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dimanche 30 novembre 2014

[hal-00924109] Atmospheric CO2 retrievals from GOSAT TANSO-FTS data

N/Afrom HAL : Dernières publications https://hal.archives-ouvertes.fr/search/hal/?omitHeader=true&q=%2A&fq=NOT+instance_s%3Asfo&fq=NOT+instance_s%3Adumas&fq=NOT+instance_s%3Amemsic&fq=NOT+%28instance_s%3Ainria+AND+docType_s%3A%28MEM+OR+PRESCONF%29%29&fq=NOT+%28instance_s%3Aa...

[hal-00443057] Airborne measurements of aerosol optical properties related to early spring transport of mid-latitude sources into the Arctic

Airborne lidar and in-situ measurements of the aerosol properties were conducted between Svalbard Island and Scandinavia in April 2008. Evidence of aerosol transport from Europe and Asia is given. The analysis of the aerosol optical properties based on a multiwavelength lidar (355, 532, 1064 nm) including...

[hal-00750122] On the effect of moisture on the detection of tropospheric turbulence from in situ measurements

The present paper addresses the detection of turbulence based on the Thorpe (1977) method applied to an atmosphere where saturation of water vapor occurs. The detection method proposed by Thorpe relies on the sorting in ascending order of a measured profile of a variable conserved through adiabatic...

[hal-00697491] Hindcast experiments of tropospheric composition during the summer 2010 fires over western Russia

The severe wildfires in western Russia during July-August 2010 coincided with a strong heat wave and led to large emissions of aerosols and trace gases such as carbon monoxide (CO), hydrocarbons and nitrogen oxides into the troposphere. This extreme event is used to evaluate the ability of the global...

samedi 29 novembre 2014

[insu-01021932] Magnetic induction and diffusion mechanisms in a liquid sodium spherical Couette experiment

We present a reconstruction of the mean axisymmetric azimuthal and meridional flows in the DTS liquid sodium experiment. The experimental device sets a spherical Couette flow enclosed between two concentric spherical shells where the inner sphere holds a strong dipolar magnet, which acts as a magnetic...

[hal-01084596] Quantum Theory of Helimagnetic Thin Films

We study properties of a helimagnetic thin film with quantum Heisenberg spin model by using the Green's function method. Surface spin configuration is calculated by minimizing the spin interaction energy. It is shown that the angles between spins near the surface are strongly modified with respect to...

[tel-00831642] Étude de la coalescence et du mûrissement dans les mousses liquides : des expériences modèles à différentes échelles.

Liquid foams are widely used in industry and in everyday life. However, their stability is not fully understood or fully controlled, their formulation being essentially empirical. It is therefore difficult to predict the ability of a surfactant solution to generate foam and to control their destabilization....

[tel-00831642] Étude de la coalescence et du mûrissement dans les mousses liquides : des expériences modèles à différentes échelles

[tel-00809290] Quantum transport of ultracold atoms in disordered potentials

In this thesis we study the quantum transport of matter waves with ultracold atoms. Such ultracold atom systems provide a very good control and a high flexibility of the parameters of the systems like the interactions, its dimensionality and the external potentials. This makes them a great tool for...

[tel-00809290] Quantum transport of ultracold atoms in disordered potentials

[hal-01063795] Sensitivity analysis of complex models: coping with dynamic and static inputs

In this paper, we address the issue of performing sensitivity analysis of complex models presenting uncertain static and dynamic inputs. The dynamic inputs are viewed as random processes which can be represented by a linear combination of the deterministic functions depending on time whose coefficients...

[hal-01088995] A 2D reconstruction for the transverse coupling of shallow water models

This work is dedicated to the modeling of exchanges between a river and its surrounding floodplains during floods overflowing its bed. Modeling flows in each subdomain, that of the river and that of the floodplain, has been the subject of numerous works for over 50 years and is now well understood....

[hal-00840190] Sur la mesure d'une force suiveuse mobile fléchissant une lame en grands déplacements

On s'intéresse à la force exercée par un patin mobile en translation fléchissant une lame élastique encastrée à une extrémité. Le contact étant supposé obéir à une loi de frottement de Coulomb, la force est suiveuse et la forme de la lame est donnée par l'elastica via une transformation homothétique...

[hal-00840190] Sur la mesure d'une force suiveuse mobile fléchissant une lame en grands déplacements

[hal-00796341] Lower tropospheric ozone at northern midlatitudes: Changing seasonal cycle

At northern mid-latitudes the abundance of tropospheric O3 has increased by a factor of approximately 2 since the 1950s. The cause of this increase is generally attributed to increasing anthropogenic precursor emissions, but present chemical and transport models cannot quantitatively reproduce its magnitude....

