GASS Projects are listed below with descriptions and contact information for anyone interested in learning more about a particular project.
GEWEX Atmospheric Boundary Layer Study 3 (GABLS-3)
GABLS coordinates research on boundary layer physics to improve the representation of the atmospheric boundary layer in models. The GABLS-3 large-eddy simulation (LES) intercomparison case is based on a moderately stratified, baroclinic, mid-latitude boundary layer observed over Cabauw, the Netherlands on 1 July 2006.
Contact: Eric Bazile
This GABLS case study examines the interaction of a boundary layer of strong stability with a surface possessing a low conductivity and a high cooling potential, such as snow. The case is explored using observations at the Antarctic Plateau, and the intercomparison involves land-snow surface models, single column models, and large eddy simulations.
The objective of this project is to understand the role that convection, cloud, radiative, and dynamic processes play in the development and evolution of the MJO in order to achieve better fidelity of the MJO in global prediction models.
CAUSES is a joint GASS/DOE-RGCM/DOE-ASR project that aims to use observational data from the Atmospheric Radiation Measurement (ARM) program’s Southern Great Plains (SGP) site to understand the role that clouds have in creating the surface temperature error seen over the American mid-west in a number of general circulation models.
Contact: Ben Shipway
This project aims to create a better understanding of the differences between 3-D models in different intercomparison cases.
Contact: Adrian Lock
The Boundary Layer Cloud Projects will improve the physical parameterizations of clouds and cloud-related processes and their interactions.
The objective of CGILS is to improve understanding and simulation of boundary-layer cloud feedbacks on climate through intercomparison of LES and single-column models forced by idealized climate perturbations.
The Polar Cloud Project seeks to understand the role of dynamical and microphysical processes and their interactions in mixed-phase Arctic clouds.
Contact: Andreas Muhlbauer
CMIP investigates the microphysical and macrophysical evolution and life cycle of a synoptically-driven cirrus and to compare simulated cirrus cloud properties and radiative effects among models.
Contact: Pier Siebesma
The goals of the Grey Zone Project is to systematically explore the capability of climate and weather models to represent cloud and convective processes in the resolution range between 1 and 10 km (the so called grey zone) in support of the development of scale adaptive parameterizations for these processes. As a first activity, a comprehensive intercomparison case for a cold air outbreak such as observed during the CONSTRAIN field campaign has been developed.
CIRC is intended as an evolving and regularly updated reference source for evaluation against “line-by-line” standards of radiative transfer codes used in Global Climate Models and other atmospheric applications. CIRC differs from previous intercomparisons in that it relies on an observationally validated catalogue of cases. It is currently completing Phase I.