A new paper by Simone Tilmes et al. has just been published. It is open
access:
Tilmes, S., Mills, M. J., Niemeier, U., Schmidt, H., Robock, A.,
Kravitz, B., Lamarque, J.-F., Pitari, G., and English, J. M.: A new
Geoengineering Model Intercomparison Project (GeoMIP) experiment
designed for climate and chemistry models, /Geosci. Model Dev./, /8/,
43-49, doi:10.5194/gmd-8-43-2015, 2015.
http://www.geosci-model-dev.net/8/43/2015/gmd-8-43-2015.html
*Abstract.* 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.
--
Alan Robock
Alan Robock, Distinguished Professor
Editor, Reviews of Geophysics
Director, Meteorology Undergraduate Program
Department of Environmental Sciences Phone: +1-848-932-5751
Rutgers University Fax: +1-732-932-8644
14 College Farm Road E-mail: [email protected]
New Brunswick, NJ 08901-8551 USA http://envsci.rutgers.edu/~robock
http://twitter.com/AlanRobock
Watch my 18 min TEDx talk at http://www.youtube.com/watch?v=qsrEk1oZ-54
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