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Defining dry/wet spells for point observations, observed area averages, and regional climate model gridboxes in Europe

Author

  • Lars Bärring
  • Tom Holt
  • Maj-Lena Linderson
  • Madej Radziejewski
  • Marco Moriondo
  • Jean P. Palutikof

Summary, in English

A new method for optimising threshold values of dry/wet spells is evaluated. A set of indices is used to find the best threshold giving good correspondence between the frequency of dry/wet spells in Hadley Centre regional model (HadRM3) output, reference observations with predetermined thresholds, and area-averaged observations. The analyses focus on selected model gridboxes in 3 different European climate regimes (Sweden, UK, Italy), where station data are available from several locations. In addition, a pan-European analysis using the European Climate Assessment (ECA) dataset is carried out. Generally, there is good agreement between point observations and the corresponding area average using the common thresholds of 0.1 or 1.0 mm with observational data. Applying the optimal thresholds on the model output is important, as it typically results in substantially better agreement between the simulated and observed series of dry/wet days. The fitted optimal pan-European dry/wet threshold is (1) 0.47 or 0.15 mm, depending on model version, for the observed point data threshold of 0.1 mm, and (2) 1.2 or 0.56 mm, depending on model version, for the threshold of 1.0 mm.

Publishing year

2006

Language

English

Pages

35-49

Publication/Series

Climate Research

Volume

31

Issue

1

Document type

Journal article

Publisher

Inter-Research

Topic

  • Physical Geography

Keywords

  • regional climate model
  • precipitation
  • areal
  • Europe
  • wet spell
  • dry spell

Status

Published

ISBN/ISSN/Other

  • ISSN: 1616-1572