NCEP Global Ocean Data Analysis System (GODAS) by year-month

Up-to-Date GODAS: The creation of netCDF (below) was not meant to be operational. A better link (created by NOAA/OAR/ESRL/PSD) is

  • http://www.cdc.noaa.gov/data/gridded/data.godas.html

This is 'operational' and is up-to-date.

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The following is outdated. The data are still available but not updated. =======================================================================

SOURCE: NCEP Global Ocean Data Assimilation System

DATA DESCRIPTION: Time series of monthly averages by variable derived from GODAS operational datasets

NOTE: "Corrected" GODAS analyses were made available on February 6, 2006.
The files below are derived from the corrected analyses. The GODAS WWW states:

  • The correction involves analyses only through the end of 1989. Nevertheless, the new analyses were extended through 2004 and the post-1990 analyses will show small differences with the earlier version due to small changes to the assimilation data set.

AVAILABILITY: All data are available from the NCAR Mass Storage System (MSS).

FORMAT: netCDF

The netCDF version was produced by the Climate Analysis Section as a community service.
The contents conform to the netCDF Climate and Forecast (CF) Metadata Convention .
The purpose is to facilitate evaluation of the CCSM and to produce datasets that may be more readily
analyzed by commonly available software tools.

Each file was converted from the original GRIB format to netCDF using NCL (NCAR Command Language).
The netCDF operators were used to extract each variable and create a time series.

GRID: Rectangular Grid (unequally spaced)

TIMES: Monthly Means

DATES: January 1980 - December 2005

LEVELS: 40 levels (m): 5, 15, 25, 35, 45, 55, 65, 75, 85, 95, 105, 115, 125, 135, 145, 155, 165, 175, 185, 195, 205, 215, 225, 238, 262, 303, 366, 459, 584, 747, 949,1193, 1479,1807,2174, 2579,3016,3483,3972,4478

FIELDS:

Description Name Units # levels
Total downward heat flux at surface THFLX W m-2 1
Salt flux SLTFL g sm-2 s-1 1
Sea surface height relative to geoid SSHG m 1
Geometric Depth Below Sea Surface DBSS_OBIL m

1; level indicator=238

Geometric Depth Below Sea Surface DBSS_OBML m 1; level indicator=237
Momentum flux, u component U_FLX N m-2 1
Momentum flux, v compoenent V_FLX N m-2 1
Salinity SALTY kg kg-1 40
U-component of current UOGRD m s-1 40
V-component of current VOGRD m s-1 40
Geometric vertical velocity DZDT m s-1 40
Potential temperature POT K 40

Note: Potential temperature is defined as the temperature of a parcel of water at the sea surface after it has been raised adiabatically from some depth in the ocean.

MSS PATH: /CA/GODAS/

MSS FILE NAMES: The MSS file names are similar to the source GRIB files names at http://cfs.ncep.noaa.gov/cfs/godas/monthly/

Generic Name: godas.M.yyyymm.SHORT.nc where yyyymm is the 6-digit year-month. The SHORT indicates that the variables have been stored as type "short" [ie, 16 bit integers] to reduce the dataset size. For example: godas.M.198507.SHORT.nc would be the file containing the monthly means for all the above variables for July 1985.

MSS FILE SIZE: Each file is 62.3MB.

REFERENCES: See bottom of http://www.cpc.ncep.noaa.gov/products/GODAS/background.shtml