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 th...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-01-01
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| Series: | Geoscientific Model Development |
| Online Access: | http://www.geosci-model-dev.net/8/43/2015/gmd-8-43-2015.pdf |
| Summary: | 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
(SO<sub>2</sub>) 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 SO<sub>2</sub> yr<sup>−1</sup>. 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
<a href="https://www2.acd.ucar.edu/gcm/geomip-g4-specified-stratospheric-aerosol-data-set">https://www2.acd.ucar.edu/gcm/geomip-g4-specified-stratospheric-aerosol-data-set</a>. |
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| ISSN: | 1991-959X 1991-9603 |