Description: Das Projekt "A Century of Atmospheric Transmission over Davos" wird vom Umweltbundesamt gefördert und von Physikalisch-Meteorologisches Observatorium Davos und Weltstrahlungszentrum (PMOD,WRC) durchgeführt. A Century of Atmospheric Transmission over Davos Measurements of the solar radiation at the Physikalisch-Meteorologisches Observatorium Davos (PMOD) started in 1909 and are continued to present time. Radiometry and its application in meteorology have been a focal point of research activities at PMOD and have lead to the establishment of the World Radiation Center (WRC) in 1971 by the World Meteorological Organization. This long-term measurement series provides not only a detailed climatology of the insolation at Davos, including secular trends, but also contains information about the atmospheric transmission and its variability over the past century. The current scientific discussion about 'Global Dimming' starting in the late 50's and subsequent 'Brightening' after the late 80's, refers to the observed world-wide changes of insolation since the second half of the 20th century and their impact on global warming. The proposed causes for these variations, changing atmospheric transmission and cloudiness, are not separable from global (directed + diffuse) radiation alone. Additional observations of the direct solar radiation are required that can be evaluated in terms of apparent atmospheric transmission which in turn is dominated by aerosol extinction and water vapor absorption. Aerosol extinction of sun light represents a negative or cooling effect that is compensating to some extent the climate warming by greenhouse gases. This SNF project will compile the historic and recent solar measurement at PMOD, supplemented by observation available from Meteo Swiss (MCH), into a homogeneous time series spanning 100 years. Apparent atmospheric transmission will be inferred from these data by a proven method and analyzed for secular and decadal trends. Based on the high quality of measurements at Davos and modern radiative transfer calculations the project will model the total atmospheric transmission in terms of aerosol extinction and water vapor absorption. This project will retrieve time series of atmospheric parameters through reanalysis of existing observational data that are valuable in the assessment of climatic change in Switzerland.
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Resorption ? Davos ? Schweiz ? Artenverlust ? Klimatologie ? Meteorologie ? Wasserdampf ? Blei ? Globale Verdunkelung ? Absorption ? Aerosol ? Radiometrie ? Wirkung ? Gasförmiger Stoff ? Globale Erwärmung ? Beleuchtung ? Bewertung ? Zeitreihe ? Daten ? Wirkung ? Rechtsverfahren ? Messung ? Kenngröße ? Klimawandel ? Körperschaft ? Kühlung ? Licht ? Berechnung ? Solarstrahlung ? Trübung ? Globale Aspekte ? Treibhausgas ? Änderung ? Forschung ? Transmission ? Strahlung ? BEREICH ? DAUER ? GEGENWART ? Global brightening ? METHODE ? NEU ? Aerosol optical depth ? PROJEKT ? Temperaturerhöhung ? VERFUEGBAR ? VERSCHIEBUNG ? Verwertung ? WISSENSCHAFTLICH ? Zeitverlauf ? atmospheric transmission ? BESTEHEND ? BETRACHTUNG ? BRENNPUNKT ?
License: cc-by-nc-nd/4.0
Language: Englisch/English
Time ranges: 2009-06-01 - 2012-05-31
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