30 March 2022
28 April 2020
The primary objective of the Infrared Atmospheric Sounding Interferometer (IASI) instrument measurements is to provide atmospheric emission spectra to derive temperature and humidity profiles with high vertical resolution and accuracy.
Additionally, it is used for the determination of trace gases such as ozone, nitrous oxide, carbon dioxide and methane, as well as land- and sea surface temperature and emissivity and cloud properties.
EARS-IASI Level 1 service specification
Satellites supported
Metop-B and Metop-C, as shown on the tables on the Regional Data Service/EARS webpage.
Product processing
Level 1 processing using OPS-LRS as provided by the NWP SAF. Principal Component Scores, channel selection and BUFR conversion using AAPP as provided by NWP SAF.
Product segmentation
One file per station per pass.
Products via EUMETCast Europe
Calibrated and geolocated IASI observations in a combined product containing both 300 Principal Component Scores and 500 original IASI Channels, cloud/scene analysis information, BUFR formatted.
Timeliness via EUMETCast
30 minutes.
Products via RMDCN/GTS
As for EUMETCast.
Archived in EUMETSAT
None.
EARS-IASI Level 2 operational pilot specification
The EARS-IASI Level 2 pilot adds to the existing EARS-IASI service and the products are currently generated where possible for the same stations and the same overpasses as the EARS-IASI Level 1 service.
Geographical coverage
Same as Level 1
Satellites supported
Metop-B and Metop-C, as shown on the tables on the Regional Data Service/EARS webpage.
Product processing
Inputs: EARS-IASI L1 products and corresponding EARS-ATOVS AMSU-A and MHS products.
Level 2 processing using the same statistical retrieval function PWLR3 (Piece Wise Linear Regression -cube) as for the IASI L2 global products processor, developed by EUMETSAT.
Product segmentation
One file per station per pass.
Products via EUMETCast Europe
Water vapour and temperature profiles as well as land surface temperature, sea surface temperature, land surface emissivity and surface pressure at individual IASI FoV resolution, together with corresponding quality indicators; in HDF-5 format.
Timeliness via EUMETCast
30 minutes.
Products via RMDCN/GTS
None
Archived in EUMETSAT
None.
Further information
For more information on EARS-IASI see TD 14 - EUMETSAT Advanced Retransmission Service Technical Description
Full details on products can be found in the Product Navigator:
IASI Regional Data Service Level 1 – 500 Selected Channels and Principal Component Scores – Metop
