AS1.8

Cloud plays a critically important role in the evolution of the changing climate, because of its effects on circulation, radiative balance, and hydrological- energy budgets on both regional and global scale. The cloud processes in global circulation and climate models has been primarily represented by cumulus parameterizations. The accuracy of such parameterizations needs to be evaluated. Direct observations of cloud processes are sparse, but detailed high-resolution numerical simulations of clouds have become more and more useful as computational performances have been greatly enhanced recently. Cloud-resolving models (CRM) have been recognized as a very useful tool to investigate the effects of radiative-convective equilibriums and the subgrid scale cloud parameterizations in climate models. They also have even been included in climate models as the super-parameterization of clouds, replacing the traditional cumulus parameterizations all together. The progress during the past decade should be reviewed, and new prospects should be discussed. This session is proposed to gather all active investigators in this area for such purposes.

All the following topics relating to the research of cloud-resolving models are encouraged to submit an abstract for the upcoming session in 2011 EGU.

* Quantitative precipitation estimate/forecast
* Diurnal evolution
* Water vapor, cloud, and precipitation budgets
* Impact on radiation
* Large-scale influences (e.g., SST, moisture, wind)
* Microphysical processes (including effects of aerosol)

Several keynote speakers will be invited to summarize past available scientific results.

Invited talks:

Wei-Kuo Tao,Laboratory for Atmospheres,NASA GSFC(USA)


AS1.10

The goal of this session is to organize a joint forum for the wide range of communities concerned with atmospheric convection and its various aspects: both dynamics and chemistry, especially emphasizing the importance of cloud physics and radiation. It is intended to bring together observers, modelers, forecasters, and theoreticians. Moist convection is the most important weather phenomenon in the tropical atmosphere and the crucial component in large-scale processes such as monsoons, Madden-Julian Oscillation, ENSO. Its contribution to surface rainfall in the mid-latitudes during summer is significant. Forecasting intense precipitation events strongly hinges on our understanding of moist convection. Atmospheric convection is also a key process which controls the tropospheric composition above 5 km through vertical transport and wet deposition. The improvement of wet deposition and scavenging parameterizations are a key issue for large-scale models. A wide range of contributions will be accepted not only from those directly dealing with moist convection, but also from those studying mesoscale processes where convection plays a significant role, as well as tropical and mid-latitude cyclones, tropical meteorology, and climate dynamics.