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Evaluation of the model representation of the evolution of convective systems using satellite observations of outgoing longwave radiation

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Pearson, K. J., Hogan, R. J., Allan, R. P., Lister, G. M. S. and Holloway, C.E. (2010) Evaluation of the model representation of the evolution of convective systems using satellite observations of outgoing longwave radiation. Journal of Geophysical Research, 115. A20206. ISSN 0148-0227

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To link to this article DOI: 10.1029/2010JD014265

Abstract/Summary

We introduce a technique for assessing the diurnal development of convective storm systems based on outgoing longwave radiation fields. Using the size distribution of the storms measured from a series of images, we generate an array in the lengthscale-time domain based on the standard score statistic. It demonstrates succinctly the size evolution of storms as well as the dissipation kinematics. It also provides evidence related to the temperature evolution of the cloud tops. We apply this approach to a test case comparing observations made by the Geostationary Earth Radiation Budget instrument to output from the Met Office Unified Model run at two resolutions. The 12km resolution model produces peak convective activity on all lengthscales significantly earlier in the day than shown by the observations and no evidence for storms growing in size. The 4km resolution model shows realistic timing and growth evolution although the dissipation mechanism still differs from the observed data.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical and Physical Sciences > Department of Meteorology
Faculty of Science > School of Mathematical and Physical Sciences > Environmental Systems Science Centre
Faculty of Science > School of Mathematical and Physical Sciences > NCAS
ID Code:8171
Uncontrolled Keywords:convection; modeling; evaluation; GERB; Atmospheric Processes: Convective processes; Remote sensing; Africa; Mathematical Geophysics: Instruments and techniques; Computational Geophysics: Data presentation and visualization
Publisher:American Geophysical Union

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