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We implemented an updated version of the Regional Atmospheric Chemistry Mechanism (RACM2s21) in the Comprehensive Air quality Model with extensions (CAMx) and compared it with Carbon Bond version 6 (CB6) to examine wintertime ozone prediction sensitivity to photochemical mechanism. A multi-day high ozone episode (exceeding 100 ppb) during February 2013 in the Uintah basin (UB) of Utah served as the case study. We assessed mechanism impacts on CAMx predictions of ozone along with precusors and products (e.g., nitrogen oxides, hydrocarbon and carbonyl groups). Chemical Process Analysis (CPA) provided insights to explain ozone sensitivity to different mechanisms.

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Comparing the Chemical Mechanisms CB6r5 and RACM2s21 for a Winter Ozone Episode in Utah

  • 会议论文

  • 发表日期：

    2025年

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  • Chris Emery,
  • Huy Tran,
  • Trang Tran,
  • Seth Lyman,
  • Greg Yarwood

摘要

We implemented an updated version of the Regional Atmospheric Chemistry Mechanism (RACM2s21) in the Comprehensive Air quality Model with extensions (CAMx) and compared it with Carbon Bond version 6 (CB6) to examine wintertime ozone prediction sensitivity to photochemical mechanism. A multi-day high ozone episode (exceeding 100 ppb) during February 2013 in the Uintah basin (UB) of Utah served as the case study. We assessed mechanism impacts on CAMx predictions of ozone along with precusors and products (e.g., nitrogen oxides, hydrocarbon and carbonyl groups). Chemical Process Analysis (CPA) provided insights to explain ozone sensitivity to different mechanisms.