Meteosat Downward Longwave Irradiance
| IDENTIFICATION |
| Description | Estimation 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. |
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| Product type | Archived NRT product |  |
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| Status | Superseded |
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| Identifier | OSI-303 |
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| Acronym | MET DLI |
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| Acronym for EDC (APNM) | OSIDDLI |
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| Product navigator reference | EO:EUM:DAT:MSG:OSI-303-H |
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| CHARACTERISTICS |
| Processing level | L3 |
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| Satellite input | MSG/SEVIRI |
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| Other input | ECMWF outputs (temperature, humidity and aerosols profiles) |
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| Frequency | 24 per day + 1 per day |
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| Timeliness | 2 h |
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| Spatial coverage | East Atlantic, West Indian: 60N-60S 60W-60E |
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| Spatial sampling | 0.05° Lat-Lon |
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| Characteristics & methods | bulk parametrization |
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| ACCURACY REQUIREMENTS |
| Thresold accuracy | monthly relative bias : 10%, monthly relative Std. Deviation :20% |
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| Target accuracy | monthly (TBC) relative bias : 5%, monthly relative Std. Deviation :10% |
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| Optimal accuracy | monthly relative bias : 0%, monthly relative Std. Deviation : 3% |
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| Verification/validation method | routine comparison with pyrgeometer measurements |
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| DATA ACCESS |
| Diffusion mean(s) and format(s) | EUMETCast (GRIB2)
LML FTP Server (NetCDF4)
EDC (GRIB2)
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| Main FTP server | Ifremer FTP server | Other FTP server,
other mean(s) to access main server |
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| EUMETCast | EUMETCast | Discovery mean(s) | |
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| EUMETSAT Data Centre | EDC |
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| Applications and users | Ocean atmosphere studies. | OSI SAF Producer | Météo-France |
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| HISTORY, COMMENTS |
- Replaced by OSI-303-a since 2018-02-20
- 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 on 2017-12-14T07:00:00Z
- EUMETSAT product navigator reference for GRIB files : EO:EUM:DAT:METEOSAT:OSIDDLI and EO:EUM:DAT:METEOSAT:OSIHDLI
- EUMETSAT product navigator reference for daily product : EO:EUM:DAT:MSG:OSI-303-D
- Using cloud type from NWC SAF software v2016 since product dated 2017-10-17 09:00 UTC
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| First product date | 06/12/2011 |
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| Last product date | 20/02/2018 |
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