Difference between revisions of "MEGAN biogenic emissions"

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This page describes the implementations of the MEGAN (Model of Emissions of Gases and Aerosols from Nature) biogenic emissions in GEOS-Chem.
 
This page describes the implementations of the MEGAN (Model of Emissions of Gases and Aerosols from Nature) biogenic emissions in GEOS-Chem.
  
== Overview ==
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== MEGAN 3.0 ==
  
GEOS-Chem has used three versions of the MEGAN biogenic emissions. These are now all described on separate wiki pages.
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An implementation of MEGAN 3.0 is currently a [https://github.com/geoschem/geos-chem/issues/1026 requested feature for GEOS-Chem development].
  
=== MEGAN v2.0 biogenic emissions ===
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== MEGAN v2.1 plus Guenther 2012 biogenic emissions ==
  
The [[MEGAN v2.0 biogenic emissions]] are now obsoleteThey were used in [[GEOS-Chem v8-02-03]] and prior versions.
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GEOS-Chem currently uses the [[MEGAN v2.1 plus Guenther 2012 biogenic emissions|MEGAN 2.1 biogenic emissions with updates from Guenther (2012)]].  The emissions fed into GEOS-Chem by the [https://hemco.readthedocs.io Harmonized Emissions Component (HEMCO)] extension.
  
--[[User:Bmy|Bob Y.]] 15:32, 25 February 2015 (EST)
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--[[User:Bmy|Bob Yantosca]] ([[User talk:Bmy|talk]]) 21:10, 16 September 2022 (UTC)
 
