| GCSS |
Description |

GEWEX Cloud System Study (GCSS)
Contacts: Pier Siebesma and Christopher Bretherton
GCSS Website
|
Develop new physically-based cloud parameterizations based on cloud resolving
models of different cloud systems for numerical weather prediction and climate models.
Develop models using existing and planned campaign data sets; conduct intercomparison
workshops; and provide blueprints of cloud data requirements for new campaigns. |
|
GCSS Projects: |
|
|
DIME - Data Integration
for Model Evaluation

Contact: William Rossow
DIME Website
|
An ad hoc activitity to provide test kits for
model evaluation based on GCSS model intercomparison projects, including detailed results
from the participating cloud resolving models. |
ACPC - Joint GCSS/iLEAPS Aerosols, Clouds, Precipitation and Climate Project
GCSS Contact: Bjorn Stevens
iLEAPS Contact: Andreae Meinrat
ACPC Website
|
Joint GCSS/iLEAPS activity to obtain a quantitative understanding of the interactions between the aerosol, clouds and precipitation, and their role in the climate system. |
GCSS Working Groups: |
Description: |
Boundary Layer Clouds
Contact: Adrian Lock
Website
|
Improve
physical parameterizations of clouds and cloud related processes and their interactions. |
Cirrus Cloud Systems
Contact: Steven Dobbie
Website
|
Improve
the parameterization of cirrus cloud systems. |
Cloud Climate Feedbacks
|
Intercomparison of Large Eddy Models and Single Column Models that uses idealized large-scale dynamical conditions to evaluate subtropical marine boundary layer cloud feedback processes in GCMs. |
Cloud Microphysics
Contact: Ulrike Lohmann
Website
|
Assess and evaluate variations in the microphysical schemes commonly used for different time scales and cloud regimes in process and large-scale models. |
|
GPCI - GCSS Pacific Cross-section
Intercomparison
Contact: Joao Teixeira
Website
|
Compare
and evaluate the representation of clouds in climate and numerical weather prediction
models, both global and regional, over the sub-tropical and tropical Pacific ocean. |
|
Polar Clouds
Contact: James Pinto and Hugh Morrison
Website
|
Improve
simulations of the long-lived mixed-phase clouds found at the top of the Arctic
planetary boundary layer. |
|
Precipitating Convective Cloud Systems
Contact: Jon Petch
Website
|
Improve
the parametrization of precipitating convective cloud systems in global climate models and
numerical weather prediction models through an improved physical understanding of cloud
system processes.
|
| GLASS |
Description |

Global Land/Atmosphere System Study (GLASS)
Contact: Bart van den Hurk and Martin Best
GLASS Website
|
Coordinate the development of improved land-surface schemes for coupled
land-atmosphere models at all scales. |
GLASS Projects:
|
Description: |
ALMA - Assistance
for Land-surface Modelling Activities
Contact: Jan Polcher
Website
|
Provide
a data exchange format that is general and flexible enough to evolve with the needs of
land-surface schemes.
|

GLACE-2 - Global Land-Atmosphere
Coupling Experiment
Contact: Randal Koster
Website |
The second phase of GLACE is aimed at quantifying, across a broad range of state-of-the-art forecast models, the subseasonal forecast skill associated with the initialization of land surface state variables. The design is based upon the successful pilot experiment (GLACE-1) and is built around a comprehensive suite of 60-day forecasts that are evaluated against observed precipitation and air temperature fields.
|
LoCo - Local coupled land-atmospheric Modelling
Contact: Bart van den Hurk
Website
|
Understand,
model and predict the role of local land-atmosphere coupling in the evolution of
land-atmosphere fluxes and state variables, including clouds. |
LUCID - Land-Use and Climate, Identification of robust impacts
Contact: Andrew Pitman
Website
|
Joint GEWEX/GLASS and IGBP/iLEAPS Project to identify and quantify the impacts of land-used induced land-cover changes on the evolution of climate between the pre-industrial epoch and present-day. |

PILPS - Project for the Intercomparison of Land-surface Parameterization Schemes
Contact: Andrew Pitman
Website
|
Contribute to improved understanding of continental surface and near-surface processes through international intercomparison of current state-of-the-art parameterization schemes employed in coupled climate, atmospheric and earth system models.
|
GSWP-2 -
Global Soil Wetness Project
Website
This project concluded in 2006
|
GSWP-2
was an environmental modelling research activity. |
|
|