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 model consists of the atmospheric component which based

on the weather forecast model of ECMWF. The atmosphere component

is the standard model version of a 19-level hybrid sigma-pressure

coordinate system.

The ocean component is a model which computes with

isopycnal coordinates.

ECHAM4/OPYC3(https://www.ipcc-data.org/gcm/models/tar/echam4opyc3.html).

This data set is an enlargement of the IPCC data set and provides

additionel meteorological parameters.

The run produces monthly averaged values of the variabeles.

Changes of anthropogenic emissions of CO2, CH4, N2O and sulphur

dioxide are prescribed according to the above mentioned scenario.

The model run starts in 1990 from the results of the scenario run

GSDIO (Experiment "EH4OPYC_22723GSDIO") which has been run with

observed conditions for the time period 1860-1990.