Description: Das Projekt "Sprektrale Referenzwerte für Atmosphärenbeobachtung" wird vom Umweltbundesamt gefördert und von Physikalisch-Technische Bundesanstalt durchgeführt. The HITRAN and GEISA databases are two of the best-known and most extensive resources for spectral line data containing several million data sets that include molecular line strengths, pressure broadening and line shift coefficients, ground state energies etc. for tens of molecular species. These data bases together with line by line codes allows atmospheric absorption spectra to be modelled and used to underpin some of the global atmospheric measurement efforts based on satellites, balloons, air planes and ground based measurement stations using LIDAR or FTIR instruments. The availability of highly accurate spectral data is essential for a qualitative and quantitative understanding of spectroscopic instrumentation as well as for modelling of radiation transport in atmospheric sciences and in many other scientific fields. Whilst the databases have been put together in an impressive long-term effort, with great expertise from diverse soures and have served the community well, quantitative estimates of atmospheric molecular species based on these data are often inaccurate due to a number of metrological issues. These include lacking information on the comparability of the retrieval algorithms or measurement conditions during the determination of such spectral data as well as missing or incompletely stated uncertainty of the measured gas pressure, gas temperature, effective absorption path length, path homogeneity or gas composition (including isotopic ratios). The consequences of lack of or missing information can result in large errors in climate modelling and data retrieval, of which there are many examples in the literature. The proposed JRP will address these deficits by establishing, in a joint metrology effort, an European spectroscopy infrastructure enabling traceable measurements of spectral line data under well controlled conditions at a central spectroscopic facility (CF). The CF, which will be validated and anchored (traced back) by means of high-resolution laser-based satellite facilities at the partners sites, will be used for the determination of accurate transition line data of atmospheric key molecular species over a broad range of atmospheric conditions that include determination of the temperature and pressure dependence of the line data. By concentrating the metrological expertise of the JRP partners on a central facility all measurands will be traced back to national standards, which will permit improved accuracy. The application and expansion of metrological codes will allow stating well-defined uncertainty ranges for all measured spectral parameters. The CF will be based on a. modified high-resolution VIS to MIR Fourier-Transform spectrometer (FTS) with a spectral resolution in the 10-3 cm-1. This CF-FTS is financed by PTB via its national budget. usw.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Messstation ? Resorption ? Lack ? Laser ? Lidar ? Skigebiet ? Temperaturabhängigkeit ? Atmosphärische Wissenschaften ? Absorptionslinie ? Flugzeug ? Messtechnik ? Satellit ? Spektralanalyse ? Temperatur ? Temperaturmessung ? Strahlung ? Gasförmiger Stoff ? Atmosphärenüberwachung ? Modellierung ? Daten ? Energie ? Standortwahl ? Witterung ? Klimamodell ? Absorptionsspektrum ? Berechnungsverfahren ? Messdaten ? Bodenluft ? Messung ? Ballonfahren ? Datenbank ? Ressource ? Gutachten ? Informationsgewinnung ? Kenngröße ? Klima ? Verkehrstechnik ? Globale Aspekte ? Referenzwert ? Konzentrat ? Verwertung ? Isotopenverhältnis ?
Region: Lower Saxony
Bounding box: 9.16667° .. 9.16667° x 52.83333° .. 52.83333°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2011-10-01 - 2014-09-30
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