A5072409020- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Atmospheric chemistry and aerosols
- Spectroscopy and Laser Applications
- Atmospheric aerosols and clouds
- Meteorological Phenomena and Simulations
- Calibration and Measurement Techniques
- Climate variability and models
- Fire effects on ecosystems
- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Spacecraft and Cryogenic Technologies
- Ionosphere and magnetosphere dynamics
- Radiative Heat Transfer Studies
- Planetary Science and Exploration
- Spacecraft Design and Technology
- Geochemistry and Geologic Mapping
- Precipitation Measurement and Analysis
- Astro and Planetary Science
- Laser Design and Applications
- Aeolian processes and effects
- Infrared Target Detection Methodologies
- Optical Systems and Laser Technology
- Flow Measurement and Analysis
- Advanced Chemical Sensor Technologies
École Polytechnique
2016-2025
Sorbonne Université
2017-2025
École Normale Supérieure - PSL
2020-2025
Centre National de la Recherche Scientifique
2016-2025
Université Paris Sciences et Lettres
2018-2025
Laboratoire de Météorologie Dynamique
2014-2024
Institut Pierre-Simon Laplace
2002-2024
Université Paris-Saclay
2017-2021
Office National d'Études et de Recherches Aérospatiales
1993-2018
Université Paris Cité
2017
The Infrared Atmospheric Sounding Interferometer (IASI) forms the main infrared sounding component of European Organisation for Exploitation Meteorological Satellites's (EUMETSAT's) Operation (MetOp)-A satellite (Klaes et al. 2007), which was launched in October 2006. This article presents results first 4 yr operational IASI mission. performance instrument is shown to be exceptional terms calibration and stability. quality data has allowed rapid use observations numerical weather prediction...
Abstract. Simultaneous observations from the Infrared Atmospheric Sounding Interferometer (IASI) and Advanced Microwave Unit (AMSU), launched together onboard European MetOp platform in October 2006, are used to retrieve an upper tropospheric content of carbon dioxide (CO2) covering range 11–15 km (100–300 hPa), clear-sky conditions, tropics, over sea, for first year operation (January 2008–December 2008). With its very high spectral resolution, IASI provides fourteen channels 15 μm band...
Abstract. Besides their strong contribution to weather forecast improvement through data assimilation, thermal infrared sounders onboard polar-orbiting platforms are now playing a key role for monitoring atmospheric composition changes. The Infrared Atmospheric Sounding Interferometer (IASI) instrument developed by the French space agency (CNES) and launched EUMETSAT Metop satellite series is providing essential inputs forecasting pollution/climate owing its smart combination of large...
Abstract. We show that mineral dust optical depth and altitude can be retrieved from the Aqua - Advanced Infrared Radiation Sounder (AIRS) measurements. Sensitivity studies performed with a high spectral resolution radiative transfer code effect on brightness temperatures may reach about 10 Kelvins for some channels. Using Look-Up-Table approach, we retrieve not only µm but also of Saharan layer, above Atlantic Ocean, April to September 2003. A key point our method is its ability satellite...
Midtropospheric mean atmospheric CO 2 concentration is retrieved from the observations of NOAA series polar meteorological satellites, using a nonlinear regression inference scheme. For 4 years present analysis (July 1987 to June 1991), monthly means over tropics (20°N 20°S) 10 show very good agreement with what presently known. Not only phase seasonal variations (location peaks) but also their amplitude and latitudinal evolution match quite well recent in situ made by properly equipped...
Abstract. Simultaneous observations from the Infrared Atmospheric Sounding Interferometer (IASI) and Advanced Microwave Unit (AMSU), launched together onboard European MetOp platform in October 2006, are used to retrieve a mid-to-upper tropospheric content of methane (CH4) clear-sky conditions, tropics, over sea, for first 16 months operation (July 2007–October 2008). With its high spectral resolution, IASI provides nine channels 7.7 μm band highly sensitive CH4 with reduced sensitivities...
