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Abstract <p>The ChAP (Chemical and Aerosol Processes) scheme of the atmospheric sulfur cycle for Earth system models of intermediate complexity is extended by taking into account dimethylsulfide (DMS) emissions into the atmosphere and the influence of the precipitation type on the intensity of sulfate washout from the atmosphere. In addition, the numerical scheme of impurity transport is revised. To keep the proposed new model version ChAP 1.1 computationally efficient, the stationarity approximation with the prescribed vertical profiles for concentrations of sulfur compounds in the atmosphere was used (as in the previous version ChAP 1.0), which is related to relatively short lifetimes of sulfur dioxide and sulfates in the troposphere. As a result, the agreement between the spatial distribution of sulfur dioxide and sulfates and Copernicus Atmosphere Monitoring Service (CAMS) reanalysis data, Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP), from the late 20th from the late 20th to the early 21st centuries is improved. According to calculations with the new ChAP 1.1 version, the global sulfur dioxide content in the atmosphere in the 1990s–2000s is 0.2 TgS; the content of sulfates is 0.6–0.7 TgS with the corresponding lifetimes of 1 day and 6 days, respectively.</p>

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An Improved Version of the Atmospheric Sulfur Cycle Scheme for Earth System Models of Intermediate Complexity

  • 期刊论文

  • 发表日期：

    2025年8月14日

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  • A. O. Nyrov,
  • A. V. Eliseev,
  • I. I. Mokhov

摘要

Abstract

The ChAP (Chemical and Aerosol Processes) scheme of the atmospheric sulfur cycle for Earth system models of intermediate complexity is extended by taking into account dimethylsulfide (DMS) emissions into the atmosphere and the influence of the precipitation type on the intensity of sulfate washout from the atmosphere. In addition, the numerical scheme of impurity transport is revised. To keep the proposed new model version ChAP 1.1 computationally efficient, the stationarity approximation with the prescribed vertical profiles for concentrations of sulfur compounds in the atmosphere was used (as in the previous version ChAP 1.0), which is related to relatively short lifetimes of sulfur dioxide and sulfates in the troposphere. As a result, the agreement between the spatial distribution of sulfur dioxide and sulfates and Copernicus Atmosphere Monitoring Service (CAMS) reanalysis data, Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP), from the late 20th from the late 20th to the early 21st centuries is improved. According to calculations with the new ChAP 1.1 version, the global sulfur dioxide content in the atmosphere in the 1990s–2000s is 0.2 TgS; the content of sulfates is 0.6–0.7 TgS with the corresponding lifetimes of 1 day and 6 days, respectively.