NDLI: Regime-dependent evaluation of accumulated precipitation in COSMO

Content Provider	Springer Nature Link
Author	Akkermans, Tom Böhme, Tim Demuzere, Matthias Crewell, Susanne Selbach, Christoph Reinhardt, Thorsten Seifert, Axel Ament, Felix Lipzig, Nicole P. M.
Copyright Year	2011
Abstract	Regime-dependent evaluation is a relatively new approach to assess model performance. It consists of classifying the model biases according to a discrete number of regimes and evaluating model output within each regime. In this paper, the regimes are firstly defined by the large-scale atmospheric circulation, based on the objective Jenkinson-Collison classification technique which distinguishes synoptic patterns by strength, direction and vorticity of the geostrophic flow. Eight directional and two vorticity circulation regimes (circulation types) are specified. In this way, it is possible to quantify the model performance for cases with for example westerly winds only, or with cyclonic circulation only. A second regime classification is based on temperature, which allows for detection of temperature-dependent model performance. Modelled accumulated precipitation (mm/6 h) is evaluated with rain gauges for the years 2007 and 2008. Two variants of the COSMO model are evaluated: a fine-resolution version (2.8 km, COSMO-DE) and a coarse-resolution version (7 km, COSMO-EU). In COSMO-EU, a windward/leeward effect becomes visible since circulation is related to dominant wind direction, hence to windward and lee side of orography. In COSMO-DE, no circulation dependent but a height-related bias is identified and further explored, making use of temperature-dependent evaluation which unveils a positive model bias related to solid precipitation.
Starting Page	39
Ending Page	52
Page Count	14
File Format	PDF
ISSN	0177798X
Journal	Theoretical and Applied Climatology
Volume Number	108
Issue Number	1-2
e-ISSN	14344483
Language	English
Publisher	Springer Vienna
Publisher Date	2011-09-06
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution Climate Change Meteorology/Climatology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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