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Page Properties
1.Poster TitlePerturbed Convection Parameter Experiments: Sensitivity to ACME and CESM vertical resolution
2.Authors

Richard Neale, Cecile Hannay, Po-Lun Ma

3.GroupAtmosphere
4.ExperimentWatercycle
5.Poster CategoryEarly Result
6.Submission TypePoster
7.Poster Link
8.Lightning Talk Slide Neale_ACME_Jun16_hlite.pdf

 

Abstract

 

The parameterization of deep convection in the ACME atmosphere model continues to be based upon the Zhang-McFarlane (1995, ZM) parameterization scheme. Only moderate adjustments have been made to this scheme since the CCSM4 version of the NCAR model. In preparation for the v1.0 version of the model we have probed many of the parameters key to the operation of the ZM scheme. Initially, these sensitivity experiments were performed in CAM5.5, a largely similar configuration to v1.0 in it's moist physics representation. A range of parameters that are not frequently used as tuning parameters were investigated including parcel temperature perturbations, downdraft fraction and CAPE microphysical calculation assumptions. The aims of this study were two-fold. To improve South American DJF rainfall biases, which currently have a severe impact on the Amazon land surface due to excessive dryness, and to increase the strength of tropical modes of variability which remain poor from the v0.3 version. 

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