IL-GLOBO (1.0) - development and verification of the moist convection module

The development and verification of the convec- tive module of IL-GLOBO, a Lagrangian transport model coupled online with the Eulerian general circulation model GLOBO, is described. The online-coupling promotes the full consistency between the Eulerian and the Lagrangian com- ponents of the model. The Lagrangian convective scheme is based on the Kain-Fritsch convective parametrization used in GLOBO. A transition probability matrix is computed us- ing the fluxes provided by the Eulerian KF parametrization. Then, the convective redistribution of Lagrangian particles is implemented via a Monte Carlo scheme. The formal deriva- tion is described in details and, consistently with the Eule- rian module, includes the environmental flux in the transition probability matrix to avoid splitting of the convection and subsidence processes. Consistency of the Lagrangian imple- mentation with its Eulerian counterpart is verified by com- puting environment fluxes from the transition probability ma- trix and comparing them to those computed by the Eulerian module. Assessment of the impact of the module is made for different latitudinal belts, showing that the major impact is found in the Tropics, as expected. Concerning vertical distri- bution, the major impact is observed in the boundary layer at every latitude, while in the tropical area, the influence ex- tends to very high levels.