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.
=======================================================================
The following is outdated. The data are still available but not updated.
=======================================================================
DESCRIPTION: Monthly averages of assorted variables derived from operational datasets.
SOURCE: NCEP Global Ocean Data Assimilation System
CAVEAT:
There is a warm bias in GODAS before the early 1990s.
The GODAS uses 1992 as a start date
for their climatology so 1992 onward may be best. Please read references.
AVAILABILITY:
All data are available from the NCAR Mass Storage System (MSS). NOT YET AVAILABLE
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).
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:
netCDF
Description Name units
-------------------------------------------------------------
Total downward heat flux at surface THFLX W/m2
Salt Flux SLTFL g/cm2/s
Sea Surface Height Relative to Geoid SSHG m
Geometric Depth Below Sea Surface DBSS_OBIL m level indicator=238
Geometric Depth Below Sea Surface DBSS_OBML m level indicator=237
Momentum flux, u component U_FLX N/m^2
Momentum flux, v component V_FLX N/m^2
Salinity SALTY kg/kg
u-component of current UOGRD m/s
v-component of current VOGRD m/s
Geometric vertical velocity DZDT m/s
Potential temperature POT K
MSS PATH:
/CAS/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
netCDF metadata:
Most of the meta data associated with each variable may be ignored.
It was created by NCL as part of the process of converting GRIB to netCDF.
netcdf godas.M.200507.SHORT {
dimensions:
time = UNLIMITED ; // (1 currently)
depth = 40 ;
tlat = 418 ;
tlon = 360 ;
DEPTH = 40 ; [slightly different levels than indicated above]
ulat = 418 ;
ulon = 360 ;
variables:
int depth(depth) ;
depth:positive = "down" ;
depth:units = "m" ;
depth:long_name = "depth below sea level" ;
float tlon(tlon) ;
tlon:La1 = -74.5f ;
tlon:Lo1 = 0.5f ;
tlon:La2 = 64.499f ;
tlon:Lo2 = 359.5f ;
tlon:Di = 1.f ;
tlon:Dj = 0.3333309f ;
tlon:units = "degrees_east" ;
tlon:GridType = "Cylindrical Equidistant Projection Grid" ;
tlon:long_name = "longitude" ;
float tlat(tlat) ;
tlat:La1 = -74.5f ;
tlat:Lo1 = 0.5f ;
tlat:La2 = 64.499f ;
tlat:Lo2 = 359.5f ;
tlat:Di = 1.f ;
tlat:Dj = 0.3333309f ;
tlat:units = "degrees_north" ;
tlat:GridType = "Cylindrical Equidistant Projection Grid" ;
tlat:long_name = "latitude" ;
int DEPTH(DEPTH) ;
DEPTH:positive = "down" ;
DEPTH:units = "m" ;
DEPTH:long_name = "depth below sea level" ;
float ulon(ulon) ;
ulon:La1 = -74.f ;
ulon:Lo1 = 1.f ;
ulon:La2 = 64.999f ;
ulon:Lo2 = 360.f ;
ulon:Di = 1.f ;
ulon:Dj = 0.3333309f ;
ulon:units = "degrees_east" ;
ulon:GridType = "Cylindrical Equidistant Projection Grid" ;
ulon:long_name = "longitude" ;
float ulat(ulat) ;
ulat:La1 = -74.f ;
ulat:Lo1 = 1.f ;
ulat:La2 = 64.999f ;
ulat:Lo2 = 360.f ;
ulat:Di = 1.f ;
ulat:Dj = 0.3333309f ;
ulat:units = "degrees_north" ;
ulat:GridType = "Cylindrical Equidistant Projection Grid" ;
ulat:long_name = "latitude" ;
double time(time) ;
time:units = "hours since 1901-01-01 00:00:0.0" ;
time:info = "This is the LAST day of the averaging period. Consistent with original GRIB." ;
time:long_name = "time" ;
int date(time) ;
date:units = "YYYYMM" ;
float timePlot(time) ;
timePlot:info = "good for plotting time series" ;
timePlot:units = "YYYY.(fractional part of year)" ;
short THFLX(time, tlat, tlon) ;
THFLX:_FillValue = 32767s ;
THFLX:sub_center = "Environmental Modeling Center" ;
THFLX:center = "US National Weather Service - NCEP (WMC)" ;
THFLX:long_name = "Total downward heat flux at surface (downward is positive)" ;
