Model:WACCM-EE

Contact

Name	Eric Wolf
Type of contact	Model developer
Institute / Organization	University of Colorado, ATOC
Postal address 1	Campus Box 392
Postal address 2
Town / City	Boulder
Postal code	80309
State	Colorado
Country	USA"USA" is not in the list (Afghanistan, Albania, Algeria, Andorra, Angola, Antigua and Barbuda, Argentina, Armenia, Australia, Austria, ...) of allowed values for the "Country" property.
Email address	eric.wolf@colorado.edu
Phone	240-461-8336
Fax

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WACCM-EE

Metadata

Summary Also known as Model type Modular Model part of larger framework Note on status model Date note status model Technical specs Supported platforms Unix, Linux, Mac OS Other platform Programming language Fortran77, Fortran90 Other program language Code optimized Multiple processors implemented Nr of distributed processors Nr of shared processors Start year development 2008 Does model development still take place? Yes If above answer is no, provide end year model development Code development status When did you indicate the 'code development status'? Model availability As code Source code availability (Or provide future intension) Through owner"Through owner" is not in the list (Through web repository, Through CSDMS repository) of allowed values for the "Source code availability" property. Source web address Source csdms web address Program license type GPL v2 Program license type other Memory requirements 1GB for input data Typical run time 1.5 days per model year on 8 processor mac In/Output Describe input parameters GCM initial conditions files (netcdf) files describe initial state of atmosphere up ~km 140 Input format Other input format NetCDF Describe output parameters netcdf output files describing atmospheric state, chemistry, etc Output format Other output format NetCDF Pre-processing software needed? No Describe pre-processing software Post-processing software needed? Yes Describe post-processing software IDL igeov viewer (IDL procedure) Visualization software needed? Yes If above answer is yes IDL Other visualization software Process Describe processes represented by the model General circulation model of early Earth. Particular detail is paid to chemistry, RT, and haze microphysics Describe key physical parameters and equations Equations focused on are the radiative transfer equations, and equations governing haze microphysics Describe length scale and resolution constraints Currently, 4x5 degree, with 66 vertical levels up to 140 km. Resolution can be increased if neccessary Describe time scale and resolution constraints The model takes about 4-6 model years to reach equilibrium. The modeled time period is from the Archean Earth (3.8 - 2.5 Ga) Describe any numerical limitations and issues Dynamics, chemistry, RT, microphysical, and slab ocean model are all coupled, thus the model runs slowly. Testing Describe available calibration data sets Haze microphysics can be checked against Bardeen 2008 for initial accuracy. Upload calibration data sets if available: Describe available test data sets I have numerous data sets produced by an 8 processor Mac and a local unix cluster to confirm the model is initialized correctly. Upload test data sets if available: Describe ideal data for testing Cassini data describing Titan photochemical haze. Laboratory work constraining haze properties. Other Do you have current or future plans for collaborating with other researchers? Yes, I plan on collaborating with others in particular when it comes time to rework the model chemistry modules. Is there a manual available? Yes Upload manual if available: Model website if any CCSM Model forum / discussion board Comments The Early earth haze microphysical code is working, incorporating fractal particle structures. Development is needed on linking microphysics to RT. WACCM-EE Introduction History Papers WACCM-EE Questionnaire Contact Information Model WACCM-EE Contact Person Eric Wolf (Model developer) Institution ATOC, Univ. of Colorado City Boulder, Colorado Country USA Email: eric.wolf@colorado.edu 2nd person involved: -- 3rd person involved: -- Model Description Model type: Model Description: I am developing a GCM based on NCAR's WACCM model to studied the climate of the ancient Earth. WACCM has been linked with a microphysical model (CARMA). Some important issues to be examined are the climate of the ancient Earth in light of the faint young Sun, reducing chemistry of the early atmosphere, and the production and radiative forcing of Titan-like photochemical hazes that likely enshrouded the Earth at this time. Technical Information Supported platforms: Unix, Linux, Mac OSX, Programming language: Fortran77, Fortran90 Model was developed started from: 2008 and is still going on To what degree will the model become available: As source code Current license type: GPLv2 Memory requirements: 1GB for input data Typical run time: 1.5 days per model year on 8 processor mac Input / Output Description Input parameters: GCM initial conditions files (netcdf) files describe initial state of atmosphere up ~km 140 Input format: netcdf Output parameters: netcdf output files describing atmospheric state, chemistry, etc Output format: Netcdf Post-processing software (if needed): IDL igeov viewer (IDL procedure) Visualization software (if needed): IDL Process Description Processes represented by model: General circulation model of early Earth. Particular detail is paid to chemistry, RT, and haze microphysics Key physical parameters & equations: Equations focused on are the radiative transfer equations, and equations governing haze microphysics Length scale & resolution constraints: Currently, 4x5 degree, with 66 vertical levels up to 140 km. Resolution can be increased if neccessary Time scale & resolution constraints: The model takes about 4-6 model years to reach equilibrium. The modeled time period is from the Archean Earth (3.8 - 2.5 Ga) Numerical limitations and issues : Dynamics, chemistry, RT, microphysical, and slab ocean model are all coupled, thus the model runs slowly. Testing Available calibration data sets: Haze microphysics can be checked against Bardeen 2008 for initial accuracy. Available test data sets: I have numerous data sets produced by an 8 processor Mac and a local unix cluster to confirm the model is initialized correctly. Ideal data for testing: Cassini data describing Titan photochemical haze. Laboratory work constraining haze properties. User Groups Currently or plans for collaborating with: Yes, I plan on collaborating with others in particular when it comes time to rework the model chemistry modules. Documentation Key papers of the model: Bardeen 2008 CAM Users Guide Is there a manual available: Yes Model website if any: CCSM Additional Comments Comments: The Early earth haze microphysical code is working, incorporating fractal particle structures. Development is needed on linking microphysics to RT. Issues Help Input Files Output Files Download Source