Global modeling of mixed-phase clouds: The albedo and lifetime effects of aerosols

摘要: [1] We present a global modeling study of mixed‐phase clouds and have performed sensitivity simulations to explore the ways in which aerosol particles can affect this type cloud. This extends previous similar studies that it takes into account not only so‐called lifetime effects on but also their albedo. Our findings generally agree with an increase ice‐nucleating (IN) leads decreased cloud therefore warming Earth‐atmosphere system. However, IN will decrease ice crystal sizes, thereby increasing albedo, is analogous well‐established Twomey effect liquid clouds. effective radii albedo hence cooling counteracts Taking both account, we find net radiative forcing be positive small, contrast much stronger found if taken account. The latter has been common approach so far. Results were extremely sensitive choice heterogeneous freezing parameterization maximum fraction black carbon available for nucleation.