Infrared atmospheric sounding interferometer

Siméoni, Denis; Singer, Clare E.; Chalon, G.

doi:10.1016/s0094-5765(97)00098-2

Cited by 80 publications

(45 citation statements)

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“…EUMETSAT (European Meteorological Satellite system) launched the MetOp (Meteorological Operational) satellite in October 2006, carrying the Infrared Atmospheric Sounding Interferometer (IASI), the first infrared interferometer on an operational meteorological satellite. The IASI instrument (Siméoni et al, 1997), developed by the Centre National d'Études Spatiales (CNES) in cooperation with EUMETSAT, is a cross-track scanning Michelson interferometer measuring between 645 cm −1 and 2760 cm −1 at 0.25 cm −1 intervals and 0.5 cm −1 spectral resolution.…”

Section: Introductionmentioning

confidence: 99%

Assimilation of IASI at the Met Office and assessment of its impact through observing system experiments

Hilton

Atkinson

English

et al. 2009

Quart J Royal Meteoro Soc

110

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ABSTRACT:Observations from the Infrared Atmospheric Sounding Interferometer (IASI), onboard EUMETSAT's MetOp satellite, have been assimilated at the Met Office in global and regional numerical weather-prediction systems since 27 November 2007. Pre-operational trials of IASI assimilation in the global model during the summer of 2007 delivered a positive impact on forecasts approximately twice as large as that shown by the Atmospheric InfraRed Sounder (AIRS) on the EOS-Aqua satellite. A series of observing system experiments confirmed the relative performance of IASI and AIRS, and showed that impact from IASI is equivalent to a single Advanced Microwave Sounding Unit-A (AMSU-A) combined with a single Microwave Humidity Sounder (MHS). The results of an IASI assimilation trial for the winter of 2007 were consistent with those of the summer trial, although the impact was slightly lower overall. The assessment of impact is strongly dependent on the variables and methods chosen for verification: assimilation trials with the regional model showed similar improvements to the large-scale fields (e.g. mean-sea-level pressure and geopotential height) as seen in the global model, but no forecast impact was seen for variables such as visibility and rain-rate.

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Section: Introductionmentioning

confidence: 99%

Assimilation of IASI at the Met Office and assessment of its impact through observing system experiments

Hilton

Atkinson

English

et al. 2009

Quart J Royal Meteoro Soc

110

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show abstract

“…The IASI instrument (Infrared Atmospheric Sounding Interferometer; Siméoni et al, 1997) on the MetOp-A satellite is a unique instrument for Earth observation (Phulpin et al, 2007). Since its launch in 2007, IASI has been used in a wide range of applications, including numerical weather prediction (NWP) (e.g.…”

Section: Introductionmentioning

confidence: 99%

Potential for the use of reconstructed IASI radiances in the detection of atmospheric trace gases

et al. 2010

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Abstract. Principal component (PC) analysis has received considerable attention as a technique for the extraction of meteorological signals from hyperspectral infra-red sounders such as the Infrared Atmospheric Sounding Interferometer (IASI) and the Atmospheric Infrared Sounder (AIRS). In addition to achieving substantial bit-volume reductions for dissemination purposes, the technique can also be used to generate reconstructed radiances in which random instrument noise has been reduced. Studies on PC analysis of hyperspectral infrared sounder data have been undertaken in the context of numerical weather prediction, instrument monitoring and geophysical variable retrieval, as well as data compression. This study examines the potential of PC analysis for chemistry applications.A major concern in the use of PC analysis for chemistry is that the spectral features associated with trace gases may not be well represented in the reconstructed spectra, either due to deficiencies in the training set or due to the limited number of PC scores used in the radiance reconstruction. In this paper we show examples of reconstructed IASI radiances for several trace gases: ammonia, sulphur dioxide, methane and carbon monoxide. It is shown that care must be taken in the selection of spectra for the initial training set: an iterative technique, in which outlier spectra are added to a base training set, gives the best results. For the four trace gases examined, key features of the chemical signatures are retained in the reconstructed radiances, whilst achieving a substantial reduction in instrument noise.A new regional re-transmission service for IASI is scheduled to start in 2010, as part of the EUMET-SAT Advanced Retransmission Service (EARS). For this

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“…IASI (Cayla, 2001;Simeoni et al, 1997) is a space-borne interferometer able to characterise the Earth infrared spectra in the range from 645 to 2760 cm −1 (15.5 to 3.63 µm) with a spectral resolution of 0.5 cm −1 , a spectral sampling of 0.25 cm −1 and 8461 channels divided in three different bands: The pixel size at nadir is 12 km, being acquired by four pixels per field of view. Each scan line is compounded by 30 views.…”

Section: Iasi and Iasi-ng Instrumentsmentioning

confidence: 99%

A simulated observation database to assess the impact of the IASI-NG hyperspectral infrared sounder

et al. 2018

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Abstract. The highly accurate measurements of the hyperspectral Infrared Atmospheric Sounding Interferometer (IASI) are used in numerical weather prediction (NWP), atmospheric chemistry and climate monitoring. As the second generation of the European Polar System (EPS-SG) is being developed, a new generation of IASI instruments has been designed to fly on board the MetOp-SG constellation: IASI New Generation (IASI-NG). In order to prepare the arrival of this new instrument, and to evaluate its impact on NWP and atmospheric chemistry applications, a set of IASI and IASI-NG simulated data was built and made available to the public to set a common framework for future impact studies. This paper describes the information available in this database and the procedure followed to run the IASI and IASI-NG simulations. These simulated data were evaluated by comparing IASI-NG to IASI observations. The result is also presented here. Additionally, preliminary impact studies of the benefit of IASI-NG compared to IASI on the retrieval of temperature and humidity in a NWP framework are also shown in the present work. With a channel dataset located in the same wave numbers for both instruments, we showed an improvement of the temperature retrievals throughout the atmosphere, with a maximum in the troposphere with IASI-NG and a lower benefit for the tropospheric humidity.

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Infrared atmospheric sounding interferometer

Cited by 80 publications

References 0 publications

Assimilation of IASI at the Met Office and assessment of its impact through observing system experiments

Assimilation of IASI at the Met Office and assessment of its impact through observing system experiments

Potential for the use of reconstructed IASI radiances in the detection of atmospheric trace gases

A simulated observation database to assess the impact of the IASI-NG hyperspectral infrared sounder

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