|
|
 |
|
|
|
|
|
| |
Information - AS1.09 Dynamics and chemistry of atmospheric moist convection: A variation under a Theme on the Capacity of CRM
 |
|
|
|
Event Information |
|
|
|
|
|
|
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 phenomena in the tropical atmosphere, and the crucial component in large--scale processes such as monsoons, Madden--Julian waves, ENSO. Its contribution to surface rainfall in the mid-latitudes during summer, with or without coupling to the synoptic-scale dynamics, is significant. Forecasting intense precipitation events strongly hinges on our understanding of moist convection. Furthermore, the vertical transport of chemical species by moist convection affects global atmosphere chemistry.
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.
______________________________________________________________________________
This year, we will place special emphasis (but not exclusively, see
above) on the question of the capacity of the cloud-resolving models
(CRMs) to 'realistically' simulate convective processes. To a certain degree, it may be argued that this capacity of CRMs has long been established, and the use of CRMs can be considered as a standard procedure for evaluating convective parameterizations. However, it should also be realized that hitherto CRM verifications have mostly been focused on the large-scale averages, roughly corresponding to grid-box means in global modelling contexts.
Details of the smaller-scale structures have not been much scrutinized in spite of the fact that these details are exactly what are needed in order to verify various formulations behind parameterizations.
For fields like radiation, even large-scale averages depend on unresolved issues related to microphysics and motions that remain unresolved in CRMs. Subtle questions arise when CRMs are applied to 'explicitly' compute convective transport of chemical species, with various numerical difficulties in handling the fine-scale advection processes accurately and appropriate specification of chemical boundary conditions. Finally, this question becomes extremely timely with an advent of super-parameterizations:
placing CRMs in each grid-box of a global model in place of standard parameterizations.
We plan to organize a workshop-type forum within this session in order to discuss CRM issues specifically.
Which aspects of CRMs are treated realistically-detailed comparisons with observations, stringent numerical tests, sensitivities to microphysics and dimensionality, etc.? Accepting current limitations of CRMs, how can we best use them?
|
|
|
|
|
|
|
|
|
|
|
Preliminary List of Solicited Speakers |
|
|
|
|
|
|
|
|
|
|
 Back to Session Programme
|
|
|
|
