Model:WACCM-EE

WACCM-EE

Also known as
Model type	Modular
Model part of larger framework
Note on status model
Date note status model

Spatial dimensions
Spatial extent
Model domain	Climate
One-line model description	GCM for deep paleoclimate studies
Extended 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.

Keywords:	paleoclimate,

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 web repository
Source web address	http://www.cesm.ucar.edu/working_groups/WACCM/
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

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

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.

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.

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. NOTICE: REGISTRATION IS NEEDED TO RECEIVE THE SOURCE CODE. SEND THE OWNER A LETTER THAT YOU ARE INTERESTED IN THE SOURCE CODE. http://www.cesm.ucar.edu/working_groups/WACCM/

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Featured reference(s)	Open Access Status	Year	Type of Reference	Cited
Bardeen, C. G.; Toon, O. B.; Jensen, E. J.; Marsh, D. R.; Harvey, V. L.; 2008. Numerical simulations of the three-dimensional distribution of meteoric dust in the mesosphere and upper stratosphere. Journal of Geophysical Research, 113D17202. 10.1029/2007JD009515	· publishedVersion	2008	a module overview describing a module	200