Preprints
https://doi.org/10.5194/nhess-2021-93
https://doi.org/10.5194/nhess-2021-93

  06 Apr 2021

06 Apr 2021

Review status: a revised version of this preprint was accepted for the journal NHESS and is expected to appear here in due course.

A climatology of sub-seasonal temporal clustering of extreme precipitation in Switzerland and its impacts

Alexandre Tuel1 and Olivia Martius1,2 Alexandre Tuel and Olivia Martius
  • 1Institute of Geography and Oeschger Centre for Climate Change Research, University of Bern, Switzerland
  • 2Mobiliar Lab for Natural Risks, University of Bern, Switzerland

Abstract. 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.

Alexandre Tuel and Olivia Martius

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2021-93', Anonymous Referee #1, 28 Apr 2021
    • AC1: 'Reply on RC1', Alexandre Tuel, 06 Jul 2021
  • RC2: 'Comment on nhess-2021-93', Anonymous Referee #2, 26 May 2021
    • AC2: 'Reply on RC2', Alexandre Tuel, 06 Jul 2021
  • CC1: 'Comment on nhess-2021-93', Manuela Irene Brunner, 01 Jun 2021
    • AC3: 'Reply on CC1', Alexandre Tuel, 07 Jul 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2021-93', Anonymous Referee #1, 28 Apr 2021
    • AC1: 'Reply on RC1', Alexandre Tuel, 06 Jul 2021
  • RC2: 'Comment on nhess-2021-93', Anonymous Referee #2, 26 May 2021
    • AC2: 'Reply on RC2', Alexandre Tuel, 06 Jul 2021
  • CC1: 'Comment on nhess-2021-93', Manuela Irene Brunner, 01 Jun 2021
    • AC3: 'Reply on CC1', Alexandre Tuel, 07 Jul 2021

Alexandre Tuel and Olivia Martius

Alexandre Tuel and Olivia Martius

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Short summary
Flood events may be triggered by large accumulations of precipitation over short time periods, which can result from the successive occurrence of extreme precipitation events. We find a distinct spatio-temporal pattern in the temporal clustering behavior of precipitation extremes over Switzerland, with clustering occurring on the northern side of the Alps in winter and on their southern side in fall. Clusters tend to be followed by flood events, particularly in the southern Alps.
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