Atlantic High Latitude Downward Longwave Irradiance

Superseded Archived NRT product

Daily Downward Longwave Irradiance over Atlantic High Latitudes based on AVHRR data from Metop and NOAA satellites.

Acronym : AHL DLI
Product navigator reference :


OSI SAF producer : Norwegian Meteorological Institute
Identifier : OSI-301-b
Processing level : L3
Satellite input : AVHRR (Metop, NOAA)
Other input : NWP outputs
Temporal sampling : 1 per day
Central time : 12:00
Timeliness : ? The timeliness is the time elapsing from the sensing time of the last contributing file to the product dissemination to users. It is similar to the latency. 3h30
Spatial coverage : Atlantic North of 50N
Spatial sampling : 5 km
Projection : Polar Stereographic
File Formats : HL FTP Server (NetCDF4), EDC (NetCDF4), EUMETCast (NetCDF4)
Characteristics & methods : Bulk parameterization, including over sea ice
Data Access
Accuracy Requirements
Target accuracy : monthly relative absolute mean difference: 5 %, monthly relative standard deviation: 10 %
Verification/validation method : Comparison with pyrgeometers measurements
Applications and users
Usage : NWP, Ocean and biological modeling at operational and research centers.
Authorised to be operational / released :
Declared operational / released since :
On EUMETCast since :
On EDC since :
On FTP server since :
First date :
Last date :
  • This product superseded OSI-301.
    Main differences with OSI-301 are
    • the algorithm improvement, including over sea ice: new cloud type product from PPS v2014 (instead of v2009) and improved surface coefficients,
    • processing on swath data instead of fixed tiles,
    • the new output format (DLI and SSI combined in NetCDF4).
    At the beginning of 2020, the data used are the AVHRR data from Metop-A, Metop-B and NOAA-19.

New ticket helpdesk