High Latitude L2 Sea and Sea Ice Surface Temperature

Operational Near real time product

This product, in GHRSST compliant netCDF format, is a stand-alone High Latitude Level 2 Surface Temperature product. It consists of Sea and Sea Ice Surface temperatures (SST and IST) and an unvalidated test temperature field, Land Ice Surface Temperature (LIST) for the Greenland and Antarctic ice caps. The product covers the sea and ice areas polewards of latitudes 50N and 50S with 3-minute data segments in Level 2, with data processed and archived continuously throughout the day, as they become available (approximately 110 3-minute segments per day per hemisphere). The product is derived from Metop-A AVHRR data and cloud mask data using the PPS software from the NWC SAF.

Acronym : HL L2 SST/IST
Product navigator reference :


OSI SAF producer : Norwegian Meteorological Institute
Identifier : OSI-205-b
Processing level : L2
Satellite input : NPP/VIIRS
Frequency : Up to 15 files/day
Central time : NA
Timeliness : 3h
Spatial coverage : Poleward of 50N
Spatial sampling : 1 km
Projection : Swath
File Formats : HL FTP Server (NetCDF4), EDC (NetCDF4), EUMETCast (NetCDF4)
Characteristics & methods : SST: subskin temperature.
IST: skin temperature.
Multispectral algorithms.
Including uncertainties.
Data Access
Main Diffusion Means : HL FTP server, last 4 days (hosted by MET Norway) :
Archive HL FTP server (hosted by MET Norway) :
Other means :


Accuracy Requirements
Target accuracy : SST absolute mean difference: 0.7 K, SST standard deviation: 1.0 K; IST absolute mean difference: 1.5 / 3.5 K, IST standard deviation: 2.0 / 3.0 K
Verification/validation method : SST: Comparison with buoy observations. IST: IST: comparison IR radiometer when available and with buoy measurements on the ice
Applications and users
Usage : * Operational Met Services,
* Operational analyses and ocean models,
* Research or Environmental monitoring
Authorised to be operational / released :
Declared operational / released since :
On EUMETCast since :
On EDC since :
On FTP server since :
Expected date for operational/released :
First date :
  • See also OSI-205-a (same product but based on Metop-B data)

New ticket helpdesk