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www.geosci-model-dev-discuss.net/4/971/2011/
doi:10.5194/gmdd-4-971-2011
© Author(s) 2011. This work is distributed
under the Creative Commons Attribution 3.0 License.
iGen: the automated generation of a parameterisation of entrainment in marine stratocumulus
1School of Mathematics, University of Manchester, Manchester, UK
2School of Earth and Environment, University of Leeds, Leeds, UK
Abstract. In a previous paper we described a new technique for automatically generating parameterisations using a program called iGen. iGen generates parameterisations by analysing the source code of a high resolution model that resolves the physics to be parameterised. In order to demonstrate that this technique scales up to deal with models of realistic complexity we have used iGen to generate a parameterisation of entrainment in marine stratocumulus. We present details of our technique in which iGen was used to analyse the source code of a cloud resolving model and generate a parameterisation of the mean and standard deviation of entrainment velocity in marine stratocumulus in terms of the large-scale state of the boundary layer. The parameterisation was tested against results from the DYCOMS-II intercomparison of cloud resolving models and iGen's parameterisation of mean entrainment velocity was found to be 5.27 × 10−3 ± 0.62 × 10−3 m s−1 compared to 5.2 × 10−3 ± 0.8 × 10−3 m s−1 for the DYCOMS-II ensemble of cloud resolving models.
Discussion Paper (PDF, 628 KB) Supplement (18 KB) Interactive Discussion (Closed, 3 Comments) Final Revised Paper (GMD)
Notice on Discussion StatusCitation: Tang, D. F. and Dobbie, S.: iGen: the automated generation of a parameterisation of entrainment in marine stratocumulus, Geosci. Model Dev. Discuss., 4, 971-995, doi:10.5194/gmdd-4-971-2011, 2011. Bibtex EndNote Reference Manager XML
