Forcing data

Combined volcanic and solar forcing data series

Greenhouse gas concentrations for the 1860-2000 Simulation

Greenhouse gas concentrations for the 2000-2100 IPCC scenarios

Sulfate aerosol forcing concentration : Olivier Boucher

Land-use fields

Stabilisation A1b-450 ppm scenario

Land-use fields:

Land-use data based on a combination of the crop dataset of Ramankutty and Foley (1999), and pasture from the HYDE dataset (Goldewijk, 2001) have been produced by Nathalie de Noblet (IPSL/LSCE) to give a fraction of grid-cell covered by crop and pasture on a 0.5x0.5° global grid for each from 1700 to 1992.

The recommended methodology is that each model keeps its vegetation map as used in stream 1 simulations, and change only the crop and pasture fraction as provided in this dataset. Nathalie has a number of python scripts that could be used to interpolate the vegetation maps to replace current crop and pasture areas for the preindustrial and has offered to help the interested modelling groups (contact her at: Nathalie.de-noblet@cea.fr).

- The methodology for deriving the annual land-use fields for crop and pasture is described in the report:

" Designing historical and future land-cover maps at the global scale for climate studies", by Nathalie de Noblet-Ducoudré and Jean-Yves
Peterschmitt (pdf file )

- the land-use maps for cropland and pasture fractions are available as NetCDF files at 0.5° resolution from Nathalie de Noblet's
DODS server:
http://dods.extra.cea.fr/data/p25nath/DIVA/ForcingData/Vegetation/ over the period 1700-1992 (historical data)
http://dods.extra.cea.fr/data/p25nath/DIVA/ForcingData/Vegetation/crops_1700TO1992_0.5d.nc
http://dods.extra.cea.fr/data/p25nath/DIVA/ForcingData/Vegetation/pasture_1700TO1992_0.5d.nc and over the period 1993-2100 for scenario A1B:
http://dods.extra.cea.fr/data/p25nath/DIVA/ForcingData/Vegetation/crops_1993TO2100_0.5d_A1b.nc
http://dods.extra.cea.fr/data/p25nath/DIVA/ForcingData/Vegetation/pasture_1993TO2100_0.5d_A1b.nc

The dataset still needs some more extensive checking. In case you notice any problem please contact Nathalie de Noblet (nathalie.de-noblet@lsce.ipsl.fr) and Aurore Voldoire (aurore.voldoire@meteo.fr) .

New forcing fields for stream two multi-decennal simulations

Stabilisation A1b-450 ppm scenario:

Data provided by Detlef van Vuuren on 12-2007 :
all forcing data excel file : A1450.xls
(The equivalent CFC11 concentration has not been calculated yet, it will be provided in january 2008).

Hamonisation method (.doc):harmonisation.doc

Text files containing global/regional emission/concentration (GHG, air pollutants,halogenated gases) :
List of files : legend.txt
Zip text files : A1b_450.zip

Gridded emissions on a 0.5° x 0.5° grid for GHG and air pollutants.
maps_450.zip

Ozone fields:

The ozone fields for the stream 2 simulations for years 1850, 1900, 1950, 1980, 2000, and 2100 for scenarios A1, A2 and B1, are available as monthly mean NetCDF files on a server at UiO: http://folk.uio.no/bjoergr/ensembles
(for more information on the dataset contact Bjørg Rognerud bjorg.rognerud@geo.uio.no )