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CFMIP observational simulator package (COSP)

ISCCP simulator

CFMIP observational datasets (at IPSL)

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COSP quicklooks

All output is calculated from the monthly-mean for a single January of a model integration, and January 2008 from the observations. We show plots for the GA6 configuration of the UM (left), CESM 1.1.2 (centre), and observations (right).

ISCCP-simulator map of total cloud cover

Calculated from the joint histogram of cloud cover as a function of cloud-top pressure and optical thickness by summing over all CTP-tau bins including the bins with tau smaller 0.3 bins (first column in the plots below). Instead of observations, the quantity is compared to the model's total cloud cover field as computed by the model itself without the use of the ISCCP simulator (bottom row in the plots below). This is the field usually called CLT in CMIP archives. The comparison plot displays the difference between ISCCP total cloud cover and its model CLT field.

ISCCP-simulator globally-averaged pc-tau joint histogram

Global area-weighted average from all points with valid data. Note that per standard practice, only points that are sunlit in the month will have data. Relative to observations, model plots have an extra optical thickness bin for tau less than 0.3.

CloudSat Simulator global map of cloud volume fraction

Sum fractions over all height and reflectivity bins with reflectivity greater than -25 dBZ and divide by the number of height bins.

CloudSat Tropical-averaged Countered Frequency by Altitude Diagram (CFAD)

Area-weighted average from all tropical points. Tropical points are defined as 30S to 30N. Note that model plots have additional reflectivity bins for dBZ smaller than -25.

MODIS-simulator global map of total cloud cover

Calculated from the joint histogram of cloud cover as a function of cloud-top pressure and optical thickness by summing over all CTP-tau bins with tau greater than 0.3 bins. Observational counterpoint is Cloud_Fraction_Mask_Total_Mean in CFMIP-OBS dataset.

MODIS-simulator globally-averaged CTP-tau joint histogram

Global area-weighted average from all points with valid data. Note that per standard practice, only points that are sunlit in the month will have data. Relative to observations, model plots have an extra optical thickness bin for tau less than 0.3.

MODIS-simulator liquid effective radius

Time means are calculated as [clwmodis*reffclwmodis]/[clwmodis]. Square brackets denote time averages.

MODIS-simulator ice effective radius

Time means are calculated as [climodis*reffclimodis]/[climodis]. Square brackets denote time averages.

MISR-simulator global map of total cloud cover

Calculated from the joint histogram of cloud cover as a function of cloud-top height and optical thickness by summing over all CTH-tau bins with tau > 0.3 bins.

MISR-simulator globally-averaged height-tau joint histogram

Global area-weighted average from all points with valid data. Note that per standard practice, only points that are sunlit in the month will have data. Relative to observations, model plots have an extra optical thickness bin for tau less than 0.3.

CALIPSO-simulator global map of total cloud cover

Map of variable cltcalipso.

CALIPSO-simulator globally-averaged height-scattering ratio histogram (CFAD)

Global average of variable cfadLidarsr532.