Abstract. Monthly mean infrared (10 μm) dust layer aerosol optical depth (AOD) and altitude are simultaneously retrieved over the tropics (30° S–30° N) from almost seven years of Atmospheric Infrared Sounder (AIRS) observations covering period January 2003 to September 2009. The method developed relies on construction look-up-tables computed for a large selection atmospheric situations follows two main steps: first, determination observed thermodynamic situation and, second, properties. A...
Midtropospheric carbon dioxide (CO 2 ) concentration is retrieved in the tropics [20S:20N], over sea, at night, for period April to October 2003 from Atmospheric Infrared Sounder (AIRS) observations. The method relies on a non‐linear regression inference scheme using neural networks. A rough estimate of mean precision about 2.5 ppmv (0.7%). seasonal cycle and its latitudinal dependence agree well with aircraft CO situ measurements made same altitude range. Maps produced monthly basis...
Abstract. Major limitations of our present knowledge the global distribution CO2 in atmosphere are uncertainty atmospheric transport and sparseness situ concentration measurements. Limb viewing spaceborne sounders such as Atmospheric Chemistry Experiment Fourier transform spectrometer (ACE-FTS) offer a vertical resolution few kilometres for profiles, which is much better than currently flying or planned nadir sounding instruments can achieve. After having demonstrated feasibility obtaining...
Abstract. Infrared Atmospheric Sounder Interferometer (IASI) observations covering the period from July 2007 to December 2011 are interpreted in terms of monthly mean, 1°×1°, 10 μm dust Aerosol Optical Depth (AOD), mean altitude and coarse mode effective radius. The geographical study area includes northern tropical Atlantic northwest Arabian Sea, both characterised by strong, regular events. method developed relies on construction Look-Up-Tables computed for a large selection atmospheric...
Abstract. Since July 2007, monthly averages of mid-tropospheric methane have been retrieved in the tropics over land and sea, by day night, from IASI onboard MetOp-A, yielding a complete view geographical distribution, seasonality long-term tendency mid-troposphere. Retrieved displays clear seasonal cycle ~25 ppbv northern tropics, with maximum November minimum April–May, more complex ~15 southern south-to-north latitudinal variation ~30 – good agreement regular aircraft measurements...
From 1979 to present, sensors aboard the NOAA series of polar meteorological satellites have provided continuous measurements earth's surface and atmosphere. One these sensors, TIROS-N Operational Vertical Sounder (TOVS), observes earth-emitted radiation in 27 wavelength bands within infrared microwave portions spectrum, thereby creating a valuable resource for studying climate our planet. The NOAA–NASA Pathfinder program was conceived make data more readily accessible community form...
Satellite instruments specifically designed to monitor atmospheric carbon dioxide concentrations have not been flown date but, high‐resolution infrared sounders, being launched in the next few years, may offer possibility of at least a basic monitoring capability. This paper explores sensitivity this new generation advanced sounders changing and also compares with uncertainties due temperature, water vapor, minor constituent using current background errors numerical weather prediction models...
Abstract. This article presents a retrieval method and statistical analysis of the bulk microphysical properties semi-transparent ice clouds using Atmospheric Infrared Sounder (AIRS). The relies on spectral differences cirrus emissivities in 8–12 μm range is sensitive to effective crystal diameter (De) water path (IWP) up 85 120 g m−2, respectively. An indication most frequent habit has been obtained by separately single scattering column-like aggregate-like crystals simulations....
Abstract. Global cloud climatologies have been built from 13 years of Atmospheric Infrared Sounder (AIRS) and 8 Sounding Interferometer (IASI) observations, using an updated Clouds Sounders (CIRS) retrieval. The CIRS software can handle any infrared (IR) sounder data. Compared to the original retrieval, it uses improved radiative transfer modelling, accounts for atmospheric spectral transmissivity changes associated with CO2 concentration incorporates latest ancillary data (atmospheric...
Satellite remote sensing of global greenhouse gas (GHG) concentrations provides invaluable information about GHG sources and sinks, supporting efficient climate mitigation policies. Recently, the accuracy targets upcoming satellite missions have become increasingly stringent (2 ppb CH4; 1 ppm CO2).Up to now, calibration traceability observations relies on two networks ground-based stations: Total Carbon Column Observing Network (TCCON) COllaborative (COCCON). Both are able observe same...