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| Titel |
Discontinuous daily temperatures in the WATCH forcing data sets |
| VerfasserIn |
Henning Rust, Tim Kruschke, Andreas Dobler, Madlen Fischer, Uwe Ulbrich |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250112438
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| Publikation (Nr.) |
 EGU/EGU2015-12600.pdf |
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| Zusammenfassung |
| The WATCH forcing data sets have been created to support the use of hydrological and land
surface models for the assessment of the water cycle within climate change studies. They are
based on ECMWF reanalysis products (ERA-40 or ERA-Interim) with temperature (among
other variables) adjusted such that their monthly means match the monthly temperature data
set from the Climatic Research Unit. To this end, daily minimum, maximum and mean
temperatures within one calendar month have been subjected to a correction involving
monthly means of the respective month. As these corrections can be largely different for
adjacent months this procedure is potentially leading to unplausible differences in daily
temperatures across the boundaries of calendar months. We analyze day-to-day temperature
fluctuations within and across months and find that across months differences are
significantly larger, mostly in the tropics and frigid zones. Average across-months
differences in daily mean temperature are typically between 10% to 40% larger
than their corresponding average within-months temperature differences. However,
regions with differences up to 200% can be found in the tropical Africa. Daily
maximum and minimum temperatures are affected in the same regions but in a less sever
way. |
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