Tuel, Alexandre; Martius, Olivia (2021). A climatology of sub-seasonal temporal clustering of extreme precipitation in Switzerland and its links to extreme discharge. Natural Hazards and Earth System Sciences, 21(10), pp. 2949-2972. Copernicus Publications 10.5194/nhess-21-2949-2021
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nhess-21-2949-2021.pdf - Published Version Available under License Creative Commons: Attribution (CC-BY). Download (6MB) | Preview |
The successive occurrence of extreme precipitation events on a sub-seasonal time-scale can lead to large precipitation accumulations, a classic trigger of flood events. Here we analyse sub-seasonal clustering in Switzerland, first characterizing the tendency of precipitation extremes to cluster in time for each season separately, and second, linking the occurrence of persistent flood events to sub-seasonal clusters of precipitation extremes. We find a distinct spatio-temporal pattern in temporal clustering behavior of precipitation extremes, with temporal clustering occurring on the northern side of the Alps in winter, and on their southern side in fall. In winter, the magnitude of precipitation extremes is generally lower, and much of the precipitation falls as snow, therefore temporal clusters contribute little to the occurrence of persistent flood events. In fall, however, temporal clusters associated with large precipitation accumulations over the southern Alps are found to be almost systematically followed by floods. In addition, discharge magnitudes decrease more slowly after clustered extremes.
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