COSP versions for CMIP6

The following table lists the accepted COSP versions for production of CMIP6 data. Older versions contain bugs that affect some some diagnostics or lack some capabilities, so we recommend to update to the latest version whenever possible.

COSP v1.x

VERSION	ERRORS	LIMITATIONS	DIAGNOSTICS AFFECTED	NOTES
v1.4.0	Error in treatment of mixed-phase clouds in MODIS simulator.	Unable to produce diagnostics in CFMIP3 data request: Optical_Thickness_vs_ReffICE* Optical_Thickness_vs_ReffLIQ*	MODIS simulator (field within type cosp_modis): Cloud_Fraction_Total_Mean Cloud_Fraction_Water_Mean Cloud_Fraction_Ice_Mean Cloud_Fraction_High_Mean Cloud_Fraction_Mid_Mean Cloud_Fraction_Low_Mean Optical_Thickness_Total_Mean Optical_Thickness_Water_Mean Optical_Thickness_Ice_Mean Optical_Thickness_Total_LogMean Optical_Thickness_Water_LogMean Optical_Thickness_Ice_LogMean Cloud_Particle_Size_Water_Mean Cloud_Particle_Size_Ice_Mean Cloud_Top_Pressure_Total_Mean Liquid_Water_Path_Mean Ice_Water_Path_Mean Optical_Thickness_vs_Cloud_Top_Pressure* NOTE: Most impacts are expected to affect only column fields in which mixed-phase clouds are visible from the top of the atmosphere.	Option 1: Submit to CMIP6/CFMIP3 with affected diagnostics omitted. Option 2: Update to COSPv1.4.2 The following patch (~500 lines of code) can be applied directly to your COSPv1.4 source code to update it to v1.4.2. Highlighted changes can be seen here: For v1.4.0 -> v1.4.1 For v1.4.1 -> v1.4.2
v1.4.1	Error in treatment of mixed phase clouds in MODIS simulator. There are 2 issues with the new MODIS diagnostics: 1) reported as fractional values, should be in percent and 2) require initialization.	Limitations	MODIS simulator (fields within type cosp_modis): Cloud_Fraction_Total_Mean Cloud_Fraction_Water_Mean Cloud_Fraction_Ice_Mean Cloud_Fraction_High_Mean Cloud_Fraction_Mid_Mean Cloud_Fraction_Low_Mean Optical_Thickness_Total_Mean Optical_Thickness_Water_Mean Optical_Thickness_Ice_Mean Optical_Thickness_Total_LogMean Optical_Thickness_Water_LogMean Optical_Thickness_Ice_LogMean Cloud_Particle_Size_Water_Mean Cloud_Particle_Size_Ice_Mean Cloud_Top_Pressure_Total_Mean Liquid_Water_Path_Mean Ice_Water_Path_Mean Optical_Thickness_vs_Cloud_Top_Pressure* Optical_Thickness_vs_ReffICE* Optical_Thickness_vs_ReffLIQ*	Option 1: Submit to CMIP6/CFMIP3 with affected diagnostics omitted. Option 2: Update to COSPv1.4.2. The following patch (18 lines of code) can be applied directly to your COSPv1.4.1 source code to update it to v1.4.2. Highlighted changes can be seen here.
v1.4.2	Potential divide-by-zero in MODIS and CALIPSO simulators.		See details in pull request #4 of the COSPv1 repository.	CMIP6 diagnostics not affected.
v1.4.3	Not known.			No action needed.

COSP v2.x

VERSION	ERRORS	LIMITATIONS	DIAGNOSTICS AFFECTED	NOTES
v2.0	Error in treatment of mixed-phase clouds in MODIS simulator.	Limitations	MODIS simulator (fields within type cosp_outputs): Cloud_Fraction_Total_Mean Cloud_Fraction_Water_Mean Cloud_Fraction_Ice_Mean Cloud_Fraction_High_Mean Cloud_Fraction_Mid_Mean Cloud_Fraction_Low_Mean Optical_Thickness_Total_Mean Optical_Thickness_Water_Mean Optical_Thickness_Ice_Mean Optical_Thickness_Total_LogMean Optical_Thickness_Water_LogMean Optical_Thickness_Ice_LogMean Cloud_Particle_Size_Water_Mean Cloud_Particle_Size_Ice_Mean Cloud_Top_Pressure_Total_Mean Liquid_Water_Path_Mean Ice_Water_Path_Mean Optical_Thickness_vs_Cloud_Top_Pressure* Optical_Thickness_vs_ReffICE* Optical_Thickness_vs_ReffLIQ*	Option 1: Submit to CMIP6/CFMIP3 with affected diagnostics omitted. Option 2: Update to COSPv2.0.1. This can be done by updating your local COSP repository with the master (e.g. git pull origin master). This change only impacts a few lines of code. Highlighted changes can be seen here.
v2.0.1	Not known.
v2.1	Not known.