Emissions overview: Difference between revisions

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Here is a quick overview of the emissions inventories that are currently available in GEOS-Chem.
#REDIRECT [[HEMCO data directories]]
 
== Anthropogenic emissions ==
 
Please also see our table of species listed by inventory on our [[Anthropogenic emissions]] wiki page.
 
=== EDGAR (Default inventory) ===
 
Starting with v9-01-02, the default anthropogenic emissions in GEOS-Chem come from the [[Anthropogenic emissions#EDGAR|global EDGAR emissions inventory]]. In previous versions, the [[Anthropogenic emissions#GEIA/Piccot|GEIA/Piccot]] inventory was the default. EDGAR can be overwritten by one or more [[Anthropogenic emissions#Regional inventories|regional emissions inventories]] in various locations of the globe (e.g. N. America, Asia, Europe, etc.).
 
=== RETRO ===
 
[[Implementation_of_RETRO_Anthropogenic_Emissions|RETRO anthropogenic VOC emissions]] are available beginning with version 9-01-02, and are the recommended default VOC emission inventories. The RETRO inventory has improved temporal and spatial resolution and a more inclusive suite of speciated NMVOCs than many of the other optional inventories.
 
=== Anthropogenic emissions of aerosols ===
 
Several aerosol species have anthropogenic emissions.  Please see our [[Aerosol emissions#Anthropogenic emissions|aerosol emissions page]] for more information about these inventories.
 
=== Ship emissions ===
 
[[Ship emissions|Emissions from ship exhaust]] from several global (e.g. [[Anthropogenic emissions#EDGAR|EDGAR]]) and regional (e.g. [[Anthropogenic emissions#EMEP|EMEP]] etc.) inventories can also be selected.
 
=== Annual scale factors ===
 
Several of the emission inventories are for a particular year or range of years.  To obtain emissions for years outside of the given range, [[Scale factors for anthropogenic emissions|interannual scale factors must be applied]].
 
== Biofuel emissions ==
 
The default biofuel inventory is that of [[Biofuel emissions#Yevich and Logan|''Yevich and Logan'' <nowiki>[2003]</nowiki>]].  This inventory can be overwritten by:
 
* [[EPA/NEI99 North American emissions|EPA/NEI99 biofuel emissions]] over N. America
* [[Anthropogenic emissions#David Streets|David Streets et al 2006 biofuel emissions]] over SE Asia
 
Please see our [[Biofuel emissions|biofuel emissions wiki page]] for more detailed information.
 
== Biogenic emissions ==
 
=== MEGAN ===
 
Biogenic species (Isoprene, Monoterpenes, Methyl Butenol) are emitted following the MEGAN model inventory. Please see our [[MEGAN biogenic emissions]] wiki page for more information.
Also see our [[Emissions Working Group#GEOS-Chem Emissions Issues(please add yours!)|Isoprene Emission Estimates in the Literature]] page for Isoprene Emission Estimates in the literature.
 
=== GEIA ===
 
Originally, GEOS-Chem emitted biogenic species from the [[Biogenic emissions#GEIA|GEIA biogenic emissions inventory]]. This option was removed in version 9-01-03, but remains available as an option in previous versions.
 
== Biomass burning ==
 
GFED is the recommended [[Biomass_burning_emissions|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|anthropogenic emissions species]].
 
--[[User:Mcooper|Mcooper]] 12:59, 9 August 2011 (EDT)
 
== Other NOx emissions sources ==
 
Please see the following wiki pages for information about other sources of NOx emissions:
 
# [[Aircraft emissions#NOx|NOx emissions from aircraft]]
# [[Lightning NOx emissions|NOx emissions from lightning]]
# [[Soil NOx emissions|NOx emissions from soils]]
 
--[[User:Bmy|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.)
 
--[[User:Bmy|Bob Y.]] 14:40, 17 March 2010 (EDT)
 
== Inventory History ==
 
The following table describes important changes to the emission inventories:
 
{| border=1 cellspacing=0 cellpadding=5
|-bgcolor="#CCCCCC" valign="top"
!Version
!Released
!Description
!Contact
 
|-valign="top"
|[[GEOS-Chem v9-01-02|v9-01-02]]
|Nov 2011
|Retirement of GEIA biogenic emissions
|E. Fischer (Harvard)<br>D. Millet (U. Minnesota)
 
|-valign="top"
|[[GEOS-Chem v9-01-02|v9-01-02]]
|Nov 2011
|[[Sources_and_Sinks_Working_Group#Available_Historical_and_Future_Emissions | Historical SO2, NOx, BC and POA emissions]]
|Eric Leibensperger (MIT)
 
|-valign="top"
|[[GEOS-Chem v9-01-02|v9-01-02]]
|Nov 2011
|[[Biomass_burning_emissions#GFED3 | Update biomass burning emissions to GFED3]]
|Prasad Kasibhatla
 
|-valign="top"
|[[GEOS-Chem v9-01-02|v9-01-02]]
|Nov 2011
|[[Implementation_of_RETRO_Anthropogenic_Emissions | Implementation of RETRO Anthropogenic VOC emissions]]
|W. Reinhart, U. of Minnesota
 
|-valign="top"
|[[GEOS-Chem v9-01-01|v9-01-01]]
|Feb 2011
|[http://seas.harvard.edu/~ltmurray/LNOx.v9-01-01.Release.Notes.pdf Updated lightning parameterization and fix for cloud-top-height algorithm]
|L. Murray, Harvard
 