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=== MEGAN v2.1 biogenic emissions ===
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The [[MEGAN v2.1 biogenic emissions]] were used in [[GEOS-Chem v8-02-04]] through [[GEOS-Chem v9-02]].  They were retired with the advent of the [[HEMCO emissions component]] in [[GEOS-Chem v10-01]].
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--[[User:Bmy|Bob Y.]] 15:32, 25 February 2015 (EST)
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=== MEGAN v2.1 plus Guenther 2012 biogenic emissions ===
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[[GEOS-Chem v10-01]] and newer versions now use the [[MEGAN v2.1 plus Guenther 2012 biogenic emissions|MEGAN 2.1 biogenic emissions with updates from Guenther (2012)]]; These are implemented throImplemented via the [[HEMCO|HEMCO emissions component]].
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--[[User:Bmy|Bob Y.]] 15:32, 25 February 2015 (EST)
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== Update to MEGAN2.1 (Guenther et al., 2012) ==
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<div style="color: #aa0000; background: #eeeeee;border: 3px solid red; padding: 1em; margin: auto; width: 90%; ">'''<p>NOTE: The MEGAN2.1 emissions have only been used in research versions of GEOS-Chem to date.  We are currently planning to include MEGAN2.1 emissions into [[GEOS-Chem v10-01]] via the [[HEMCO|HEMCO emissions component]].</p><p>&mdash; Bob Yantosca, 13 May 2014</p>'''</div>
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Please see [http://wiki.seas.harvard.edu/geos-chem/images/Readme_megan21.pdf this file] that describes an available update to MEGAN2.1 in GEOS-Chem. The update applies emission algorithm updates according to Guenther et al. (Geosci. Model Dev., 5, 1471–1492, 2012), enables computation of emissions for more compounds, uses CLM4 plant functional type distributions, facilitates computing emissions with different/dynamic land cover schemes, and streamlines the code.
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Please contact [mailto:dbm@umn.edu Dylan Millet] to obtain the code or with any questions.
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'''''Documentation:'''''
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*[http://wiki.seas.harvard.edu/geos-chem/images/Readme_megan21.pdf Readme]
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*<u>Comparison between previous and updated BVOC emissions for standard tracers (year-2006):</u>
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**[http://wiki.seas.harvard.edu/geos-chem/images/EmissComp_2006_2x25.pdf 2x2.5]
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**[http://wiki.seas.harvard.edu/geos-chem/images/EmissComp_2006_4x5.pdf 4x5]
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*<u>Comparison between previous and updated BVOC emissions for standard tracers (nested NA, year-2011):</u>
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**[http://wiki.seas.harvard.edu/geos-chem/images/EmissComp_2011_05x067_NA.pdf 0.5x0.67]
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*<u>Updated emissions for all BVOCs, including non-standard tracers:</u>
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**[http://wiki.seas.harvard.edu/geos-chem/images/EmissAll_2x25.pdf 2x25]
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*<u>Monthly CO comparison for previous and updated MEGAN implementation (year-2006; 4x5 resolution):</u>
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**[http://wiki.seas.harvard.edu/geos-chem/images/COComp_2006_4x5.pdf 4x5]
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--[[User:Dbm|Dbm]] 14:18, 22 January 2013 (EST)
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== CO2 direct effect on isoprene emissions ==
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''''' This update is slated for inclusion in [[GEOS-Chem v10-01]] or later '''''
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Amos Tai developed code updates to include CO2 inhibition of isoprene emissions in MEGAN.
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The reference for this work is:
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:Tai, A.P.K., L.J. Mickley, C.L. Heald, S. Wu, ''Effect of CO2 inhibition on biogenic isoprene emission: Implications for air quality under 2000-to-2050 changes in climate, vegetation, and land use'', <u>Geophys. Res. Let.</u>, '''40''', 3479-3483, 2013. [[http://acmg.seas.harvard.edu/publications/2013/Tai_grl_2013.pdf pdf]]
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--[[User:Melissa Payer|Melissa Sulprizio]] 15:45, 23 January 2014 (EST)
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== Unresolved issues ==
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None at this time.
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== References ==
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#Barkley, M., ''Description of MEGAN biogenic VOC emissions in GEOS-Chem'', 2010. [http://acmg.seas.harvard.edu/geos/wiki_docs/emissions/megan.pdf PDF]
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#Buermann, W., Wang, Y.J., Dong, J.R., Zhou, L.M., Zeng, X.B., Dickinson, R.E., Potter, C.S., and Myneni, R.B.: ''Analysis of a multiyear global vegetation leaf area index data set'', <u>J. Geophys. Res.</u>, 107, 4646, doi:10.1029/2001JD000975, 2002.
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#Guenther, A., Baugh, B., Brasseur, G., Greenberg, J., Harley, P., Klinger, L., Serca, D., and Vierling, L.: ''Isoprene emission estimates and uncertainties for the Central African EXPRESSO study domain'', <u>J. Geophys. Res.</u>, 104, 30625-30639, 1999.
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#Guenther, A., Karl, T., Harley, P., Wiedinmyer, C., Palmer, P.I., and Geron, C.: ''Estimates of global terrestrial isoprene emissions using MEGAN (Model of Emissions of Gases and Aerosols from Nature)'', <u>Atmos. Chem. Phys.</u>, '''6''', 3181-3210, 2006.
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#Guenther, A., and C. Wiedinmyer, ''User's guide to the Model of Emissions of Gases and Aerosols from Nature (MEGAN), Version 2.01'', 2007.
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#Guenther, A. B., Jiang, X., Heald, C. L., Sakulyanontvittaya, T., Duhl, T., Emmons, L. K., and Wang, X.: ''The Model of Emissions of Gases and Aerosols from Nature version 2.1 (MEGAN2.1): an extended and updated framework for modeling biogenic emissions'', <u>Geosci. Model Dev.</u>, '''5''', 1471-1492, doi:10.5194/gmd-5-1471-2012, 2012.
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#Millet, D.B., Jacob, D.J., Boersma, K.F., Fu, T.M., Kurosu, T.P., Chance, K., Heald, C.L., and Guenther, A.: ''Spatial distribution of isoprene emissions from North America derived from formaldehyde column measurements by the OMI satellite sensor'', <u>J. Geophys. Res.</u>, 113, D02307, doi:10.1029/2007JD008950, 2008. [http://acmg.seas.harvard.edu/publications/millet_2008.pdf PDF]
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#Mueller, J.-F., et al. ''Global isoprene emissions estimated using MEGAN, ECMWF analyses and a detailed canopy environment model'', <u>Atmos. Chem. Phys.</u>, '''8''', 1329-1341, 2008.
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#Myneni, R. B., et al., ''Large seasonal swings in leaf area of Amazon rainforests'', <u>Proceedings of the National Academy of Sciences</u>, '''104'''(12), 4820{4823, doi:10.1073/pnas.0611338104, 2007.
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#Palmer, P.I., Abbot, D.S., Fu, T.M., Jacob, D.J., Chance, K., Kurosu, T.P., Guenther, A., Wiedinmyer, C., Stanton, J.C., Pilling, M.J., Pressley, S.N., Lamb, B., and Sumner, A.L.: ''Quantifying the seasonal and interannual variability of North American isoprene emissions using satellite observations of the formaldehyde column'', <u>J. Geophys. Res.</u>, 111, D12315, doi:10.1029/2005JD006689, 2006. [http://acmg.seas.harvard.edu/publications/palmer2006_gome.pdf PDF]
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#Sakulyanontvittaya, T., T. Duhl, C. Wiedinmyer, D. Helmig, S. Matsunaga, M. Potosnak, J. Milford, and A. Guenther, ''Monoterpene and Sesquiterpene Emission Estimates for the United States'', <u>Environ. Sci. Technol.</u>, '''42'''(5), 1623{1629, doi:10.1021/es702274e, 2008.
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--[[User:Bmy|Bob Y.]] 09:39, 3 March 2010 (EST)
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Latest revision as of 21:11, 16 September 2022

This page describes the implementations of the MEGAN (Model of Emissions of Gases and Aerosols from Nature) biogenic emissions in GEOS-Chem.

MEGAN 3.0

An implementation of MEGAN 3.0 is currently a requested feature for GEOS-Chem development.

MEGAN v2.1 plus Guenther 2012 biogenic emissions

GEOS-Chem currently uses the MEGAN 2.1 biogenic emissions with updates from Guenther (2012). The emissions fed into GEOS-Chem by the Harmonized Emissions Component (HEMCO) extension.

--Bob Yantosca (talk) 21:10, 16 September 2022 (UTC)