Northern High Latitude L3 Sea and Sea Ice Surface Temperature

IDENTIFICATION
DescriptionNRT 12 hourly aggregated SST and IST product for northern high latitudes (Poleward of 50N). It is based on VIIRS data.
Product typeNear real time productHigh Latitude Sea and Ice Surface Temperature
StatusDevelopment
IdentifierOSI-203-b
AcronymNHL L3 SST/IST
CHARACTERISTICS
Processing levelL3
Satellite inputNPP/VIIRS
Other inputNWP outputs, OSTIA SST analysis
Frequency12 h
Central time00:00, 12:00
Timeliness3h30
Spatial coveragePoleward of 50N
Spatial sampling5 km
Projectionpolar stereographic
Characteristics & methodsSST : subskin temperature.
IST : skin temperature.
Probabilities of open water and sea ice.
Multispectral algorithms.
ACCURACY REQUIREMENTS
Thresold accuracySST bias: 1.5 K SST std: 1.5 K; IST bias: 2.5 / 4.5 K IST std: 3.0 / 4.0 K; PoD: 0.65 FAR: 0.40
Target accuracySST bias: 0.7 K SST std: 1.0 K; IST bias: 1.5 / 3.5 K IST std: 2.0 / 3.0 K; PoD: 0.80 FAR: 0.20
Optimal accuracySST bias: 0.1 K SST std: 0.3 K; IST bias: 0.5 / 0.8 K IST std: 0.8 / 1.0 K; PoD: 0.90 FAR: 0.10
Verification/validation methodSST : comparison with buoy measurements; IST: Comparison with buoy measurements on the ice, and IR radiometer when available; Comparison with high resolution manual ice charts
DATA ACCESS
Diffusion mean(s) and format(s)EUMETCast (NetCDF4)
EDC (NetCDF4)
HL FTP Server (NetCDF4)
Main FTP serverOther FTP server,
other mean(s) to access main server


EUMETCastEUMETCastDiscovery mean(s)
EUMETSAT Data CentreEDC
Applications and users* Operational Met Services * Operational analyses and ocean models * Research or Environmental monitoring.OSI SAF ProducerNorwegian Meteorological Institute
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HISTORY, COMMENTS

Monthly accuracies.
Include sea ice surface temperature and Sea Ice Probabilities.
The IST accuracy requirements are split in two: the first is for validation against in situ IR radiometers, the second for in situ buoy data. The reason for this is discussed in the ATBD for OSI-205.

 

Authorised to be operational/released10/10/2018