THFLX:units = "W/m2" ;
THFLX:level_indicator = 1 ;
THFLX:gds_grid_type = 0 ;
THFLX:parameter_table_version = 129 ;
THFLX:parameter_number = 202 ;
THFLX:add_offset = 0.f ;
THFLX:scale_factor = 0.08545183f ;
THFLX:vMin_user_specified = -1400.f ;
THFLX:vMax_user_specified = 1400.f ;
THFLX:vRange = 2800.f ;
short SLTFL(time, tlat, tlon) ;
SLTFL:_FillValue = 32767s ;
SLTFL:sub_center = "Environmental Modeling Center" ;
SLTFL:center = "US National Weather Service - NCEP (WMC)" ;
SLTFL:long_name = "Salt Flux" ;
SLTFL:units = "g/cm2/s" ;
SLTFL:level_indicator = 1 ;
SLTFL:gds_grid_type = 0 ;
SLTFL:parameter_table_version = 129 ;
SLTFL:parameter_number = 199 ;
SLTFL:add_offset = -1.6e-06f ;
SLTFL:scale_factor = 1.464888e-10f ;
SLTFL:vMin_user_specified = -4.e-06f ;
SLTFL:vMax_user_specified = 8.e-07f ;
SLTFL:vRange = 4.8e-06f ;
short SSHG(time, tlat, tlon) ;
SSHG:_FillValue = 32767s ;
SSHG:sub_center = "Environmental Modeling Center" ;
SSHG:center = "US National Weather Service - NCEP (WMC)" ;
SSHG:long_name = "Sea Surface Height Relative to Geoid" ;
SSHG:units = "m" ;
SSHG:level_indicator = 1 ;
SSHG:gds_grid_type = 0 ;
SSHG:parameter_table_version = 129 ;
SSHG:parameter_number = 198 ;
SSHG:add_offset = 0.f ;
SSHG:scale_factor = 0.0001831111f ;
SSHG:vMin_user_specified = -3.f ;
SSHG:vMax_user_specified = 3.f ;
SSHG:vRange = 6.f ;
short DBSS_OBIL(time, tlat, tlon) ;
DBSS_OBIL:_FillValue = 32767s ;
DBSS_OBIL:sub_center = "Environmental Modeling Center" ;
DBSS_OBIL:center = "US National Weather Service - NCEP (WMC)" ;
DBSS_OBIL:long_name = "Geometric Depth Below Sea Surface" ;
DBSS_OBIL:units = "m" ;
DBSS_OBIL:level_indicator = 238 ;
DBSS_OBIL:gds_grid_type = 0 ;
DBSS_OBIL:parameter_table_version = 129 ;
DBSS_OBIL:parameter_number = 195 ;
DBSS_OBIL:add_offset = 2500.f ;
DBSS_OBIL:scale_factor = 0.1525926f ;
DBSS_OBIL:vMin_user_specified = 0.f ;
DBSS_OBIL:vMax_user_specified = 5000.f ;
DBSS_OBIL:vRange = 5000.f ;
short DBSS_OBML(time, tlat, tlon) ;
DBSS_OBML:_FillValue = 32767s ;
DBSS_OBML:sub_center = "Environmental Modeling Center" ;
DBSS_OBML:center = "US National Weather Service - NCEP (WMC)" ;
DBSS_OBML:long_name = "Geometric Depth Below Sea Surface" ;
DBSS_OBML:units = "m" ;
DBSS_OBML:level_indicator = 237 ;
DBSS_OBML:gds_grid_type = 0 ;
DBSS_OBML:parameter_table_version = 129 ;
DBSS_OBML:parameter_number = 195 ;
DBSS_OBML:add_offset = 2500.f ;
DBSS_OBML:scale_factor = 0.1525926f ;
DBSS_OBML:vMin_user_specified = 0.f ;
DBSS_OBML:vMax_user_specified = 5000.f ;
DBSS_OBML:vRange = 5000.f ;
short V_FLX(time, ulat, ulon) ;
V_FLX:_FillValue = 32767s ;
V_FLX:sub_center = "Environmental Modeling Center" ;
V_FLX:center = "US National Weather Service - NCEP (WMC)" ;
V_FLX:long_name = "Momentum flux, v component" ;
V_FLX:units = "N/m^2" ;
V_FLX:level_indicator = 1 ;
V_FLX:gds_grid_type = 0 ;
V_FLX:parameter_table_version = 2 ;
V_FLX:parameter_number = 125 ;
V_FLX:add_offset = 0.f ;
V_FLX:scale_factor = 6.103702e-05f ;
V_FLX:vMin_user_specified = -1.f ;
V_FLX:vMax_user_specified = 1.f ;
V_FLX:vRange = 2.f ;
short U_FLX(time, ulat, ulon) ;
U_FLX:_FillValue = 32767s ;
U_FLX:sub_center = "Environmental Modeling Center" ;
U_FLX:center = "US National Weather Service - NCEP (WMC)" ;
U_FLX:long_name = "Momentum flux, u component" ;
U_FLX:units = "N/m^2" ;
U_FLX:level_indicator = 1 ;
U_FLX:gds_grid_type = 0 ;
U_FLX:parameter_table_version = 2 ;
U_FLX:parameter_number = 124 ;
U_FLX:add_offset = 0.f ;
U_FLX:scale_factor = 6.103702e-05f ;
U_FLX:vMin_user_specified = -1.f ;
U_FLX:vMax_user_specified = 1.f ;
U_FLX:vRange = 2.f ;
short SALTY(time, depth, tlat, tlon) ;
