This directory contains monthly averages of select fields from GODAS analyses.
The internal time stamp indicates the last day of the averaging period.

Please check the horizontal grid and vertical levels used for each field.
The horizontal grid for the u- and v- velocity components is offset from
the grid for the other fields.  Additionally, the vertical grid for the
vertical velocity is offset from the other subsurface fields.

Information on grib data from NCEP is available in Office Note 388:
   http://www.nco.ncep.noaa.gov/pmb/docs/on388/


As of February 6, 2006 the subdirectories, "monthly" and "pentad", contain
corrected GODAS analyses.  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.


Beginning with 2006 fields, computation of the depth of the bottom of
the isothermal layer and depth of the bottom of the mixed layer was
modifed to mask out ambiguous regions.  These are essentially at high
latitudes where there may be inversions or ice cover.  The modification
was implemented on 09 March 2006.  Any preexisting 2006 fields were
overwritten.

#----

On rerun and replacement of GODAS monthly data for August 2018 to May 2019

For years, WMO has worked for transition data format from use of alphnumeric code forms (TESAC) to BUFR in GTS.
In the efforts, Argo data in the NCEP tank also has been changed to BUFR format since July 2018. Accorng to this data format change of Argo, GODAS data decoder was updated, following the change. It has been known that there were issues in the updated decoder in GODAS, and occures warm bias in upper layer of GODAS (e.g. 0-110 m depth), which is due to the incorrect conversion. From reruns of updated codes, following data are replaced

godas.M.201808.grb
godas.M.201809.grb
godas.M.201810.grb
godas.M.201811.grb
godas.M.201812.grb
godas.M.201901.grb
godas.M.201902.grb
godas.M.201903.grb
godas.M.201904.grb
godas.M.201905.grb


April 30th 2019



<<<<<<
In this transient period, the listed data are overwritten from experimental runs,
and which is not the GODAS production run. If you want the data 
from the GODAS producrion run, let me know.
<<<<<<





Questions?   Contact Hyun-Chul.Lee@noaa.gov or David.Behringer@noaa.gov