Can CAPE be used as a post-processing tool for systematic errors in shortwave radiation forecasts?

This report is a result of research into the use of CAPE as a representation of convective instability in the atmosphere and convective clouds. These clouds would result in differing values of shortwave radiation (SW) and could produce a possible systematic error in reanalysis data. Through post-processing this systematic error could be reduced to create a better representation of SW in reanalysis over Ireland.

A climatology of CAPE for Great Britain found three main CAPE seasons:
‘land dominated CAPE’ between April and September, ‘Sea dominated CAPE’ between September and January and ‘low CAPE’ from January to April [Holley et al., 2014]. Similar results were found for Ireland.

Initial data analysis found no clear conclusions in correlations or analysis of large SW error events. CAPE is highly variable both spatially and temporally. As the ability of a model to accurately simulate CAPE
depends heavily on the vertical grid spacing in the critical layers, the plan is to return to this research later with a higher resolution model.

CAPE as a post-processing parameter