Technical Note: Functional sliced inverse regression to infer temperature, water vapour and ozone from IASI data

Amato, Umberto; Antoniadis, Anestis; Feis, Italia De; Masiello, Guido; Matricardi, Marco; Serio, Carmine

doi:10.5194/acp-9-5321-2009

Cited by 26 publications

(10 citation statements)

References 17 publications

(20 reference statements)

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“…3 for the two surface coverages analyzed in this paper, namely, sea and desert sand. Methodology and validation of the scheme for the atmospheric parameters have been described in many papers [44][45][46][47][48][49][50][51], to which the reader is referred for further details. For brevity, we limit ourselves to the performance of the scheme.…”

Section: Resultsmentioning

confidence: 99%

Simultaneous physical retrieval of surface emissivity spectrum and atmospheric parameters from infrared atmospheric sounder interferometer spectral radiances

Masiello

Serio

2013

Appl. Opt.

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The problem of simultaneous physical retrieval of surface emissivity, skin temperature, and temperature, water-vapor, and ozone atmospheric profiles from high-spectral-resolution observations in the infrared is formulated according to an inverse problem with multiple regularization parameters. A methodology has been set up, which seeks an effective solution to the inverse problem in a generalized L-curve criterion framework. The a priori information for the surface emissivity is obtained on the basis of laboratory data alone, and that for the atmospheric parameters by climatology or weather forecasts. To ensure that we deal with a problem of fewer unknowns than observations, the dimensionality of the emissivity is reduced through expansion in Fourier series. The main objective of this study is to demonstrate the simultaneous retrieval of emissivity, skin temperature, and atmospheric parameters with a two-dimensional L-curve criterion. The procedure has been demonstrated with spectra observed from the infrared atmospheric sounder interferometer, flying onboard the European Meteorological Operational satellite. To check the quality and reliability of the methodology, we have used spectra recorded over regions characterized by known or stable emissivity. These include sea surface, for which effective emissivity models are known, and arid lands (Sahara and Namib Deserts) that are known to exhibit the characteristic spectral signature of quartz-rich sand.

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Section: Resultsmentioning

confidence: 99%

Simultaneous physical retrieval of surface emissivity spectrum and atmospheric parameters from infrared atmospheric sounder interferometer spectral radiances

Masiello

Serio

2013

Appl. Opt.

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“…Note that the operational product uses a statistical approach to retrieve the geophysical parameters. Other approaches use a physical scheme and give access to a better vertical resolution (e.g., Amato et al, 2009;Masiello et al, 2013). Nevertheless, the goal of this paper is to provide quantitative elements of validation for the operational product using the statistical approach.…”

Section: The Metop/iasi Satellite Datamentioning

confidence: 99%

Comparison of IASI water vapor retrieval with H<sub>2</sub>O-Raman lidar in the framework of the Mediterranean HyMeX and ChArMEx programs

et al. 2014

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Abstract. The Infrared Atmospheric Sounding Interferometer (IASI) is a new generation spaceborne passive sensor mainly dedicated to meteorological applications. Operational Level-2 products have been available via the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT) for several years. In particular, vertical profiles of water vapor measurements are retrieved from infrared radiances at the global scale. Nevertheless, the robustness of such products has to be checked because only a few validations have been reported. For this purpose, the field experiments that were held during the HyMeX and ChArMEx international programs are a very good opportunity. A H 2 ORaman lidar was deployed on the Balearic island of Menorca and operated continuously for ∼ 6 and ∼ 3 weeks during fall 2012 (Hydrological cycle in the Mediterranean eXperiment -HyMeX) and summer 2013 (Chemistry-Aerosol Mediterranean Experiment -ChArMEx), respectively. It measured simultaneously the water vapor mixing ratio and aerosol optical properties. This article does not aim to describe the IASI operational H 2 O inversion algorithm, but to compare the vertical profiles derived from IASI onboard (meteorological operational) MetOp-A and the ground-based lidar measurements to assess the reliability of the IASI operational product for the water vapor retrieval in both the lower and middle troposphere. The links between water vapor contents and both the aerosol vertical profiles and the air mass origins are also studied. About 30 simultaneous observations, performed during nighttime in cloud free conditions, have been considered. For altitudes ranging from 2 to 7 km, root mean square errors (correlation) of ∼ 0.5 g kg −1 (∼ 0.77) and ∼ 1.1 g kg −1 (∼ 0.72) are derived between the operational IASI product and the available lidar profiles during HyMeX and ChArMEx, respectively. The values of both root mean square error and correlation are meaningful and show that the operational Level-2 product of the IASI-derived vertical water vapor mixing ratio can be considered for meteorological and climatic applications, at least in the framework of field campaigns.

