| Recent climate modeling results highlighted the Arctic as a region of importance and vulnerability to global climate change. The ability to understand and simulate cloud and radiative properties is of central importance to our understanding of the Arctic climate system. The mesoscale model GESIMA is used to simulate microphysical properties and radiation process of Arctic clouds. For an idealized case, the cloud module is tested in a vertical column to study the importance of individual microphysical processes and the model's sensitivity to aerosol number concentration. For the three-dimensional simulations, the comparisons between simulations and observations show that the GESIMA model can capture the main processes in the clouds. For two aerosol scenarios, the simulation results show that the anthropogenic aerosol can alter microphysical properties of Arctic clouds, and consequently surface precipitation and radiation budget. The three-dimensional GESIMA model is sensitive to depositional nucleation process. These different parameterizations of the process have a significant effect on Ice Water Path (IWP), surface precipitation and radiation at the top of atmosphere. |
