Atlantic High Latitude Downward Longwave Irradiance

IDENTIFICATION
DescriptionDaily Downward Longwave Irradiance over Atlantic High Latitudes based on AVHRR data from Metop and NOAA satellites.
Product typeNear real time productThumbnail
StatusOperational
IdentifierOSI-301-b
AcronymAHL DLI
Acronym for EDC (APNM)ODLISSIAHL
CHARACTERISTICS
Processing levelL3
Satellite inputAVHRR (Metop, NOAA)
Other inputNWP outputs
Frequency1 per day
Central time12:00
Timeliness3h30
Spatial coverageAtlantic North of 50N
Spatial sampling5 km
ProjectionPolar Stereographic
Characteristics & methodsBulk parameterization, including over sea ice
ACCURACY REQUIREMENTS
Thresold accuracymonthly relative bias: 10 %, monthly relative Std. Deviation: 20 %
Target accuracymonthly relative bias: 5 %, monthly relative Std. Deviation: 10 %
Optimal accuracymonthly relative bias: 0 %, monthly relative Std. Deviation: 3 %
Verification/validation methodComparison with pyrgeometers measurements
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 usersNWP, Ocean and biological modeling at operational and research centers.OSI SAF ProducerNorwegian Meteorological Institute
VIEW MORE DOCUMENTATION
Product web pageDescriptionProduct User ManualPUM
Live production statusStatusAlgorithm Theoretical Baseline DocumentATBD
Last products at a glanceQuicklookScientific Validation ReportSVR
HISTORY, COMMENTS

This product is going to replace 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.

Authorised to be operational/released13/03/2020
Declared operational/released21/04/2020
First product date20/03/2020