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“… The IASI spectrometer [4] was launched in 2012 onboard the polar orbiting meteorological satellite MetOp-B (Operational Meteorology), which forms the space segment of the overall EUMETSAT Polar System. In particular, low resolution vertical profiles of WVMR are retrieved from infrared radiances at the global scale [5]. Here, we use the IASI-derived WVMR operational Level-2 products available via EUMETSAT.…”

Section: Instruments and Modelsmentioning

confidence: 99%

Water Vapor Measurements by Mobile Raman Lidar Over The Mediterranean Sea in the Framework of HyMex: Application to Multi-Platform Validation of Moisture Profiles

Totems

Chazette

Shang

et al. 2016

EPJ Web of Conferences

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The Water Aerosol Lidar (WALI) system, deployed for 14 weeks during 2012 & 2013 on the island of Menorca, provided the Hydrological cycle in the Mediterranean eXperiment (HyMeX) with an opportunity to perform a multi-platform comparison on moisture retrievals at the timescales relevant for extreme precipitation events in the West Mediterranean basin. After calibration, the WALI lidar yields nighttime profiles of water vapor with ~7% accuracy from the ground up to 7 km, and daytime coverage of the lower layers, alongside common aerosol retrievals. It is used to characterize the water vapor profile product given by the IASI instrument on-board MetOp-B, and the fields simulated by the Météo-France AROME-WMED model and the open-source WRF model. IASI is found to be reliable above 1 km altitude, and the two models obtain similar high scores in the middle troposphere; WRF beneficiates from a more accurate modelling of the planetary boundary layer.

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Technical Note: Functional sliced inverse regression to infer temperature, water vapour and ozone from IASI data

Cited by 26 publications

References 17 publications

Simultaneous physical retrieval of surface emissivity spectrum and atmospheric parameters from infrared atmospheric sounder interferometer spectral radiances

Simultaneous physical retrieval of surface emissivity spectrum and atmospheric parameters from infrared atmospheric sounder interferometer spectral radiances

Comparison of IASI water vapor retrieval with H<sub>2</sub>O-Raman lidar in the framework of the Mediterranean HyMeX and ChArMEx programs

Water Vapor Measurements by Mobile Raman Lidar Over The Mediterranean Sea in the Framework of HyMex: Application to Multi-Platform Validation of Moisture Profiles

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Technical Note: Functional sliced inverse regression to infer temperature, water vapour and ozone from IASI data

Cited by 26 publications

References 17 publications

Simultaneous physical retrieval of surface emissivity spectrum and atmospheric parameters from infrared atmospheric sounder interferometer spectral radiances

Simultaneous physical retrieval of surface emissivity spectrum and atmospheric parameters from infrared atmospheric sounder interferometer spectral radiances

Comparison of IASI water vapor retrieval with H&lt;sub&gt;2&lt;/sub&gt;O-Raman lidar in the framework of the Mediterranean HyMeX and ChArMEx programs

Water Vapor Measurements by Mobile Raman Lidar Over The Mediterranean Sea in the Framework of HyMex: Application to Multi-Platform Validation of Moisture Profiles

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Comparison of IASI water vapor retrieval with H<sub>2</sub>O-Raman lidar in the framework of the Mediterranean HyMeX and ChArMEx programs