[hal-00778597] Year-round retrievals of trace gases in the Arctic using the Extended-range Atmospheric Emitted Radiance Interferometer

The Extended-range Atmospheric Emitted Radiance Interferometer (E-AERI) was installed at the Polar Environment Atmospheric Research Laboratory (PEARL) at Eureka, Nunavut, Canada in October 2008. Spectra from the E-AERI provide information about the radiative balance and budgets of trace gases in the...

[hal-00808110] Arctic ozone loss in Siberia in 2011 and 2012

The atmospheric ozone plays an important role in understanding of the processes occurring in the atmosphere and changes in the climate. Total ozone observations in Siberia were performed by Brewer MKIV No. 049 spectrophotometer in Tomsk, Western Siberia and SAOZ UV-Vis spectrometers deployed along the...

[hal-00817093] Vertical and horizontal transport of water vapour and aerosol in the tropical stratosphere from high-resolution balloon-borne observations. (poster)

We present the results of accurate balloon-borne observations of water vapor and aerosol obtained during a field campaign held in March 2012 in Bauru, Brazil (22.3 S) in the frame of a TRO-pico project. The aim of the TRO-pico project, supported by the French ANR, is to characterize the variability...

[hal-00817128] Evidence of much more intense land convection in the Southern than in the Northern tropics and tentative explanation. (poster)

Convective overshooting over tropical land areas is a key contributor to troposphere-to-stratosphere exchange, shown to inject in the lower stratosphere adiabatically cooled air (Pommereau and Held 2007, Cairo et al., 2011, Khaykin et al., 2012,), trace and chemically active gases (Ricaud et al., 2007,...

[hal-00822038] Seasonal variation of NO2 and O3 VCD at Río Gallegos, Argentine, using portable zenith-sky DOAS

[hal-00821957] Ozone depletion at temperature warmer than TNAT in the Arctic. (poster)

The unprecedented ozone destruction in the Arctic vortex in 2011 that extended until the end of March offers a unique opportunity for testing the relationship between temperature, responsible for heterogeneous chlorine activation on PSCs and aerosols and the amplitude of ozone loss. Indeed, as shown...

[hal-00989750] Tidal effects on stratospheric temperature series derived from successive Advanced Microwave Sounding Units

Stratospheric temperature series derived from the Advanced Microvave Sounding Unit on board successive NOAA satellites reveal during periods of overlap some bias and drifts. Part of the reason for these discrepancies could be associated with atmospheric tides as the orbits of these satellites drifted,...

[hal-00808439] Particles in the tropical UTLS from CALIPSO lidar measurements

[hal-01073965] Water vapor observations up to the lower stratosphere through the Raman lidar during the MAïdo LIdar Calibration Campaign

A new lidar system devoted to tropospheric and lower stratospheric water vapor measurements has been installed at the Maïdo altitude station facility of La Reunion Island, in the southern subtropics. The main objectives of the MAïdo LIdar Calibration Campaign (MALICCA), performed in April 2013, were...

[hal-00732464] Temperature of Polar Stratospheric Clouds formation in the Arctic and Antarctic

Polar Stratospheric Clouds (PSCs) induce a remarkable reddenings of the sky at twilight. Such reddening has been observed regularly by the SAOZ UV-visible spectrometers operating in polar regions in Dumont d'Urville in Antarctica and Sodankyla in Finland. The PSC detection is based on a Color Index...

[hal-00732514] Long-term evolution of tropical stratospheric O3 and NO2 Columns

The tropical region is the main entry point of the chemical species in the troposphere lifted and transported by convection in the stratosphere through the tropopause and redistributed to higher latitudes via the Brewer Dobson circulation. Thus any change in the distribution of stratospheric constituents...

[hal-00732567] Observation of solar UV radiation and total ozone column using ground based instruments in Rio Gallegos, Argentina (51°36'S, 69°19'W). (poster)

As a part of environmental studies in the southern hemisphere, the CEILAP (UNIDEF-MINDEF) Lidar Division with the financial support of JICA (Japan International Cooperation Agency) and the collaboration of LATMOS, France mounted a ground based remote sensing site at Río Gallegos city (51º 36'S, 69º...

[hal-00734081] Evaluation of Satellite Total Ozone and NO2 Columns Using the SAOZ UV-Vis Network

The full series of SAOZ network total ozone measurements in the visible Chappuis bands has been revised according to the spectral analysis and Air Mass Factor (AMF) settings recommended by the NDACC UV-Vis Working Group (Hendrick et al., 2011). They have been compared to overpass observations from the...

[hal-00739026] Local To Global Distributions of Atmospheric Ammonia. (poster)

[hal-00439408] First global ammonia distributions from infrared satellite observations

Infrared sounding of our atmosphere is at present confined to a number of species with lifetimes of several weeks to years. Short lived species are mainly confined to the boundary layer, close to their emission sources and for a long time it has been assumed that infrared instruments are not well suited...

