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NOAA Daily (non-interpolated) Outgoing Longwave Radiation (OLR)

Brief Description:

• Gridded OLR data from NCEP without interpolation. See the Interpolated OLR dataset for an interpolated version. More Details...

Temporal Coverage: Daily values from 2002/01/01 to present (from twice daily Advanced Very High Resolution Radiometer (AVHRR) soundings for OLR). Long term means for daily values for 1979-1995. Spatial Coverage: 2.5 degree latitude x 2.5 degree longitude global grid (144x73). 90N - 90.0S, 0.0E - 357.5E.

Levels:

• N/A

Update Schedule:

• Daily

Download/Plot Data:

Variable	Statistic	Level	Units	Download File	Create Plot/Subset
Outgoing Longwave Radiation	Mean (Daily)	Top of Atmosphere	W/m^^2	olr.day.mean.nc
Outgoing Longwave Radiation	Long Term Mean (Daily)	Top of Atmosphere	W/m^^2	olr.daily.ltm.1979-1995.nc

Usage Restrictions:

• None but any feedback would be useful.

Detailed Description:

• OLR data from NCAR archives, with gaps.

  Example FORTRAN code that will read the data from the netCDF file can be found in ftp://ftp.cdc.noaa.gov/Datasets/interp_OLR/readolr.f

Caveats:

• New satellite source.
• As of 2005/08/07, this data set was switched from the NOAA-16 (last day 2005/08/07) satellite to the NOAA-18 satellite. The NOAA-18 bird crosses the equator at 0130 and 1330.

• The sun-synchronous orbit means that at some locations and times 'night' will follow 'day', while at others 'day' will follow 'night', and there is a longitude at which the local time switches by nearly 24 hours. However, taking a daily mean of the day and night passes, as is done for this dataset, avoids the issue of which is observed first, and serves to reduce the effective time jump that occurs at the aforementioned longitude to 12 hours.
  

Related File Naming & Structure Information:

File Names:

• var.time.stat.nc   (In directory: /Datasets/uninterp_OLR/)

OpenDap File Names:

• https://psl.noaa.gov/thredds/dodsC/Datasets/uninterp_OLR/var.time.stat.nc   

Dataset Format and Size:

• PSL standard NetCDF 88 Mbyte file for each daily file (packed).
• PSL standard NetCDF 7.7 Mbyte file for each daily long term mean file (packed).

Missing Data:

• Missing data is flagged with a value of 32766s.
• June 21, 2015 is missing (missing at source).

Citation:

• Please note: If you acquire Uninterpolated OLR data products from PSL, we ask that you acknowledge us in your use of the data. This may be done by including text such as Uninterpolated OLR data provided by the NOAA/OAR/ESRL PSL, Boulder, Colorado, USA, from their Web site at https://psl.noaa.gov/ in any documents or publications using these data. We would also appreciate receiving a copy of the relevant publications. This will help PSL to justify keeping the Uninterpolated OLR data set freely available online in the future. Thank you!

References:

• None

Original Source:

• We retrieve data directly from NOAA's National Center for Environmental Prediction (NCEP).

Contact:

• Physical Sciences Laboratory: Data Management
  NOAA/ESRL/PSL
  325 Broadway
  Boulder, CO 80305-3328
  psl.data@noaa.gov