Climate Process Team (CPT): Projects at NCAR
Comparison of the NCAR and GFDL models in subsidence regions
GCSS Pacific Cross-section Intercomparison (GPCI)
Subgrid scale cloud variability: subcolumn generator and McICA method implementation
To take into account the subgrid scale cloud variability in CAM, we have implemented a subcolumn column generator. The idea of the cloud generator is that the Subgrid scale cloud variability can be represented by a set of subcolumns that are generated randomly.
We are testing the subcolumn generator on radiation calculations using the Monte Carlo Independant Column Approximation (McICA). The McICA is a method developed to improve the treatment of cloud variability in climate models. This method is essentially a sampling strategy that yields unbiased estimates of heating rate profiles with respect to the full ICA, but that speeds the calculation up compared to the full ICA.
Forecast runs with the UW scheme
We are testing the UW atmospheric boundary layer scheme with CAM3 runs in forecast mode. The goal is to provide insight into parameterization errors which ultimately could lead to model improvements. Our effort follows the CAPT protocol. In the CAPT protocol, we realistically initialize CAM3 with NWP analyses, and we then run the model in forecast mode to determine the drift from the NWP analyses and/or from available field data. This method allows us to diagnose model parameterization deficiencies. This project is a collaboration with the LLNL.
AcknowledgmentsThis research is supported by the National Science Foundation.