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Precipitation Climatology in an Ensemble of CORDEX-Africa Regional Climate Simulations
SMHI, Forskningsavdelningen, Klimatforskning - Rossby Centre.ORCID-id: 0000-0002-4226-8713
SMHI, Forskningsavdelningen, Klimatforskning - Rossby Centre.
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2012 (engelsk)Inngår i: Journal of Climate, ISSN 0894-8755, E-ISSN 1520-0442, Vol. 25, nr 18, s. 6057-6078Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

An ensemble of regional climate simulations is analyzed to evaluate the ability of 10 regional climate models (RCMs) and their ensemble average to simulate precipitation over Africa. All RCMs use a similar domain and spatial resolution of similar to 50 km and are driven by the ECMWF Interim Re-Analysis (ERA-Interim) (1989-2008). They constitute the first set of simulations in the Coordinated Regional Downscaling Experiment in Africa (CORDEX-Africa) project. Simulated precipitation is evaluated at a range of time scales, including seasonal means, and annual and diurnal cycles, against a number of detailed observational datasets. All RCMs simulate the seasonal mean and annual cycle quite accurately, although individual models can exhibit significant biases in some subregions and seasons. The multimodel average generally outperforms any individual simulation, showing biases of similar magnitude to differences across a number of observational datasets. Moreover, many of the RCMs significantly improve the precipitation climate compared to that from their boundary condition dataset, that is, ERA-Interim. A common problem in the majority of the RCMs is that precipitation is triggered too early during the diurnal cycle, although a small subset of models does have a reasonable representation of the phase of the diurnal cycle. The systematic bias in the diurnal cycle is not improved when the ensemble mean is considered. Based on this performance analysis, it is assessed that the present set of RCMs can be used to provide useful information on climate projections over Africa.

sted, utgiver, år, opplag, sider
2012. Vol. 25, nr 18, s. 6057-6078
HSV kategori
Forskningsprogram
Klimat
Identifikatorer
URN: urn:nbn:se:smhi:diva-436DOI: 10.1175/JCLI-D-11-00375.1ISI: 000309038000001OAI: oai:DiVA.org:smhi-436DiVA, id: diva2:806632
Tilgjengelig fra: 2015-04-21 Laget: 2015-04-14 Sist oppdatert: 2017-12-04bibliografisk kontrollert

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