Parameterization of large-scale dynamics for convection studies: Recent developments and new extensions.

Abstract:

Starting with the weak temperature gradient method about 15 years ago, a number of methods for parameterization of large-scale dynamics have been developed and used in single-column or cloud-resolving numerical models for studies of deep tropical convection. In this talk I will describe several developments:

1. The maturation of these methods for idealized studies, as marked by an intercomparison project under the Global Atmospheric Systems Study (GASS), from which I will show a result or two;
2. The use of these methods to simulate specific time-dependent observations, especially the Madden-Julian oscillation;
3. The extension of the notion of the parameterization of large-scale dynamics outside the tropics. Specifically I will describe an approach based on the quasi-geostrophic omega equation, and show some results from its application to observed extreme precipitation events.