Monitoring weather and climate from space

EARS-IASI
The EARS-IASI collects IASI instrument data from Metop satellite-passes via a network of HRPT stations and retransmits Level 1c products via EUMETCast and the GTS.


The primary objective of the [Internal link]Infrared Atmospheric Sounding Interferometer (IASI) instrument measurements is to provide an 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.

IASI Station Details

The planned subset of AHRPT stations supporting the EARS-IASI and the resulting geographical coverage are given in Figure 1.

 


Figure 1 - IASI Geographical Coverage

 

EARS IASI
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 pass
Products via EUMETCast Ku-Band Europe Calibrated and geolocated IASI observations in a combined product containing both 300 Principal Component Scores and 366 original IASI Channels, cloud/scene analysis information, BUFR formatted
Products via RMDCN/GTS Same as for EUMETCast



File Naming and Structure

<Instrument>_<SensingStartDate>_<SensingStartTime>_<satellite>_<orbit>_<service>_<TypeOfProcessing>_<ProductContents>_<AcquisitionStation>_<ProductLevel>_<ProductFormat>

The fields are as follows:

Field Description Example
<Instrument> Instrument name iasi
<SensingStartDate> Product start date YYYMMDD
<SensingStartTime> Product start time HHMMSS
<satellite> Satellite name metopa, metopb or metopc
<orbit> Orbit number (5 digits)
<service> EARS service = ear ear
<TypeOfProcessing> o=operational, t=testing o or t
<ProductContents> pcs = Principal Component Scores
<AcquisitionStation> Station where the satellite raw data was acquired (*) - see the station table below
<ProductLevel> L1
<ProductFormat> bufr



Example iasi_20110830_092026_metopa_25227_ear_o_pcs_lan.l1_bufr 

Pilot Phase and Service Trials

The pilot IASI Retransmission Service is a new EARS service. The purpose of the pilot phase is to enable the EUMETSAT Member States to assess the value of the proposed service, in particular for NWP applications.
During the pilot phase the detailed requirements for a potential future operational IASI Retransmission Service will be established in co-operation with Users based on the experience from the pilot phase.

EARS IASI HRPT Stations

Station Acronym Status
Athens ath Metop-A
Lannion lan Metop-A
Maspalomas mas Metop-A
Svalbard sva Metop-A based on X-band Fast Dump Extract System (FDES)
Kangerlussuaq kan Not covered by the Metop-A partial AHRPT service



Related Information

[Download link]TD 14 — The EUMETSAT Advanced Retransmission Service Technical Description (PDF, 1 MB)  

[External link]NWP SAF Site

 
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