20 research outputs found
Systematic comparison between the ground based automated Dobson of the Observatory of Haute-Provence and TOMS since 1983
Get PDFThe total ozone quantity has been obtained since September 1983 at O.H.P. using the conventional AD wavelength technique. An average of 180 measurements per year is obtained with the Dobson n deg 85. Each of these daily total quantities is in fact an average of at least 5 measurements. The preliminary comparison with TOMS data show good agreement. We discuss systematic daily and monthly comparisons
Programme atmosphere moyenne : observations DOBSON de l'ozone en France
No full textAvailable from INIST (FR), Document Supply Service, under shelf-number : RP 185 (4035) / INIST-CNRS - Institut de l'Information Scientifique et TechniqueSIGLEMinistere de l'Environnement, 75 - Paris (France). Service de la Recherche et des Affaires Economiques (SRAE)FRFranc
The visible and near ultraviolet rotation-vibration spectrum of HOD
No full textA Fourier transform spectrum has been recorded of a H2O/D2O vapor mixture in the wavenumber range 16, 300 to 22, 800 cm−1 using a long path cell. 410 lines of HDO are assigned to the OH stretching overtone bands 5v3, 6v3 and 7v3 plus combination bands. Assignments for the 6v3 and 7v3 bands represent the first data for the 006 and 007 states and give band origins of 19, 836.88 cm−1 and 22, 625.50 cm−1, respectively. Rotational term values for these states are also obtained. © 2001 Academic Press.SCOPUS: ar.jinfo:eu-repo/semantics/publishe
Analyse et traitement statistique des resultats des mesures de concentration atmospherique d'ozone: tendance evolutive a moyen terme Variabilite temporelle des constituants de l'atmosphere moyenne
No full textCNRS RP 245(15) / INIST-CNRS - Institut de l'Information Scientifique et TechniqueSIGLEFRFranc
Absorption cross-sections of NO2: Simulation of temperature and pressure effects
No full textThe measurements of the NO2 absorption cross sections by several authors have been considered in order to derive its temperature and pressure dependences in the 13 200-42 000 cm-1 spectral range. The temperature dependence is assumed to be linear in the temperature range investigated (217.0-298.5 K), whereas the influence of the total pressure is expressed as a temperature-dependent broadening coefficient. From measurements performed with mixtures of NO2 in air and in N2, values of γ0air (296 K) and γ0N2 (296 K) were found to be, respectively, 0.081 ± 0.002 and 0.069 ± 0.003 cm-1 atm-1. The temperature coefficient n obtained in the present work is 0.8 ± 0.1. The parameterization of the cross sections developed in this work can reproduce measured cross sections within 4%.info:eu-repo/semantics/publishe
High-resolution Fourier transform measurement of the NO2 visible and near-infrared absorption cross sections: Temperature and pressure effects
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Fourier Transform Spectroscopy of the O2 Herzberg Bands I. Rotational Analysis
No full textThe absorption spectra of the O2 Herzberg band systems (A3Σ+u-X3Σ -g, c1Σ-u-X3Σ -g, and A′ 3Δu-X3Σ-g) lying in the wavelength region 240-300 nm were reinvestigated. The coupling of a long absorption cell and a high-resolution Fourier transform spectrometer has allowed the observation of numerous weak lines which were not reported previously. From the rotational analysis of the line positions, determined with an accuracy of 0.005 cm-1, the molecular constants of the A3Σ+u, v = 0-12, c1Σ-u, v = 2-19, and A′ 3Δu, v = 2-12 levels are improved significantly. The interaction between the A and c states is described quantitatively. A new interpretation of the perturbations observed in the energy region close to the dissociation limit is given which involves a weakly bound 3Πu state as the most probable perturbing state.info:eu-repo/semantics/publishe
Fourier transform spectroscopy of the O2 Herzberg bands. III. Absorption cross sections of the collision-induced bands and of the Herzberg continuum
No full textinfo:eu-repo/semantics/publishe
