Meteosat Downward Longwave Irradiance

IDENTIFICATION
DescriptionEstimation of the downward longwave irradiance reaching the Earth surface derived from SEVIRI data on board the geostationary satellite Meteosat. Algorithm is a bulk parametrization that uses NWP model outputs to calculate a clear sky Downward Longwave Irradiance (DLI), corrected according to satellite derived cloud information. The hourly product is interpolated at rounded UT hours, by a pixel dependant temporal interpolation between two consecutive satellite images. The value in the daily product is the integration of all the hourly values in the UT day. The product is remapped onto a 0.05° regular grid and expressed in W/m2.
Product typeNear real time productThumbnail
StatusOperational
IdentifierOSI-303
AcronymMET DLI
Acronym for EDC (APNM)OSIDDLI
Product navigator referenceEO:EUM:DAT:METEOSAT:OSIDDLI
CHARACTERISTICS
Processing levelL3
Satellite inputMSG/SEVIRI
Other inputECMWF outputs (temperature, humidity and aerosols profiles)
Frequency24 per day + 1 per day
Timeliness2 h
Spatial coverageEast Atlantic, West Indian: 60N-60S 60W-60E
Spatial sampling0.05° Lat-Lon
Characteristics & methodsbulk parametrization
ACCURACY REQUIREMENTS
Thresold accuracymonthly relative bias : 10%, monthly relative Std. Deviation :20%
Target accuracymonthly (TBC) relative bias : 5%, monthly relative Std. Deviation :10%
Optimal accuracymonthly relative bias : 0%, monthly relative Std. Deviation : 3%
Verification/validation methodroutine comparison with pyrgeometer measurements
DATA ACCESS
OSI SAF ProducerMétéo-France
Diffusion mean(s) and format(s)EUMETCast (GRIB2)
Ifremer FTP Server (NetCDF4)
EDC (GRIB2)
Link FTP serverIfremer FTP server
Applications and usersOcean atmosphere studies.
VIEW MORE DOCUMENTATION
Product web pageDescriptionProduct User ManualPUM
Live production statusStatus
Last products at a glanceQuicklookScientific Validation ReportSVR
Continuous monitoringQuality
HISTORY, COMMENTS
  • NetCDF-4 files are available on Ifremer FTP server in the same directories as the NetCDF-3 ones from 17/07/2017.
  • NetCDF-4 files are available on EUMETCast since 05/10/2017 in parallel of the dissemination in GRIB format.
  • Stop of NetCDF-3 and GRIB formats is planned mid-December 2017
  • Using cloud type from NWC SAF software v2016 since product dated 2017-10-17 09:00 UTC
First product date06/12/2011