ECHAM4_OPYC_T42_22670_Scenario

Bengtsson, Lennart

Experiment
Summary
Greenhouse gas experiment (GHG)
In GHG, the concentrations of the following greenhouse gases are prescribed as a function of time: CO2, CH4, N2O and several industrial gases, i.e., chlorofluorocarbons (CFC-11, 12, 113, 114, 115), hydrochlorofluorocarbons (HCFC-22, 123, 141b), hydrofluorocarbons (HFC-125, 134a, 152a), carbon tetrachloride (CCl4) and methylchloroform (CH3CCl3).
From 1860 to 1990, the annual concentrations of these gases are prescribed as observed and, from 1990 onward, according to the IPCC'92 scenario IS92a. For the industrial gases, the IS92a scenario has been updated to be consistent with a Copenhagen-like emission scenario (IPCC'96). All of the time dependent, or 'transient', forcing experiments have been initialized at year 100 of CTL, nominally 1860 in the transient experiments. However, these initial values do not correspond to 'pre-industrial' (1860) but to present-day conditions.
This applies not only to SST and other climate variables but also to the concentrations of CO2, CH4 and N2O. In the transient experiments, this initial shift in concentration is taken into account by enhancing the observed/projected concentrations of these gases in an appropriate way (Appendix A). Although this approach allows for a correct computation of the radiative forcing, it does not account for the warm bias in the initial climate state. This bias is maintained throughout the transient experiments so that a comparison with observations should be restricted to climate trends as a result of the imposed radiative forcings.
Corresponding Control Run is ECHAM4_OPYC_T42_71413_CTRL.
Project
IPCC_SAR_ECHAM4/OPYC (IPCC Second Assessment Report ECHAM4/OPYC data sets)
Location(s)
World (general)
Data Catalog
World Data Center for Climate
Size
11.97 GiB (12852311040 Byte)
Format
GRIB1
Status
completely archived
Creation Date
Future Review Date
2031-09-23
Cite as
Bengtsson, Lennart (2001). ECHAM4_OPYC_T42_22670_Scenario. World Data Center for Climate (WDCC) at DKRZ. https://hdl.handle.net/21.14106/81763130851eedcccb716795a6388a61592b9e33

BibTeX RIS
Description
Model run
Attention:
Variables representing an average value for the output intervall
have erroneuos data in records No. 2517 and 2775
Contact typePersonORCIDOrganization
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Attached Datasets ( 269 )

Details for selected entry
[Entry acronym: EH4OPYC_22670GHG_MM] [Entry id: 20072]