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

Climate Research

Maciej Radziejewski¹  Tom Holt¹  Lars Bärring¹  Maj-Lena Linderson¹  Marco Moriondo¹  Jean P. Palutikof¹ 

关键词: Dry spell;    Wet spell;    Regional climate model;    Precipitation;    Areal precipitation;    Europe;   

DOI  :  10.3354/cr031035

来源: Inter-Research Science Publishing

【 摘 要 】

ABSTRACT: 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.

【 授权许可】

Unknown