A new Geoengineering Model Intercomparison Project (GeoMIP) experiment designed for climate and chemistry models

A new Geoengineering Model Intercomparison Project (GeoMIP) experiment "G4 specified stratospheric aerosols" (short name: G4SSA) is proposed to investigate the impact of stratospheric aerosol geoengineering on atmosphere, chemistry, dynamics, climate, and the environment. In contrast to the earlier G4 GeoMIP experiment, which requires an emission of sulfur dioxide (SO₂) into the model, a prescribed aerosol forcing file is provided to the community, to be consistently applied to future model experiments between 2020 and 2100. This stratospheric aerosol distribution, with a total burden of about 2 Tg S has been derived using the ECHAM5-HAM microphysical model, based on a continuous annual tropical emission of 8 Tg SO₂ yr⁻¹. A ramp-up of geoengineering in 2020 and a ramp-down in 2070 over a period of 2 years are included in the distribution, while a background aerosol burden should be used for the last 3 decades of the experiment. The performance of this experiment using climate and chemistry models in a multi-model comparison framework will allow us to better understand the impact of geoengineering and its abrupt termination after 50 years in a changing environment. The zonal and monthly mean stratospheric aerosol input data set is available at https://www2.acd.ucar.edu/gcm/geomip-g4-specified-stratospheric-aerosol-data-set.

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Copyright Author(s) 2014. This work is distributed under the Creative Commons Attribution 3.0 License5
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Author Tilmes, Simone
Mills, Michael
Niemeier, U.
Schmidt, H.
Robock, A.
Kravitz, B.
Lamarque, Jean-Francois
Pitari, G.
English, J.
Publisher UCAR/NCAR - Library
Publication Date 2015-01-15T00:00:00
Digital Object Identifier (DOI) Not Assigned
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Topic Category geoscientificInformation
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Metadata Date 2023-08-18T19:06:18.808282
Metadata Record Identifier edu.ucar.opensky::articles:16495
Metadata Language eng; USA
Suggested Citation Tilmes, Simone, Mills, Michael, Niemeier, U., Schmidt, H., Robock, A., Kravitz, B., Lamarque, Jean-Francois, Pitari, G., English, J.. (2015). A new Geoengineering Model Intercomparison Project (GeoMIP) experiment designed for climate and chemistry models. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d77w6db0. Accessed 18 January 2025.

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