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MEGAN Biogenic Emissions Modeling Activities. Alex Guenther Earth & Sun Systems Laboratory National Center for Atmospheric Research Boulder CO USA. Tasks for 2006. Improved landcover for specific regions (U.S., Canada, Mexico, southern Africa, Europe, China, Malaysia)

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MEGAN Biogenic Emissions Modeling Activities

Alex Guenther

Earth & Sun Systems Laboratory

National Center for Atmospheric Research

Boulder CO USA


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Tasks for 2006

  • Improved landcover for specific regions (U.S., Canada, Mexico, southern Africa, Europe, China, Malaysia)

  • VOC chemical speciation

  • Response of BVOC emissions to ozone and CO2 variations

  • Oxidized biogenic VOC and Secondary Organic Aerosol emissions

  • Seasonal and interannual BVOC emission variations

  • BVOC emissions from shrubs, grass and crops

  • Update Soil NO emissions


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Regional landcover and emission factors

Task: Incorporate existing regional landcover and emission factor data that have not been incorporated into MEGAN.

Expected result: This effort is primarily for high resolution regional modeling (including urban areas) but will also lead to improved estimates for low resolution global models

Status: Active effort. Western U.S. should be completed by summer 2006. Other regions will follow.


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VOC chemical speciation

Task: Include all significant biogenic trace gas emissions (>110 compounds)

Expected Result: This will be useful as chemistry models begin considered more chemical species- including different SOA yields

Status: Active project. Should be completed by summer 2006.


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BVOC emission response to ozone and CO2 variations

Task: Have BVOC emissions respond to changes in ozone and CO2

Expected Result: Capability for examining potential feedbacks and future trends

Status: Active project. Observational studies scheduled for summer 2006. May be completed by fall 2006.


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Oxidized biogenic VOC and Secondary Organic Aerosol Emissions

Task: Simulate hourly emissions of SOA and oxidized VOC that arise from oxidation of biogenic VOC in vegetation canopies

Expected Result: Can include this source of SOA and oxyVOC in models (it is currently not included)

Status: Active project. Should be completed by fall 2006.


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Seasonal and interannual BVOC emission variations Emissions

Task: Improve simulation of seasonal and interannual variations in BVOC emissions

Expected Result: Will improve future emission estimates. Will also help to identify sources (biogenic sources have different seasonal trends than anthropogenic)

Status: Active project. Observations during 2006 Should be completed by end of 2006.


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Improve BVOC emission estimates for shrubs, grass and crops Emissions

Task: Characterize BVOC emissions from shrublands, grasslands and croplands.

Expected Result: Will improve BVOC emission estimates for these regions

Status: Active project. Observations during 2006. Should be completed by end of 2006.


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Soil NO emissions Emissions

Task: MEGAN is currently using the Williams et al. 1992 approach. This should be updated at least using Yenger and Levy (1995) approach. More sophisticated models are being used in Europe and may also be considered.

Expected Result: Generally improved global and regional NO emissions

Status: Uncertain- hope to initiate this during 2006