[hal-00485499] Global and local ozone measurements from the thermal infrared IASI sounder for the monitoring of atmospheric composition

[hal-01005169] TIR retrievals of CO2, N2O and CH4 over the Arctic ocean from TANSO-FTS and comparison with IASI

The TANSO-FTS thermal infrared (TIR) spectra of GOSAT in band B4 are quite interesting to provide additional atmospheric information on what is available from the SWIR (B3 and B2) and NIR bands (B1). In this presentation the retrieval scheme based on the LARA radiative transfer and inversion algorithm...

[hal-01088959] Helium clusters doped with electronically excited alkali metal atoms

[hal-00439440] Monitoring of atmospheric composition using the thermal infrared IASI sounder

[hal-00485500] Using IASI trace gas retrievals to analyze the impact of fire emissions on air quality

[hal-01088957] Temperature dependence of sodium and ionized calcium resonance lines perturbed by helium

[hal-00672737] Thin films of SmFeO3 on quartz substrate modelled as anisotropic optical material. (poster)

[hal-00671761] Spectroscopie IR de molécules piégées en matrices à la fois du point de vue expérimental et de l'analyse des résultats expérimentaux par modélisation et simulation

[hal-00673356] Caractérisation d'un système fritté de nanoparticules d'argent par Analyses Spectroscopiques Complémentaire. (poster)

[hal-00672545] Reliabilty of Mechatronic systems from analysis by MEB and SE spectroscopy

[hal-00672519] Modelling optical ellipsometric parameters perovskite oxides thin films deposited by pulsed laser

[hal-00921248] Towards IASI-New Generation (IASI-NG): impact of improved spectral resolution and radiometric noise on the retrieval of thermodynamic, chemistry and climate variables

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...

[hal-00638646] High resolution assimilation of IASI ozone data with a global CTM

The pixel size of the Infrared Atmospheric Sounding Interferometer (IASI) remote sensor is much smaller than the horizontal grid size of current Chemical Transport Models (CTMs). In order to assimilate the maximum of information from the IASI retrievals, we have increased the horizontal resolution of...

[hal-00546155] Validation of IASI Ozone profiles using balloon sounding data

Here we present a validation of IASI vertical ozone profiles. This has been done using balloon ozonesonde data, which have a vertical resolution of about 100 m and measures ozone from the surface up to an altitude of about 30 km. IASI vertical ozone profiles are given as partial ozone columns [in DU...

[hal-00614632] Using Thermal Infrared Absorption and Emission to Determine Trace Gases

The light emerging from the top of the atmosphere in the greater part of the infrared region is thermal radiation from the Earth's surface. The resultant spectra obtained depend on the temperature difference between the emitting feature and absorbing gas. In this region the greenhouse gases, carbon...

[hal-01005478] IASI METOP L1C analyses for methane and carbone dioxide over 5 years

During the last decade, remote sensing sounders have demonstrated their capability for monitoring atmospheric composition and pollution. The Infrared Atmospheric Sounding Interferometer (IASI) instrument delivers more than 1.3x106 spectra per day and provides global coverage twice a day. It is characterized...

[hal-01004655] Status and evolution of the operational IASI L2 products at EUMETSAT: An introduction to the version 6

Geophysical parameters from the IASI instrument on Metop-A are essential products provided from EUMETSAT's Central Facility in near real time. They include vertical profiles of temperature and humidity, related cloud information, surface emissivity and temperature, and atmospheric composition parameters...

[hal-00816523] The IASI mission after 2020: what to expect for atmospheric composition monitoring. (poster)

In terms of Earth observing capability, the horizon is shrinking as only a few new satellite missions have been approved and will be financed in the coming years. This is particularly true for polar-orbiting nadir viewing instruments using the thermal radiation emitted by the Earth's surface to probe...

[hal-00732699] Validation of MIPAS IMK/IAA ozone profiles

We present the results of extensive validation program of Version V5R_O3_220 of ozone vertical profiles retrieved with IMK/IAA MIPAS scientific level 2 processor from version 5 of spectral Level 1 files provided by ESA. The time period covered corresponds to Reduced Resolution period of MIPAS instrument,...

[hal-00734141] Biogenic Methanol and Formic Acid Constrained from IASI Measurements

Methanol and formic acid, the simplest alcohol and carboxylic acid in the atmosphere, are directly emitted from anthropogenic activities, fire events and vegetation, as well as from photochemical sources. They are removed from the atmosphere through OH oxidation, and wet and dry deposition, and their...

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dimanche 30 novembre 2014

samedi 29 novembre 2014

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