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GHRSST Reanalysis/GCOS SST-SI Intercomparisons

The goal of the Global Climate Observing System's (GCOS) SST and Sea Ice (SI) Working Group is to understand differences between different SST analyses and reconstructions with the aim of producing better, long-term SST climate data records. By working in the context of the GHRSST Reanalysis effort, a second goal of linking the modern satellite-based records with the historical, primarily in situ - based records can be accomplished.

For modern, satellite-based products, this group has chosen an initial focus on weekly, one degree versions of the data sets as well as monthly, five degree versions. For the historical products, the group focuses on monthly, five degree versions of the data sets. The first milestone of this intercomparison effort is to provide each of the data sets on a common grid and in common, widely-used formats. Secondly, in order to quantitatively evaluate the differences between SST analyses, a set of standard diagnostics is calculated for each data set. These diagnostics are organized into two phases: the first evaluates each data set both with respect to the data set's own climatology and with respect to a common climatology; the second evaluates each data set with respect to every other data set. In the case of the satellite era diagnostics, the common climatology used is AVHRR Pathfinder V5, Quality Flag 7, from 1985-2007. For the historical diagnostics, the Hadley Centre SST V2 climatology from 1961-1990 was used.

Go to Descriptive Diagnostics for: Go to Intercomparison Diagnostics for:
Satellite Era (1981 - 2007) Satellite Era (1981 - 2007)
Historical Data (1850 - 2008) Historical Data (1850 - 2008)
Standard Deviation Map for Weekly Nighttime Operational AVHRR Time-Averaged Differences between Weekly Nighttime Pathfinder and OISSTv2
Descriptive Diagnostics include:
  • Standard deviation of anomalies in time
  • Linear trend of anomalies in time (historical data sets only)
  • Lag1 autocorrelation of anomalies in time (coming soon)
  • Time series of global and hemispheric anomalies
  • Time-latitude sections of anomalies
Intercomparison Diagnostics include:
  • Map of root mean square (RMS) differences
  • Map of time-averaged differences
  • Time series of global and hemispheric anomalies (historical data sets only)
  • Time-latitude sections of differences (historical data sets only)

Go to Data Sets

GCOS SST Intercomparison Satellite Era Data Sets
Data Set Name Resolution Date Range
AVHRR Pathfinder V5, Quality Flags 4-7 Weekly One Degree, Monthly Five Degree Jan 1985 - Dec 2007
AVHRR Pathfinder V5, Quality Flag 7 Weekly One Degree, Monthly Five Degree Jan 1985 - Dec 2007
Operational AVHRR Weekly One Degree Dec 1981 - Jul 2007
Hadley Centre SST V2 Weekly One Degree, Monthly Five Degree Dec 1981 - Nov 2005
NOAA Optimum Interpolation V2 Weekly One Degree, Monthly Five Degree Jan 1985 - Dec 2007
NOAA Daily 1/4-degree Optimum Interpolation Weekly One Degree, Monthly Five Degree Dec 1981 - Oct 2007
Hadley Centre Sea Ice and SST (HadISST) Monthly Five Degree Jan 1981- Nov 2007
NOAA Extended Reconstruction V3 Monthly Five Degree Jan 1981 - Oct 2007
Kaplan Reconstructed Monthly Five Degree Jan 1981 - Oct 2007

GCOS SST Intercomparison Historical Data Sets
Data Set Name Resolution Date Range
Hadley Centre SST V2 Monthly Five Degree Jan 1850 - Jun 2008
Hadley Centre Sea Ice and SST (HadISST) Monthly Five Degree Jan 1870 - Jun 2008
NOAA Extended Reconstruction V3 Monthly Five Degree Jan 1854 - Jun 2008
Kaplan Reconstructed Monthly Five Degree Jan 1856 - Jun 2008
International COADS Monthly Five Degree Jan 1850 - May 2007
COBE Monthly Five Degree Jan 1891 - Jun 2008

Operational Messages Access GHRSST Data LTSRF News
LTSRF Documents LTSRF Home SST-SI Intercomparisons

 

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  Last modified:    Sun, 17-Feb-2008 06:04 UTC NODC.Webmaster@noaa.gov
 
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