A06: Emissions-MIP project

Sensitivity to SO₂ emissions height: How does E3SM compare to other models?

• @Hailong Wang

• hailong.wang@pnnl.gov

Hamza Ahsan, Mingxuan Wu, Steven Smith

Atmosphere

Emissions-MIP (ecosystem project)

Anthropogenic emissions of aerosols and precursor compounds are known to significantly affect the energy balance of the Earth-atmosphere system, alter the formation of clouds and precipitation, and have substantial impact on human health and the environment. The Emissions Model Intercomparison (Emissions-MIP) project has examined the sensitivity to a set of emission perturbations of 11 climate and chemistry models, including the atmospheric component of E3SMv1 (Ahsan et al. 2023, EGUsphere). The assumed height of SO₂ injection has the largest overall impacts, particularly on global mean net radiative flux (maximum difference of -0.35 W m^-2), SO₂ lifetime over northern hemisphere land (maximum difference of 0.8 days), surface SO₂ concentration (up to a 59% decrease), and near-surface sulfate concentration (up to a 23% increase). The results imply a need to assure that anthropogenic emission injection height is accurately and consistently represented in global models. There is a wide range of sensitivities, and this presentation will highlight the E3SMv1 results in comparison to other models.

Reference:

Ahsan, H., Wang, H., Wu, J., Wu, M., Smith, S. J., Bauer, S., Suchyta, H., Olivié, D., Myhre, G., Matsui, H., Bian, H., Lamarque, J.-F., Carslaw, K., Horowitz, L., Regayre, L., Chin, M., Schulz, M., Skeie, R. B., Takemura, T., and Naik, V.: The Emissions Model Intercomparison Project (Emissions-MIP): quantifying model sensitivity to emission characteristics, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2023-604, 2023.

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