Schlüsselwörter
(Englisch)
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Ultraviolet radiation; radiometer networks; quality assurance
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Forschungsprogramme
(Englisch)
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COST-Action 726 - Long term changes and climatology of UV radiation over Europe
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Kurzbeschreibung
(Englisch)
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This project is a crucial contribution to the COST 726 action, whose general aim is building a European UV Climatology, as it aims at improving the calibrating and characterisation procedures used in regional and national filter radiometer networks in Europe. The specific tasks will be to: 1)hold a broadband filter radiometer intercomparison and calibration campaign, 2) Create a reference group of filter radiometers, 3) Develop instrumentation for the laboratory characterisation of filter radiometers. The final goal will be to provide a laboratory calibration facility at PMOD/WRC as well as QA/QC procedures to European networks in order to homogenise UV measurements across Europe.
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Weitere Hinweise und Angaben
(Englisch)
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Full name of research-institution/enterprise: Physikalisch-Meteorologisches Observatorium Davos Weltstrahlungszentrum PMOD/WRC
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Partner und Internationale Organisationen
(Englisch)
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AT, BE, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GR, HU, IT, NL, NO, PL, PT, RO, SE, SK, UK
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Abstract
(Englisch)
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The main goal of the project was to homogenise solar UV measurements across Europe. The first task was to develop and establish a UV calibration facility at PMOD/WRC for the characterisation and calibration of UV radiometers. The laboratory consits now of a UV angular and spectral reponse setup. On the roof of the institute a large calibration plateform was constructed which can hold around 30 filter radiometers for absolute calibrations. The necessary calibration procedures were developed [Hülsen, et al., 2006]. In August 2006, a large-scale calibration and intercomparison campaign of radiometers measuring erythemally weighted solar irradiance was organized at PMOD/WRC. The analysis of this campaign showed that the original calibration of the majority of the reference broadband radiometers across Europe is within the uncertainty of the new calibration. However several instruments had to change their calibration factors by up to 50%. A further task of the project was the establishment of a UV reference at PMOD/WRC. This reference now consists of two types of instruments, spectroradiometers and broadband radiometers. The former are the transportable reference spectroradiometer QASUME and a Brewer #163 spectrophotometer. The later is a triad of radiometers, where each instrument is choosen from a different manufacturer - Yankee Enviromental Inc., Solar Light and Kipp & Zonen. During the two years of the project the spectroradiometer QASUME was used to homogenize solar UV measurements with site audits to six European institutes monitoring spectral solar UV radiation. In September 2007 the spectroradiometer joined the 2nd RBCC-E campaign at El Arenosillo, Spain. The reports of these campaigns will be available at the PMOD/WRC web-site. The instrument acted as the European UV reference for the 16 Brewer spectrophotometers and the 23 UV broadband radiometers which participated at this campaign. A key activity in 2007 was the analysis of results from the COST 726 measurement campaign held in 2006 and the production of the final report of this activity, which can be found at the COST726 web-site [Gröbner, et al., 2007]. This campaign also allowed comparing the calibration performance from seven international UV calibration laboratories [Hülsen, et al., 2008], a task which has been promoted by the CIMO Expert Team on Meteorological Radiation and Atmospheric Composition Measurements as well as by the GAW SAG UV.
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Datenbankreferenzen
(Englisch)
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Swiss Database: COST-DB of the State Secretariat for Education and Research Hallwylstrasse 4 CH-3003 Berne, Switzerland Tel. +41 31 322 74 82 Swiss Project-Number: C05.0068
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