NOAA Optimum Interpolation Sea Surface Temperature Analysis

Contents

blue dotAnalysis Description and Recent Reanalysis
blue dot Latest Plots and Plot Archives
blue dot Gridded Data via FTP
blue dot Climatology
blue dot Related Links
blue dot References
blue dot Contact Information
blue dot Frequently Asked Questions

Analysis Description and Recent Reanalysis

The optimum interpolation (OI) sea surface temperature (SST) analysis is produced weekly on a one-degree grid. The analysis uses in situ and satellite SSTs plus SSTs simulated by sea ice cover. Before the analysis is computed, the satellite data is adjusted for biases using the method of Reynolds (1988) and Reynolds and Marsico (1993). A description of the OI analysis can be found in Reynolds and Smith (1994). The bias correction improves the large scale accuracy of the OI.

In November 2001, the OI fields were recomputed for late 1981 onward. The new version will be referred to as OI.v2.

The most significant change for the OI.v2 is the improved simulation of SST obs from sea ice data following a technique developed at the UK Met Office. This change has reduced biases in the OI SST at higher latitudes. Also, the update and extension of COADS has provided us with improved ship data coverage through 1997, reducing the residual satellite biases in otherwise data sparse regions.  For more details, see Reynolds, et al (2002).

Latest Plots and Plot Archives

tan dot Weekly Global SST Anomaly
tan dot Tropical Pacific weekly mean and anomaly SSTs
tan dot Monthly Global SST
tan dot Monthly Global SST Anomaly
tan dot Weekly Ship and Buoy Observations with estimated Ice Cover
tan dot Weekly AVHRR SST Retrievals

The following links will take you to directories containing plots for past weeks/months.

tan dot Weekly Anomaly Plot Archive
tan dot Tropical Pacific Weekly Mean and Anomaly Plot Archive
tan dot Monthly Global SST Plot Archive
tan dot Monthly Global SST Anomaly Plot Archive

You can make your own plots through the NCEP NOMADS Meteorological Data Server

tan dotInstructions to make maps are here
tan dot Instructions to make time series are here

Gridded Data via FTP

The weekly fields are available in binary files in:

     ftp://ftp.emc.ncep.noaa.gov/cmb/sst/oisst_v2/

Monthly fields are available in:

     ftp://ftp.emc.ncep.noaa.gov/cmb/sst/oimonth_v2/

Documentation with sample source codes to read the data are available as README files in the above directories.

The Data Support Section (DSS) of NCAR makes both available in ASCII at: http://rda.ucar.edu/datasets/ds277.0/
The NCAR archives may not be updated in real-time. So we have made recent data in NCAR's ascii format available on our server at:
     ftp://ftp.emc.ncep.noaa.gov/cmb/sst/oisst_v2/ASCII_UPDATE
and
     ftp://ftp.emc.ncep.noaa.gov/cmb/sst/oimonth_v2/ASCII_UPDATE
for weekly and monthly fields respectively.

The NOAA Earth System Research Laboratory (ESRL) makes these data available in NETCDF at: http://www.cdc.noaa.gov/cdc/data.noaa.oisst.v2.html

Climatology

A climatology based on the OI.v2 Reanalysis fields was developed at the Climate Prediction Center using the method of Reynolds and Smith (1995) and Smith and Reynolds (1998). This climatology is described in:

     http://www.cpc.noaa.gov/products/predictions/30day/SSTs/sst_clim.html

and available in:

     ftp://ftp.cpc.ncep.noaa.gov/wd52yx/sstclim/

Related Links

tan dot NOAA 1/4 degree Daily OI SST Analysis
tan dotNCDC's Extended Reconstructed Sea Surface Temperature (ERSST) Analysis Data


References

Reynolds, R.W., 1988: A real-time global sea surface temperature analysis. J. Climate, 1, 75-86.

Reynolds, R.W., 1993: Impact of Mount Pinatubo aerosols on satellite-derived sea surface temperatures. J. Climate, 6, 768-774.

Reynolds, R. W. and D. C. Marsico, 1993: An improved real-time global sea surface temperature analysis. J. Climate, 6, 114-119.

Reynolds, R. W. and T. M. Smith, 1994: Improved global sea surface temperature analyses. J. Climate, 7, 929-948.

Reynolds, R. W. and T. M. Smith, 1995: A high resolution global sea surface temperature climatology. J. Climate, 8, 1571-1583.

Smith, T. M. and R. W. Reynolds, 1998: A high resolution global sea surface temperature climatology for the 1961-90 base period. J. Climate, 11, 3320-3323.

Reynolds, R. W., N. A. Rayner, T. M. Smith, D. C. Stokes and W. Wang, 2002: An improved in situ and satellite SST analysis for climate. J. Climate, 15, 1609-1625.


Contact Information

Diane Stokes
Diane.Stokes@noaa.gov
301-683-3713

(Dick Reynolds is busy enjoying retirement)


Frequently Asked Questions

Click Here for FAQ



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