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Adding the Model of Emissions of Gases and Aerosols from Nature (MEGAN) to the CMAQ Modeling System for inline biogenic emissions
Citation:
Willison, J., Jon Pleim, D. Wong, F. Binkowski, AND C. Hogrefe. Adding the Model of Emissions of Gases and Aerosols from Nature (MEGAN) to the CMAQ Modeling System for inline biogenic emissions. 20th CMAS Conference, Virtual, NC, November 01 - 05, 2021.
Impact/Purpose:
Virtual presentation at the 20th Annual CMAS conference.
Description:
Biogenic emissions of volatile organic compounds (BVOC) and nitric oxide can significantly contribute to surface concentrations of ozone and particulate matter. The current release of the Community Multiscale Air Quality (CMAQ) model offers the Biogenic Emission Inventory System (BEIS) as the only option for simulating inline biogenic emissions. This presentation will summarize the integration and performance of a second option, MEGAN v3.1, that will be included in CMAQ v6.0. We will present results from WRF-CMAQ simulations over the contiguous United States and from MPAS-CMAQ for a global domain. Comparisons with BEIS show that BVOC and nitric oxide production from MEGAN are strongly dependent on the configuration and runtime options. Enabling drought stress reduces BVOC production and PM2.5 concentration relative to BEIS, while improving the simulated organic carbon. Consistent with previous work, the Berkeley-Dalhousie Soil Nitric Oxide (NO) Parameterization simulates more NO and subsequently more ozone than the Yienger and Levy options that are available in both BEIS and MEGAN. The results from these sensitivity experiments will help CMAQ users improve the biogenic emissions configuration for their applications.
