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DOI10.1007/s00382-016-3132-5
Responses of European precipitation distributions and regimes to different blocking locations
Sousa, Pedro M.1; Trigo, Ricardo M.1; Barriopedro, David2,3; Soares, Pedro M. M.1; Ramos, Alexandre M.1; Liberato, Margarida L. R.1,4
2017-02-01
发表期刊CLIMATE DYNAMICS
ISSN0930-7575
EISSN1432-0894
出版年2017
卷号48
文章类型Article
语种英语
国家Portugal; Spain
英文摘要

In this work we performed an analysis on the impacts of blocking episodes on seasonal and annual European precipitation and the associated physical mechanisms. Distinct domains were considered in detail taking into account different blocking center positions spanning between the Atlantic and western Russia. Significant positive precipitation anomalies are found for southernmost areas while generalized negative anomalies (up to 75 % in some areas) occur in large areas of central and northern Europe. This dipole of anomalies is reversed when compared to that observed during episodes of strong zonal flow conditions. We illustrate that the location of the maximum precipitation anomalies follows quite well the longitudinal positioning of the blocking centers and discuss regional and seasonal differences in the precipitation responses. To better understand the precipitation anomalies, we explore the blocking influence on cyclonic activity. The results indicate a split of the storm-tracks north and south of blocking systems, leading to an almost complete reduction of cyclonic centers in northern and central Europe and increases in southern areas, where cyclone frequency doubles during blocking episodes. However, the underlying processes conductive to the precipitation anomalies are distinct between northern and southern European regions, with a significant role of atmospheric instability in southern Europe, and moisture availability as the major driver at higher latitudes. This distinctive underlying process is coherent with the characteristic patterns of latent heat release from the ocean associated with blocked and strong zonal flow patterns. We also analyzed changes in the full range of the precipitation distribution of several regional sectors during blocked and zonal days. Results show that precipitation reductions in the areas under direct blocking influence are driven by a substantial drop in the frequency of moderate rainfall classes. Contrarily, southwards of blocking systems, frequency increases in moderate to extreme rainfall classes largely determine the precipitation anomaly in the accumulated totals. In this context, we show the close relationship between the more intrinsic torrential nature of Mediterranean precipitation regimes and the role of blocking systems in increasing the probability of extreme events.


英文关键词Atmospheric blocking Precipitation Europe Weather regimes PDF
领域气候变化
收录类别SCI-E
WOS记录号WOS:000394150500025
WOS关键词ATMOSPHERIC BLOCKING ; INTERANNUAL VARIABILITY ; MOISTURE SOURCES ; EXTREME COLD ; STORM-TRACKS ; CIRCULATION ; CLIMATE ; WAVE ; SUMMER ; IMPACT
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/35263
专题气候变化
作者单位1.Univ Lisbon, Inst Dom Luiz, Fac Ciencias, P-1749016 Lisbon, Portugal;
2.Univ Complutense Madrid, Fac Ciencias Fis, Dept Fis Tierra 2, Madrid, Spain;
3.CSIC UCM, Inst Geociencias IGEO, Madrid, Spain;
4.UTAD, Escola Ciencias & Tecnol, P-5000801 Vila Real, Portugal
推荐引用方式
GB/T 7714
Sousa, Pedro M.,Trigo, Ricardo M.,Barriopedro, David,et al. Responses of European precipitation distributions and regimes to different blocking locations[J]. CLIMATE DYNAMICS,2017,48.
APA Sousa, Pedro M.,Trigo, Ricardo M.,Barriopedro, David,Soares, Pedro M. M.,Ramos, Alexandre M.,&Liberato, Margarida L. R..(2017).Responses of European precipitation distributions and regimes to different blocking locations.CLIMATE DYNAMICS,48.
MLA Sousa, Pedro M.,et al."Responses of European precipitation distributions and regimes to different blocking locations".CLIMATE DYNAMICS 48(2017).
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