Emissions overview

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Here is a quick overview of the emissions inventories that are currently available in GEOS-Chem.

Anthropogenic emissions

Please see our Anthropogenic emissions wiki page for a listing of available species by inventory.

--Bob Y. 16:04, 13 February 2015 (EST)

Biofuel emissions

Please see our Biofuel_emissions wiki page for a complete list of biofuel inventories available for use with GEOS-Chem.

--Bob Y. 17:17, 13 February 2015 (EST)

Biogenic emissions

Biogenic species (Isoprene, Monoterpenes, Methyl Butenol) are emitted following the MEGAN model inventory. Please see our MEGAN biogenic emissions wiki page for more information.

--Bob Y. 17:18, 13 February 2015 (EST)

Biomass burning

GFED is the recommended biomass burning emission inventory. GFED3 will be used for model versions 9-01-02 and later, while GFED2 is available for previous versions. GFED includes emission factors for gas-phase species (NOx, CO, ALK4, ACET, MEK, ALD2, PRPE, C3H8, CH2O, C2H6), aerosol species (SO2, NH3, BC, OC), and CO2.

Most of these are also anthropogenic emissions species.

--Mcooper 12:59, 9 August 2011 (EDT)
--Bob Y. 15:09, 20 December 2012 (EST)

Other NOx emissions sources

Please see the following wiki pages for information about other sources of NOx emissions:

  1. NOx emissions from aircraft
  2. NOx emissions from lightning
  3. NOx emissions from soils

--Bob Y. 14:40, 17 March 2010 (EDT)

Aerosol emissions

Please see our Aerosol emissions wiki page for a full description of the inventories which contain aerosol species (e.g. SO2, SO4, NH3, NH4, etc.)

--Bob Y. 14:40, 17 March 2010 (EDT)

Inventory History

The following table describes important changes to the emission inventories:

Version Released Description Contact
v9-02 TBD AEIC aircraft emissions Sebastian Eastham (MIT)
Steven Barrett (MIT)
v9-02 TBD EDGAR v4.2 CH4 emissions Kevin Wecht (Harvard)
v9-02 TBD RCP future emission scenarios Chris Holmes (UC Irvine)
v9-02 TBD New soil NOx emission module Rynda Hudman Kay (EPA)
Neil Moore (formerly of Dalhousie)
Bram Maasakkers (Eindhoven)
v9-01-03 Sep 2012 Improved acetone simulation Emily Fischer (Harvard)
v9-01-03 Sep 2012 Complete shift of biogenic VOC emissions from GEIA to MEGAN; retire GEIA Dylan Millet
v9-01-03 Sep 2012 OVOC's dry deposition Jingqiu Mao (NOAA/GFDL)
v9-01-03 Sep 2012 Historical emission inventories of SO2, NOx, BC, and POA Eric Leibensperger (MIT)
v9-01-03 Sep 2012 PARANOX model for evolution of ship exhaust plumes Geert Vinken (Eindhoven)
v9-01-02 Nov 2011 Update biomass burning emissions to GFED3 Prasad Kasibhatla
v9-01-02 Nov 2011 Implementation of RETRO Anthropogenic VOC emissions W. Reinhart, U. of Minnesota
v9-01-01 Feb 2011 Updated lightning parameterization and fix for cloud-top-height algorithm L. Murray, Harvard
v9-01-01 Feb 2011 Updated volcanic SO2 emissions from Aerocom J. Fisher (Harvard)
v8-03-01 May 2010 Extension of annual anthropogenic scale factors to 2006 A. van Donkelaar, Dalhousie
v8-03-01 May 2010 Emissions for Nested NA/EU Simulations Nested Grid A. van Donkelaar, Dalhousie
v8-03-01 May 2010 Emissions for Global 1 x 1.25 simulation capability L. Lamsal, Dalhousie
v8-03-01 May 2010 Speciated biogenic emissions from MEGAN v2.1 now used in SOA code H. Pye, Caltech
v8-02-04 Feb 2010 EPA/NEI2005 regional emissions inventory for North America P. Le Sager (formerly Harvard),
A. van Donkelaar (Dalhousie)
v8-02-04 Feb 2010 MEGAN v2.1 biogenic emissions Mike Barkley, Edinburgh
v8-02-03 Oct 2009 ICOADS ship emissions Chulkyu Lee, Dalhousie
v8-02-03 Oct 2009 Updated OTD/LIS redistribution factors for GEOS-5 Lee Murray, Harvard

Please see the following documentation for information on previous model versions:

Documents like these will no longer be produced. Information on the current model version can be found throughout the wiki.

Emissions regridding issues

Different regridding approaches have been tried in order to prepare for model simulations at the GEOS-5 native resolution of 0.5x0.667, or other high resolution possibilities.

With each step in regridding, information is reorganized in such a way that it cannot be recovered by later regridding in the reverse direction, therefore, optimal regridding is done in a single step. This means that when input emissions data are provided on a given grid, the optimal approach (to avoid losing information) is to leave them on that grid, read them into the model and regrid in the code to the desired resolution. This is the approach currently used for GFEDv2 which comes in on a generic 1x1 grid (360x180).

In GEOS-Chem v9-01-02 and earlier versions, the model does a 2-step regridding using functions from regrid_1x1_mod.f in the following way:

1) function DO_REGRID_G2G_1x1 regrids generic_1x1 --> GEOS_1x1

2) function DO_REGRID_1x1 regrids GEOS_1x1 --> desired resolution

The above is not equivalent to the single step regridding carried out in IDL (regridH.pro).

An alternative is to use the Fortran regridding code map_a2a (developed by S.-J. Lin and refined by Bob Yantosca). I have experimented with this in the model and have it working for some situations but the code has a single option for half-polar grids. This permits direct regridding from an input half-polar grid to an output half-polar grid, or an input full-polar grid to an output full-polar grid, but does not properly regrid between full-polar and half-polar.

Figures depicting CO2 differences in the net terrestrial exchange field which was on a generic 1x1 grid then regridded to 2x2.5 for a model simulation using different approaches (IDL regridh.pro, regrid_1x1_mod, and map_a2a) are shown below, to emphasize that a single-step regridding approach is the best universal approach.


-- Ray Nassar 16:22, 10 May 2011 (EDT)

MAP_A2A regridding algorithm

Prasad Kasibhatla and Matt Cooper have implemented the MAP_A2A algorithm into GEOS-Chem. This update was tested in the 1-month benchmark simulation v9-01-03k and approved on 27 Apr 2012.

Please visit our Regridding in GEOS-Chem wiki page for the latest information about the MAP_A2A regridding algorithm, including bug fixes and updates.

--Bob Y. 15:57, 28 August 2012 (EDT)