Simulation of polar stratospheric clouds in the specified dynamics version of the whole atmosphere community climate model

摘要: [1] We evaluate the simulation of polar stratospheric clouds (PSCs) in Specified Dynamics version Whole Atmosphere Community Climate Model for Antarctic winter 2005. In this model, PSCs are assumed to form instantaneously at a prescribed supersaturation, with size distribution and number density. We use satellite observations 2005 nitric acid, water vapor, test improve PSC parameterization. Cloud-Aerosol Lidar Orthogonal Polarization since 2006 show that both hemispheres, dominant type throughout entire is mixture Nitric Acid Trihydrate (NAT) Supercooled Ternary Solutions droplets, but typical assumptions about formation model given supersaturation do not produce such population particles lead earlier removal HNO3 from gas phase compared observations. our new scheme, mixed forced by only allowing fraction total available freeze NAT remaining part STS. With approach, present winter, agreement This approach yields good terms temperature-dependent gas-phase irreversible denitrification. addition acid containing PSCs, we also investigate ice PSCs. choice required saturation ratio vapor can significantly calculated vertical