AMIP with Climatological Radiative Forcing

Description: AMIP conditions with GHGs and ozone set to climatological conditions. GHGs denotes CO2, CH4, O3, and CFCs. No anthropogenic aerosol variability, nor time varying volcanic or solar forcing.

Experiment ID: amip_clim_rf

Years: 1979-2012

Forcings

Sea Surface Temperature (SST) Observed values from dataset described here:

Hurrell, James W., James J. Hack, Dennis Shea, Julie M. Caron, James Rosinski, 2008: A New Sea Surface Temperature and Sea Ice Boundary Dataset for the Community Atmosphere Model. J. Climate, 21, 5145–5153. doi: 0.1175/2008JCLI2292.1
Sea Ice (SIC) Values from dataset described here:

Hurrell, James W., James J. Hack, Dennis Shea, Julie M. Caron, James Rosinski, 2008: A New Sea Surface Temperature and Sea Ice Boundary Dataset for the Community Atmosphere Model. J. Climate, 21, 5145–5153. doi: 0.1175/2008JCLI2292.1
Greenhouse Gases (GHG)
GHG Molecule Value Reference Year
CO2365 ppm1998
CH41.65 ppm1986
N2O3.06 ppb1986
CFC-112.80 ppt1996*
CFC-124.84 ppt1991
*highest value in record 2.69 in 1995-1996

Ozone (03) Climatology (1980-1991) described here:

http://www.knmi.nl/research/climate_observations/publications/1998/f+k/

Aerosols ECHAM5 uses a built-in, time independent aerosol model which is based on atmosphere layers, and land and water surface types, described here:

Tanre, D., Geleyn, J.-F. and Slingo, J. M. (1984): First results of the introduction of an advanced aerosol-radiation interaction in the ecmwf low resolution global model. In: Aerosols and Their Climatic Effects, edited by Gerber, H. and Deepak, A., pp. 133–177. A. Deepak, Hampton, Va.

CAM4 uses time-varying aerosol content, and volcano aerosols from 1979-2005. After 2005, RCP6 aerosols (with no volcanoes) are used.