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We conduct and analyze a suite of simulations for the calendar year 2018 with the 2-way coupled WRF-CMAQ modeling system on a northern hemisphere domain to assess the impacts of fire emissions on the chemical and dynamical characteristics of the troposphere, through comparisons with observations from surface, aloft and remote sensing platforms. Substantial enhancements in surface-level and boundary-layer O3 and PM2.5 are noted due to fire emissions, incorporation of which generally help reduce model error and bias relative to available observations. Tropospheric PM2.5 was enhanced significantly in many regions and seasons as evidenced by widespread increase in aerosol optical depth due to fire emission. Consistent reductions in surface shortwave radiation from scattering and absorption due to aerosols that scale with tropospheric aerosol burden is noted for all seasons. The treatment of the volatility of organic carbon emitted by fires can influence estimated distributions and magnitude of organic aerosols indicating the need for further improvements in representation of these emissions.

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Large-Scale Impacts of Fire Emissions on Chemical, Optical and Radiative Characteristics of the Troposphere Across the Northern Hemisphere: A Modeling Analysis

  • 会议论文

  • 发表日期：

    2026年

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  • Rohit Mathur,
  • Fahim Sidi,
  • Christian Hogrefe,
  • David Wong,
  • Golam Sarwar,
  • Daiwen Kang,
  • Benjamin Murphy

摘要

We conduct and analyze a suite of simulations for the calendar year 2018 with the 2-way coupled WRF-CMAQ modeling system on a northern hemisphere domain to assess the impacts of fire emissions on the chemical and dynamical characteristics of the troposphere, through comparisons with observations from surface, aloft and remote sensing platforms. Substantial enhancements in surface-level and boundary-layer O3 and PM2.5 are noted due to fire emissions, incorporation of which generally help reduce model error and bias relative to available observations. Tropospheric PM2.5 was enhanced significantly in many regions and seasons as evidenced by widespread increase in aerosol optical depth due to fire emission. Consistent reductions in surface shortwave radiation from scattering and absorption due to aerosols that scale with tropospheric aerosol burden is noted for all seasons. The treatment of the volatility of organic carbon emitted by fires can influence estimated distributions and magnitude of organic aerosols indicating the need for further improvements in representation of these emissions.