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Intermittency analysis of dry spell magnitude and timing using different spell definitions
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NSTL
Elsevier
This study investigated the variability of intermittency with dry spells delineated using various definitions based on fixed minimum rainfall thresholds, dynamic thresholds using daily evapotranspiration rates, accumulated rainfall thresholds, or detrimental climatic conditions that coincided with consecutive dry spell days. The different spell definitions clearly effected the magnitude and timing of the average and extreme behaviour of the spell lengths for a temperate climate in Central-North Europe. Although high synchronicity for dry spells was found for some definitions, detected dry spells frequently fell into very different time periods, which was particularly pronounced for the annual maximum spells. It was concluded that there is not a 'common' or 'correct' dry spell definition but that any intermittency analysis requires a clear definition of the purpose of the study a priori. Whether it is zero rainfall or requirements for (plant) water supplies, rainwater harvesting, or pollution control, the spell definition must be set accordingly. Similarly, there can be no consistent definition for a long or rare dry spell; besides the effects of the geographic setting, the absolute differences between spell definitions are larger than differences due to various return intervals.
NSTL
Elsevier
