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IPCC 4th Assessment Report (2007): Model NASA-GISS-AOM, change fields

Agency	NASA Goddard Institute for Space Studies (NASA/GISS), USA
Model name	AOM 4x3
Atmospheric prognostic variables	mass (kg/m^2); eastward velocity (m/s) on C-grid;
Oceanic prognostic variables	mass (kg/m^2); eastward velocity (m/s) on C-grid; northward velocity (m/s) on C-grid;
Atmospheric resolution	4 degrees longitude, 3 degrees latitude, 12L
Oceanic resolution	4 degrees longitude, 3 degrees latitude, up to 16L

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	SRA1B	SRB1
specific humidity (Anomaly)	20x; 30b; info	20x; 30b; info
precipitation flux (Anomaly)	20x; 30b; info	20x; 30b; info
air pressure at sea level (Anomaly)	20x; 30b; info	20x; 30b; info
net upward shortwave flux in air (Anomaly)	20x; 30b; info	20x; 30b; info
air temperature (Anomaly)	20x; 30b; info	20x; 30b; info
air temperature daily max (Anomaly)	20x; 30b; info	20x; 30b; info
air temperature daily min (Anomaly)	20x; 30b; info	20x; 30b; info
eastward wind (Anomaly)	20x; 30b; info	20x; 30b; info
northward wind (Anomaly)	20x; 30b; info	20x; 30b; info

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