Meteosat Indian Ocean 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.
Product type	Near real time product
Status	Demonstrational
Identifier	OSI-IO-DLI
Acronym	MET IO DLI

CHARACTERISTICS
Processing level	L3
Satellite input	Meteosat-8/SEVIRI
Other input	ECMWF outputs (temperature, humidity and aerosols profiles)
Frequency	24 per day + 1 per day
Timeliness	2 h
Spatial coverage	East Atlantic, West Indian: 60N-60S 19.5W-101.5E
Spatial sampling	0.05° Lat-Lon
Characteristics & methods	bulk parametrization

ACCURACY REQUIREMENTS
Thresold accuracy	monthly relative bias : 10%, monthly relative Std. Deviation :20%
Target accuracy	monthly (TBC) relative bias : 5%, monthly relative Std. Deviation :10%
Optimal accuracy	monthly relative bias : 0%, monthly relative Std. Deviation : 3%
Verification/validation method	routine comparison with pyrgeometer measurements

DATA ACCESS
Diffusion mean(s) and format(s)	LML FTP Server (NetCDF4)
Main FTP server	LML FTP server (hosted by Ifremer)	Other FTP server, other mean(s) to access main server	backup LML FTP server (last 7 days) Thredds HTTPS
EUMETCast	EUMETCast	Discovery mean(s)
EUMETSAT Data Centre	EDC	Discovery mean(s)
Applications and users	Ocean atmosphere studies.	OSI SAF Producer	Météo-France

VIEW MORE		DOCUMENTATION
Product web page	Description	Product User Manual	PUM
Live production status	Status
Scientific Validation Report	SVR

HISTORY, COMMENTS
Authorised to be operational/released	04/11/2016
First product date	27/04/2017

Disclaimer : All intellectual property rights of the OSI SAF products belong to EUMETSAT. The use of these products is granted to every interested user, free of charge. If you wish to use these products, EUMETSAT’s copyright credit must be shown by displaying the words “Copyright © 2018 EUMETSAT” on each of the products used.

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