface temperature anomalies of more than 3 °C in the Baltic Sea. Extreme meteorological drought, as indicated by the 3-month Standardized Precipitation Index (SPI3) and Standardized Precipitation Evapotranspiration Index (SPEI3), was observed in May and covered large parts of northern Europe by July. Streamflow drought in the Nordic region started to develop in June, and in July 68% of the stations had record-low or nearrecord-low streamflow. Extreme streamflow conditions persisted in the southeastern part of the region throughout 2018. Many groundwater wells had record-low or near-record-low levels in July and August. However, extremeness in groundwater levels and (to a lesser degree) streamflow showed a diverse spatial pattern. This points to the role of local terrestrial processes in controlling the hydrological response to meteorological conditions. Composite analysis of low summer streamflow and 500 mbar geopotential height anomalies revealed two distinct patterns of summer streamflow variability: One in western and northern Norway and one in the rest of the region. Low summer streamflow in western and northern Norway was related to high-pressure systems centred over the Norwegian Sea. In the rest of the Nordic region, low summer streamflow was associated with a high-pressure system over the North Sea and a low-pressure system over Greenland and Russia, resembling the pattern of 2018. This study provides new insight into hydrometeorological aspects of the 2018 northern European drought and identifies largescale atmospheric circulation patterns associated with summer streamflow drought in the Nordic region. © 2020 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162538
Appears in Collections: 气候变化与战略
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作者单位: Bakke, S.J., Department of Geosciences, University of Oslo, Oslo, Norway; Ionita, M., Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; Tallaksen, L.M., Department of Geosciences, University of Oslo, Oslo, Norway
Recommended Citation:
Bakke S.J.,Ionita M.,Tallaksen L.M.. The 2018 northern European hydrological drought and its drivers in a historical perspective[J]. Hydrology and Earth System Sciences,2020-01-01,24(11)