The SRES data sets were published by the IPCC in 2000 and classified

into four different scenario families (A1, A2, B1, B2).

SRES_A2 storyline describes a very heterogeneous world

with the underlying theme of self-reliance and preservation

of local identities. It results in this scenario a continous

increasing population together with a slower economic growth

and technological change.

The Hadley Centre Circulation Model is a 3-dim AOGCM described

by (Gordon et al., 2000 and Pope et al., 2000).

The atmospheric component has a 19 levels horizontal resolution,

comparable with spectral resolution of T42, while the ocean

component has a 20 levels resolution.

HADCM3(http://www.metoffice.gov.uk/research/modelling-systems/unified-model/climate-models/hadcm3 )

The changes of anthropogenic emissions of CO2, CH4, N2O and

sulphur dioxide are prescribed according to the above

mentioned scenario.

These data belongs to a set of three ensemble runs, with the

HADCM3-model, using the SRES_A2 scenario. They provide monthly

averaged values of selected variables for the IPCC-DDC.

HadCM3_SRES_A2b and HadCM3_SRES_A2c follow the same experimental design

and historical plus future forcings as HadCM3_SRES_A2 (Johns et al.

2003) but starting from initial conditions taken respectively 100 years

and 200 years further into the HadCM3 control simulation.