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| Titel |
Impact of different convection permitting resolutions on the representation of heavy rainfall over the UK |
| VerfasserIn |
Giorgia Fosser, Elizabeth Kendon, Steven Chan |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250123749
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| Publikation (Nr.) |
 EGU/EGU2016-3054.pdf |
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| Zusammenfassung |
| The convection parameterisation schemes used global and regional climate models (with grid spacings of order 10-100 km) are a known source of model deficiencies, leading to errors in the diurnal cycle of summer precipitation and an underestimation of hourly precipitation extremes. As grid spacings approach the km-scale, the so-called “convection permitting” scale, it is possible to represent deep convection explicitly. Previous studies (e.g. Ban et al, 2015; Fosser et al, 2015; Kendon et al, 2015) have show that these convection permitting models are able to give a much more realistic representation of convection, and are needed to provide reliable projections of future changes in hourly precipitation extremes.
In this context, the UKCP18 project aims to provide policy makers with new UK climate change projections at hourly and local scales, thanks to the first ensemble of runs at convection permitting resolution. This study outlines the benefits of convection-permitting resolution in terms of the representation of heavy rainfall, and investigates the impacts of different convection permitting resolutions as well as the domain size.
Bibliography
Ban N, Schmidli J, Schär C (2015) Heavy precipitation in a changing climate: Does short-term summer precipitation increase faster? Geophys Res Lett 42:1165–1172. doi: 10.1002/2014GL062588
Fosser G, Khodayar S, Berg P (2015) Benefit of convection permitting climate model simulations in the representation of convective precipitation. Clim Dyn. doi: 10.1007/s00382-014-2242-1
Kendon EJ, Roberts NM, Fowler HJ, et al (2014) Heavier summer downpours with climate change revealed by weather forecast resolution model. Nat Clim Chang 4:570–576. doi: 10.1038/nclimate2258 |
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