|-valign="top"
|[[GEOS-Chem v9-01-01|v9-01-01]]
|Feb 2011
|[[Volcanic SO2 emissions from Aerocom#Data for v9-01-01 and newer versions|Updated volcanic SO2 emissions from Aerocom]]
| J. Fisher (Harvard)
 
|-valign="top"
|[[GEOS-Chem v8-03-01|v8-03-01]]
|May 2010
|[[Scale factors for anthropogenic emissions| Extension of annual anthropogenic scale factors to 2006]]
|A. van Donkelaar, Dalhousie
 
|-valign="top"
|[[GEOS-Chem v8-03-01|v8-03-01]]
|May 2010
|Emissions for Nested NA/EU Simulations [[GEOS-Chem nested grid simulations|Nested Grid]]
|A. van Donkelaar, Dalhousie
 
|-valign="top"
|[[GEOS-Chem v8-03-01|v8-03-01]]
|May 2010
|Emissions for Global 1 x 1.25 simulation capability
|L. Lamsal, Dalhousie
 
|-valign="top"
|[[GEOS-Chem v8-03-01|v8-03-01]]
|May 2010
|[[Secondary organic aerosols#Speciated biogenic emissions from MEGAN|Speciated biogenic emissions from MEGAN v2.1 now used in SOA code]]
|H. Pye, Caltech
 
|-valign="top"
|[[GEOS-Chem v8-02-04|v8-02-04]]
|Feb 2010
|[[EPA/NEI05 North American emissions|EPA/NEI2005 regional emissions inventory for North America]]
|P. Le Sager (formerly Harvard),<br>A. van Donkelaar (Dalhousie)
 
|-valign="top"align="center"
|[[GEOS-Chem v8-02-04|v8-02-04]]
|Feb 2010
|[[MEGAN biogenic emissions#MEGAN in GEOS-Chem v8-02-04 and later versions|MEGAN v2.1 biogenic emissions]]
|Mike Barkley, Edinburgh
 
|-valign="top"
|[[GEOS-Chem v8-02-03|v8-02-03]]
|Oct 2009
|[[Ship emissions#ICOADS|ICOADS ship emissions]]
|Chulkyu Lee, Dalhousie
 
|-valign="top"
|[[GEOS-Chem v8-02-03|v8-02-03]]
|Oct 2009
|[[Lightning NOx emissions#Updated OTD.2FLIS local redistribution for GEOS-5|Updated OTD/LIS redistribution factors for GEOS-5]]
|Lee Murray, Harvard
 
 
|}
 
Please see the following documentation for information on previous model versions:
 
* [http://acmg.seas.harvard.edu/geos/word_pdf_docs/emissions_v8_02_03.pdf Description of anthropogenic emissions inventories in GEOS-Chem v8-02-03]
* [http://wiki.seas.harvard.edu/geos-chem/images/Anth_emiss_gc_v8-01-04.pdf Description of anthropogenic emissions inventories in GEOS-Chem v8-01-04]
* [http://acmg.seas.harvard.edu/geos/word_pdf_docs/INVENTORY_GC_public-pre_v8.pdf Table of available anthropogenic emissions inventories for use w/ GEOS-Chem (pre-v8)]
 
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).
 
However, at present, 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 CO<span><sub>2</sub> 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.
 
 
 
[[Image:Example.jpg]]
 
 
-- Ray Nassar 16:22, 10 May 2011 (EDT)
 
== MAP_A2A regridding algorithm ==
 
''NOTE: This update is currently slated for inclusion in [[GEOS-Chem v9-01-03]] or later.''
 
'''[mailto:COOPERM2@dal.ca Matt Cooper]''' has replaced the existing GEOS-Chem regridding routines with an algorithm adapted from the MAP_A2A regridding package (developed by S.-J. Lin and refined by Bob Yantosca). The previous regridding routines sometimes involved two separate regridding processes, passing through the [http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#A2.5 GEOS 1&deg; x 1&deg; grid], which  could lead to loss of information. The new algorithm regrids emissions from any arbitrary horizontal grid to the current model resolution.
 
The new regridding algorithm includes a reworking of MAP_A2A, provided by Prasad Kasibhatla.
 
'''''[mailto:psk9@duke.edu Prasad Kasibhatla] wrote:'''''
 
:I discovered that the MAP_A2A gridding algorithm was smearing emissions incorrectly (though not in a major way) -  seems to arise from mapping based on some sort of piecewise polynomial interpolation between grids, rather than simply using area-overlap fractions to apportion grid-average fluxes from old to new grid.
 
:I put in a pretty simple fix, that you should be able to implement pretty easily. I basically modified the Xmap and Ymap routines and got rid of all the other subroutine calls - the calling sequence is the same so I suspect it should be pretty easy for you to modify MAP_A2A.
 
:A couple of words of caution:
 
:*my fix only works for regular lat-lon grids because it uses delta(longitude) and delta(sin(latitude)) to do the regridding
:*my fix is exact for cases where you are regridding grid-average quantities (eg gridded emission fields), but I would do it differenty if I was regridding quantities that implicitly had sub-grid variation (eg if one assumes that a variable represents the center of a grid box and that there is a linear variation from one grid box center to another
:*You might also be interested in how I set it up so it handles nested grids correctly. I created new functions called GET_IIIPAR and GET_JJJPAR (see attached grid_mod.F) that I use in regridding on a global grid, and then use GET_XOFFSET and GET_YOFFSET to cut out the nested grid portion.
 
--[[User:Melissa Payer|Melissa Payer]] 13:18, 16 March 2012 (EDT)

Latest revision as of 18:26, 25 May 2018

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