This work examines the effect of black carbon (BC) radiative heating on cloud droplet formation. Changes in cloud droplet concentration and cloud albedo due to the presence of black carbon are computed for different cases of aerosol size distributions, meteorological conditions, BC mixing state, and aerosol composition. We examine the effect of three new mechanisms (that result from BC heating)...

Stratus clouds are important in the regulation of the earth’s radiation budget and so play an important role in climate over both the land and ocean. Therefore, it is necessary that adequate observational databases exist for both continental and maritime boundary layer clouds. Stratus cloud and environmental properties may vary as a function of the large-scale synoptic regime. These differences...

The objective of this effort is to obtain extensive measurements in the MABL under different cloud fractions specially aimed at quantifying various statistical quantities needed to examine and develop PDF-based cloud and turbulence parameterizations. The data set produced will help us understand the characteristics of empirical PDF of various dynamic and thermodynamic variables and their releva...

Despite progress in recent years in understanding cloud processes and feedbacks in General Circulation Models (GCMs; Bony et al., 2006; Stephens 2005), knowledge is lacking about the physical mechanisms of cloud feedbacks and the causes of model-to-model variation in simulated cloud feedbacks. These issues are related to several factors: (1) the transient and spatial variability of clouds is ty...

A two-moment bulkwater parametrization scheme for warm-cloud microphysics is developed via statistical analyses of results from a detailed parcel model. This computationally efŽ cient scheme is quite accurate and produces bulkwater properties which resemble the results from a fully explicit microphysical model. It responds sensitively to the effect of aerosol types on the cloud drop number conc...

A sever thunderstorm is composed of strong convective clouds. In order to perform a simulation of this type of storms, a very fine-grid system is necessary to resolve individual convective clouds within a large domain. Since convective clouds are highly complicated systems of the cloud dynamics and microphysics, it is required to formulate detailed cloud physical processes as well as the fluid ...

This technical note introduces the Python bindings for libcloudph++. The libcloudph++ is a C++ library of algorithms for representing atmospheric cloud microphysics in numerical models. The bindings expose the complete functionality of the library to the Python users. The bindings are implemented using the Boost.Python C++ library and use NumPy arrays. This note includes listings with Python sc...

Cloud microphysics and aerosol indirect effects in the global climate model ECHAM5-HAM U. Lohmann, P. Stier, C. Hoose, S. Ferrachat, E. Roeckner, and J. Zhang Institute of Atmospheric and Climate Science, ETH Zurich, Switzerland Department of Environmental Science and Engineering, California Institute of Technology, Pasadena, USA Max Planck Institute for Meteorology, Hamburg, Germany Meteorolog...