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 AVHRR data.
Product typeNear real time productHigh Latitude Sea and Ice Surface Temperature
StatusOperational
IdentifierOSI-203-a
AcronymNHL L3 SST/IST
CHARACTERISTICS
Processing levelL3
Satellite inputMetop-B/AVHRR
Other inputECMWF outputs
Frequency2 per day
Central time00:00, 12:00
Timeliness3h30
Spatial coveragePoleward of 50N
Spatial sampling5 km
Projectionpolar stereographic
Characteristics & methodsSST : subskin temperature. Multispectral algorithms
IST : skin temperature. Multispectral algorithms.
Probabilities of open water and sea ice. Single sensor analysis
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 serverHL FTP server, last 31 days (hosted by MET Norway)Other FTP server,
other mean(s) to access main server
Archive HL FTP 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
VIEW MORE DOCUMENTATION
Product User ManualPUM
Live production statusProduction statusAlgorithm Theoretical Baseline DocumentATBD
Last products at a glanceQuicklooksScientific Validation ReportSVR
HISTORY, COMMENTS

Monthly accuracies. Extend to full Northern Hemisphere.
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.

Superseds OSI-203 from 03/04/2019, together with OSI-203-b.

Authorised to be operational/released10/10/2018
Declared operational/released03/04/2019
Expected date for operational/released03/04/2019
On EUMETCast since03/04/2019
In EDC since03/04/2019
First product date03/04/2019