SALTY:_FillValue = 32767s ;
SALTY:sub_center = "Environmental Modeling Center" ;
SALTY:center = "US National Weather Service - NCEP (WMC)" ;
SALTY:long_name = "Salinity" ;
SALTY:units = "kg/kg" ;
SALTY:level_indicator = 160 ;
SALTY:gds_grid_type = 0 ;
SALTY:parameter_table_version = 2 ;
SALTY:parameter_number = 88 ;
SALTY:add_offset = 0.025f ;
SALTY:scale_factor = 1.525926e-06f ;
SALTY:vMin_user_specified = 0.f ;
SALTY:vMax_user_specified = 0.05f ;
SALTY:vRange = 0.05f ;
short VOGRD(time, depth, ulat, ulon) ;
VOGRD:_FillValue = 32767s ;
VOGRD:sub_center = "Environmental Modeling Center" ;
VOGRD:center = "US National Weather Service - NCEP (WMC)" ;
VOGRD:long_name = "v-component of current" ;
VOGRD:units = "m/s" ;
VOGRD:level_indicator = 160 ;
VOGRD:gds_grid_type = 0 ;
VOGRD:parameter_table_version = 2 ;
VOGRD:parameter_number = 50 ;
VOGRD:add_offset = 0.f ;
VOGRD:scale_factor = 0.000122074f ;
VOGRD:vMin_user_specified = -2.f ;
VOGRD:vMax_user_specified = 2.f ;
VOGRD:vRange = 4.f ;
short UOGRD(time, depth, ulat, ulon) ;
UOGRD:_FillValue = 32767s ;
UOGRD:sub_center = "Environmental Modeling Center" ;
UOGRD:center = "US National Weather Service - NCEP (WMC)" ;
UOGRD:long_name = "u-component of current" ;
UOGRD:units = "m/s" ;
UOGRD:level_indicator = 160 ;
UOGRD:gds_grid_type = 0 ;
UOGRD:parameter_table_version = 2 ;
UOGRD:parameter_number = 49 ;
UOGRD:add_offset = 0.f ;
UOGRD:scale_factor = 0.000122074f ;
UOGRD:vMin_user_specified = -2.f ;
UOGRD:vMax_user_specified = 2.f ;
UOGRD:vRange = 4.f ;
short DZDT(time, DEPTH, tlat, tlon) ;
DZDT:_FillValue = 32767s ;
DZDT:sub_center = "Environmental Modeling Center" ;
DZDT:center = "US National Weather Service - NCEP (WMC)" ;
DZDT:long_name = "Geometric vertical velocity" ;
DZDT:units = "m/s" ;
DZDT:level_indicator = 160 ;
DZDT:gds_grid_type = 0 ;
DZDT:parameter_table_version = 2 ;
DZDT:parameter_number = 40 ;
DZDT:add_offset = 0.f ;
DZDT:scale_factor = 1.22074e-07f ;
DZDT:vMin_user_specified = -0.002f ;
DZDT:vMax_user_specified = 0.002f ;
DZDT:vRange = 0.004f ;
short POT(time, depth, tlat, tlon) ;
POT:_FillValue = 32767s ;
POT:sub_center = "Environmental Modeling Center" ;
POT:center = "US National Weather Service - NCEP (WMC)" ;
POT:long_name = "Potential temperature" ;
POT:units = "K" ;
POT:level_indicator = 160 ;
POT:gds_grid_type = 0 ;
POT:parameter_table_version = 2 ;
POT:parameter_number = 13 ;
POT:add_offset = 285.f ;
POT:scale_factor = 0.001525925f ;
POT:vMin_user_specified = 260.f ;
POT:vMax_user_specified = 310.f ;
POT:vRange = 50.f ;
// global attributes:
:creation_date = "Wed Dec 14 14:56:47 MST 2005" ;
:sfcHeatFlux = "\n",
"Note that the net surface heat flux are the total surface heat flux \n",
"from the NCEP reanalysis 2 plus the relaxation terms." ;
:time_comment = "\n",
"To maintain consistency with NCEP: \n",
"The internal time stamp indicates the LAST day of the averaging period." ;
:caveat = "\n",
"There is a warm bias in GODAS before the early 1990s. \n",
"The GODAS uses 1992 as a start date for their climatology, \n",
"so 1992 onward may be best." ;
:NCL_Version = "4.2.0.a033" ;
:NCL = "modified ncl_grib2nc: grib2nc_GODAS.ncl_short" ;
:system = "IRIX64 tempest 6.5 07080049 IP35" ;
:conventions = "None" ;
:grib_file = "godas.M.200507.grb" ;
:html_REFERENCES = "http://www.cpc.ncep.noaa.gov/products/GODAS/background.shtml" ;
:html_BACKGROUND = "http://www.cpc.ncep.noaa.gov/products/GODAS/background.shtml" ;
:html_GODAS = "www.cpc.ncep.noaa.gov/products/GODAS" ;
:title = "GODAS: Global Ocean Data Assimilation System" ;
}
Back to the CAS Data Catalog
Back to the CAS Home PageDennis Shea: shea@ucar.edu