Model of Emissions of Gases and Aerosols from Nature (MEGAN)

MEGAN is a modeling system for estimating the net emission of gases and aerosols from terrestrial ecosystems into the atmosphere. Driving variables include landcover, weather, and atmospheric chemical composition. MEGAN is a global model with a base resolution of ~ 1 km and so is suitable for regional and global models. A FORTRAN code is available for generating emission estimates for the CMAQ regional air quality model. The algorithms have also been incorporated as an on-line component in several regional and global chemistry and transport models. Global distributions of landcover variables (Emission Factors, Leaf Area Index, and Plant Functional Types) are available for spatial resolutions ranging from ~ 1 to 100 km and in several formats (ARCGIS, netcdf).

 

User Guides:

1. FORTRAN code User Guide: Describes how to download and run a FORTRAN code that generates biogenic emission estimates for CMAQ.

2. Data Portal User Guide: Describes how to access the code and input data.

3. Input Data Preprocessor User Guide: Describes how to regrid the landcover input data for a specific model domain using a GIS.

 

MEGAN versions:

We have assigned version numbers to the MEGAN FORTRAN code as well as the input data.

The current version of the FORTRAN code is v2.04 (released October 29, 2007)

The current version of the landcover data include

Any of the landcover datasets (i.e. version 2.0 or version 2.1) can be used as inputs for the FORTRAN code v2.04.

 

MEGAN Publications:

 

 

Contact Alex Guenther (guenther@ucar.edu) with questions or suggestions regarding MEGAN