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GCM Data File FormatThe files you download are gzipped tar archives, (programs such as Stuffit Expander and WinZip can open these archives). The archives for the 1960-91 period contain one file each. The mean and change archives that you download contain three files, one for each of the reference periods (2010-39, 2040-69 and 2070-99) The nomenclature used for the files is: AAAAA_BBb_varname_DDDD.mea
Therefore CCCma_B2a_DSWF_2020mea.tar.gz contains represents Mean temperature change for the period 2010-2039 under B2 scenario for the first integration Greenhouse Gas forcing scenario using CGCM1. GCM Grid Details - For the download files from the Green Pages
The format of the Scenario Download files is as follows. There is a six line header for each month, the codes for the header fields in italics (e.g. Model Name) are given below. The following is an example of the structure of the scenario data files.
IPCC-Data-Distribution-Centre-ModelName-Results---Date Grid-is-xxx-*-yyy----Month-is-Jan Mean-Change-values-for-year-year-with-respect-to-1961-1990 ForcingDetails---ExperimentCode Variable-Name-(Units) DataItems-----Format is 10f8.2---Missing-Value-is-9999.99
IPCC-Data-Distribution-Centre-ModelName-Results---Date Grid-is-xxx-*-yyy----Month-is-Feb Mean-Change-values-for-year-year-with-respect-to-1961-1990 ForcingDetails---ExperimentCode Variable-Name-(Units) Data Items-----Format is 10f8.2---Missing-Value-is-9999.99
IPCC-Data-Distribution-Centre-ModelName-Results---Date Grid-is-xxx-*-yyy----Month-is-Dec Mean-Change-values-for-year-year-with-respect-to-1961-1990 ForcingDetails---ExperimentCode Variable-Name-(Units) Data Items-----Format is 10f8.2---Missing-Value-is-9999.99 Codes for header Fields
Grid - Number of x Co-ordinates and Number of y Co-ordinates (e.g. 96 x 73) Month - Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec Year- Year - time slice data are for, e.g., 2010-2039 NOTE: For the period 1961-1990 the data are the actual values, for the 2010-2039, 2040-2069 and 2070-2099 the data are the changes with respect to the 1961-1990 period. Forcing Details - GG = Greenhouse Gas: GS = Greenhouse Gas and Sulphate Aerosols; A = 1% per annum (IS92a); D= 0.5% per annum (IS92d); 1, 2, 3 or 4 represents the ensemble member or X = Ensemble mean. Experiment Code -Refers to the first six characters of the file name (i.e., AACCD1) Data Items - The product of xxx*yyy (e.g. 7008) floating point values, starting with the most northerly row ordered from west to east.
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