Lessons on Satellite Meteorology Part VII: Metop Introduction to Metop Instruments The sounders with focus on IASI The GRAS instrument The ASCAT scatterometer The EARS retransmission system SEVIRI BEL archive
Jan 01, 2016
Lessons on Satellite MeteorologyPart VII: Metop
Introduction to MetopInstrumentsThe sounders with focus on IASIThe GRAS instrumentThe ASCAT scatterometerThe EARS retransmission systemSEVIRI BEL archive
Metop satellite
− European contribution to the IJPS (Initial Join Polar System)
− Replace the NOAA morning orbit satellite
− Metop orbit in 102 minutes
− Payload of instruments coming from Europe and US.
− Metop-A launched October 2006 − Now fully operational but…− Exception for the HRPT (High Resolution Picture Transmission) retransmission system
RMIB HRPT antenna
The sounding instruments: IASI, MHS, AMSU-A1 & -A2, HIRS/4
Atmospheric profiles
assimilation in NWP
Atmospheric chimistry
Precipitation estimate
Soil temperature
IASI level 2 (geophysical products)
TWT: temperature and water vapour atmospheric profiles + surface skin temperature (90 levels)
OZO: ozone “profiles” (currently 4 layers)
TRG : trace gases (CO, CH4, N2O, CO2)
EMS: surface emissivity (12 wavelengths)
CLP: cloud parameters
IASI observations over Belgium (17 Nov. 2007)
selected pixel
Observations at 9:18 and 20:45 UTC (+ some at 10:58 UTC)
GRAS – GPS Receiver for Atmospheric Sounding
Level 1 available +/- 500 occultations/day
Spatial resolution: +/- 300km
Level 2 processing by the GRAS SAF. Availability in April 2008.
Usage:Assimilation in NWP
Climate monitoring (transfer troposphere <-> stratosphere)
ASCAT, the Advanced Scatterometer
Active radar sensing of the ocean surface wind
C-band, 5.2555 GHz
12.5 km
KNMI processing (OSI SAF)
Assimilated at ECMWF since July 2007
Day-2 products: soil humidity (TU Wien)
Metop products
EUMETSAT products:
ATOVS and IASI
SAF products:
GRAS SAF: atmospheric profiles
OZONE: total ozone, ozone profile, NO2, UV index from GOME-2
Nowcasting: cloud and precipitation from AVHRR + AMSU
OSI: surface wind (ASCAT), sea ice, SST, ocean surf. Radiation,
LSA: soil humidity (ASCAT), …
Summary of part II -- Metop
Metop data already assimilated at ECMWF (IASI, ASCAT)
Improvement in southern hemisphere
Large panel of products based on different sensing techniques
Not very efficient for nowcasting in Northern countries due to HRPT problems
Activation of redundant HRPT non before 2008