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IPCC 4th Assessment Report (2007): Model NCAR-PCM, change fields

Agency	National Center for Atmospheric Research (NCAR), NSF (a primary sponsor), DOE (a primary sponsor), NASA, and NOAA
Model name	Parallel Climate Model (PCM)
Atmospheric prognostic variables	Vorticity Divergence Temperature Specific humidity Surface pressure Grid box averaged liquid condensate amount Grid box averaged ice condensate amount
Oceanic prognostic variables	grid-oriented zonal and meridional velocity components vertical velocity pressure density potential temperature salinity ideal age
Atmospheric resolution	T42, L26
Oceanic resolution	320x384 horizontal grid points, L40

Anomalies

For the SRES scenarios, SRA1B, SRA2, SRB1, anomalies are calculated relative to the 1961-1990 mean of the 20th century simulation, 20C3M. Anomalies for the 1PTO2X and 1PTO4X scenarios are relative to the pre-industrial control, PICTL.
Further details from the pcmdi model documentation page

Land sea mask: netcdf

Data Tables

Each block in the table contains links to one or more data files and to one information page (the `info' link) with further information.

The data files are 'tar' files with names of the form [model]_[scenario]_[variable]_[climatology].tar.

The model, scenario and variable are determined by the position in the table.

Each tar file contains several NetCDF files with names of the form: [model]_[scenario]_[ensemble number]_[variable]_[start-year]-[end-year].nc.

Different climatologies are indicated by the links within each table entry.

• 20x: Twenty year averages, +20-39, +46-85, +80-99, +180-199 (as used in Chapt. 10 of IPCC 2007)
• 30a: Thirty year averages, +01-30, +31-60, +61-90 (as used in the observational climatologies)
• 30b: Thirty year averages, +10-39, +40-69, +70-99 (for compatibility with the 3rd Assessment Report)

The averaging period is relative to AD2000 for SRES scenarios A1B, A2 and B1, relative to AD1900 for the twentieth century run (20C3M) and relative to the start of the experiment for the pre-industrial control (PICTL) and the 1PCTO2X and 1PCTO4X runs.

Data available

	Scenario
Variable	1PTO2X	SRA1B	SRA2	1PTO4X
precipitation flux (Anomaly)	20x; 30a; 30b; info	20x; 30b; info	20x; 30b; info	--
air pressure at sea level (Anomaly)	20x; 30a; 30b; info	20x; 30b; info	20x; 30b; info	20x; 30a; 30b; info
net upward shortwave flux in air (Anomaly)	20x; 30a; 30b; info	20x; 30b; info	20x; 30b; info	20x; 30a; 30b; info
air temperature (Anomaly)	20x; 30a; 30b; info	20x; 30b; info	20x; 30b; info	20x; 30a; 30b; info

Location: DDC Home > Models: Summary Data > AR4 (2007): SRES scenarios

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