NOAA Daily 25km Global Optimally Interpolated Sea Surface Temperature (OISST) in situ and AVHRR analysis supplemented with AVHRR Pathfinder Version 5.0 climatological SST for inland and coastal pixels, from 1981-09-01 to 2010-12-31 (NCEI Accession 0071180)
This dataset contains the daily 25km global Optimally Interpolated Sea Surface Temperature (OISST) in situ and AVHRR analysis, supplemented with AVHRR Pathfinder Version 5.0 climatological SST for inland and coastal pixels, for 1981-09-01 through 2010-12-31. These SST data files were used during the processing of AVHRR Pathfinder Version 5.2 (PFV52) in the following ways:
1. As a first guess SST, used in the calculation of the PFV52 SST value from the brightness temperatures measured by the AVHRR instrument.
2. As a reference SST, against which the final PFV52 SST value is checked. If the difference between these two SST values is too great, the PFV52 SST is assigned a lower quality flag value.
1. As a first guess SST, used in the calculation of the PFV52 SST value from the brightness temperatures measured by the AVHRR instrument.
2. As a reference SST, against which the final PFV52 SST value is checked. If the difference between these two SST values is too great, the PFV52 SST is assigned a lower quality flag value.
Dataset Citation
- Cite as: Casey, Kenneth S.; US National Oceanographic Data Center (2011). NOAA Daily 25km Global Optimally Interpolated Sea Surface Temperature (OISST) in situ and AVHRR analysis supplemented with AVHRR Pathfinder Version 5.0 climatological SST for inland and coastal pixels, from 1981-09-01 to 2010-12-31 (NCEI Accession 0071180). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0071180. Accessed [date].
Dataset Identifiers
ISO 19115-2 Metadata
gov.noaa.nodc:0071180
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Ordering Instructions | Contact NCEI for other distribution options and instructions. |
Distributor |
NOAA National Centers for Environmental Information +1-301-713-3277 NCEI.Info@noaa.gov |
Dataset Point of Contact |
NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Time Period | 1981-09-01 to 2010-12-31 |
Spatial Bounding Box Coordinates |
West: -180
East: 180
South: -90
North: 90
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Data Presentation Form | Digital table - digital representation of facts or figures systematically displayed, especially in columns |
Dataset Progress Status | Complete - production of the data has been completed Historical archive - data has been stored in an offline storage facility |
Data Update Frequency | As needed |
Supplemental Information | Description of processing steps performed to generate these files: 1. The 4km AVHRR Pathfinder Version 5.0 daily harmonic climatology is binned down to 25km spatial resolution. If any single 4km pixel in the bin is water, the entire 25km pixel is classified as water. 2. A 25km land mask* is laid on top of the 25km binned climatology to identify water pixels with missing SST values. 3. A daily mean sea ice climatology, generated from the 10km EUMETSAT Ocean and Sea Ice Satellite Application Facility (OSISAF) Global Daily Sea Ice Concentration Reprocessing Data Set (NCEI accession 0068294), is binned to 25km spatial resolution. If any single 10km pixel in the bin is water, the entire 25km pixel is classified as water. 4. The 25km ice climatology field is filled with values of 100% sea ice cover over the permanent ice shelves in Antarctica. These permanent ice shelves are defined by the difference between the 25km OSISAF land mask and the 25km Pathfinder Version 5.2 land mask below -60 degrees latitude. 5. For pixels with no existing daily SST climatology value, AND a sea ice climatology value greater than zero, an SST value of -1.8 degrees Celsius is assigned. 6. Remaining water pixels with no SST values are assigned annual mean SST values derived from the daily harmonic climatology. 7. Any remaining water pixels are assigned latitudinal mean SST values derived from the daily harmonic climatology. The result is an effectively gap-free daily SST climatology. 8. The original NOAA Daily 25km Global Optimally Interpolated Sea Surface Temperature (OISST) analysis is read from the NODC archive. Any pixel that is missing an SST value in the OISST but has an SST value in the gap-free daily climatology is assigned the value from the daily climatology. 9. This new gap-filled OISST field is written out to netCDF to be ingested by SeaDAS during Pathfinder Version 5.2 processing. *Provenance of 25km Pathfinder Version 5.2 land mask: a) Land pixels were determined by rasterizing to 4km the Global Self-consistent Hierarchical High-resolution Shoreline (GSHHS) Database from the NOAA National Geophysical Data Center using a 50% area threshold. Inland water bodies (rivers and lakes) were determined by rasterizing to 4km the US World Wildlife Fund's Global Lakes and Wetlands Database using a 50 percent area threshold. b) This 4km land mask was binned to 25km spatial resolution. If any single 4km pixel in the bin was water, the entire 25km pixel was classified as water. Filename convention for the files in this accession: [avhrr-only]-[v2]-[pfv52].[YYYYMMDD].[nc.gz] avhrr-only: AVHRR-only version of the NOAA Daily OISST was used, rather than the version containing both AVHRR and AMSR data. v2: Version 2 of the NOAA Daily OISST pfv52: AVHRR Pathfinder Version 5.2 YYYYMMDD: Year, month and day of data nc.gz: gzipped netCDF file Example filename: avhrr-only-v2-pfv52.20080701.nc.gz About AVHRR Pathfinder Version 5.2: The AVHRR Pathfinder Version 5.2 (PFV52) sea surface temperature product was created in partnership with the University of Miami with partial support from the NOAA Climate Data Record Program. PFV52 was computed using an entirely modernized system, based on SeaDAS and incorporating several key changes in preparation for the future Version 6 (PFV6) data set. These changes include the use of an entirely new land mask, a modified grid, and the inclusion of sea ice and wind speed auxiliary data to support the use of the SST data. Importantly, the PFV52 data are provided in netCDF-4 (classic model, with internal compression and chunking) and are nearly 100% compliant with the GHRSST Data Specification Version 2.0 for L3C products. The PFV52 data deviate from that standard only in that the sses_bias, sses_standard_deviation, and sst_dtime variables are empty and the aerosol_dynamic_indicator variable is not yet present. |
Purpose | This dataset is available to the public for a wide variety of uses including scientific research and analysis. |
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Last Modified: 2024-01-07T17:48:13Z
For questions about the information on this page, please email: ncei.info@noaa.gov
For questions about the information on this page, please email: ncei.info@noaa.gov