In search of traceability : two decades of calibrated Brewer UV measurements in Sodankyla and Jokioinen

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dc.contributor University of Helsinki, Department en Heikkilä, Anu Makelä, Jakke Sakari Lakkala, Kaisa Meinander, Outi Kaurola, Jussi Koskela, Tapani Karhu, Juha Matti Karppinen, Tomi Kyro, Esko De Leeuw, Gerrit 2016-12-22T07:59:01Z 2016-12-22T07:59:01Z 2016-11-22
dc.identifier.citation Heikkilä , A , Makelä , J S , Lakkala , K , Meinander , O , Kaurola , J , Koskela , T , Karhu , J M , Karppinen , T , Kyro , E & De Leeuw , G 2016 , ' In search of traceability : two decades of calibrated Brewer UV measurements in Sodankyla and Jokioinen ' Geoscientific Instrumentation, Methods and Data Systems , vol. 5 , no. 2 , pp. 531-540 . DOI: 10.5194/gi-5-531-2016 en
dc.identifier.issn 2193-0856
dc.identifier.other PURE: 77191432
dc.identifier.other PURE UUID: 923c2ae1-ac1c-4397-88cc-6c4c590e34c1
dc.identifier.other WOS: 000388721800001
dc.identifier.other Scopus: 84997113427
dc.description.abstract The two Brewer spectrophotometers of the Finnish Meteorological Institute at Jokioinen and Sodankyla have been operated according to the highest levels of the WMO/GAW (World Meteorological Organization/Global Atmosphere Watch) recommendations with rigorous quality control and quality assurance. The calibration of the instruments is based on annual recalibrations of primary standard lamps in the VTT MIKES Metrology National Standards Laboratory in Finland and an exhaustive measurement program with measurements of standard and working lamps in the on-site optical laboratories. Over the years, the maintenance of the calibration has produced data sets of approximately 2000 lamp scans for both instruments. An extensive re-examination of the lamp measurements and the response of the spectrophotometers was carried out. The primary standard lamps were found to age on an average rate of 0.3% per burn. The responsivity at wavelength 311 nm was found to exhibit both long-term and short-term changes. The overall long-term change was declining. In addition, abrupt changes of as large as 25% were detected. The short-term changes were found to fluctuate on time frames shorter than the interval between the measurements of the primary standard lamps. This underlines the importance of the use of more frequently measured working standard lamps. en
dc.format.extent 10
dc.language.iso eng
dc.relation.ispartof Geoscientific Instrumentation, Methods and Data Systems
dc.rights en
dc.subject TOTAL OZONE en
dc.subject EUROPE en
dc.subject OMI en
dc.subject 114 Physical sciences en
dc.title In search of traceability : two decades of calibrated Brewer UV measurements in Sodankyla and Jokioinen en
dc.type Article
dc.description.version Peer reviewed
dc.type.uri info:eu-repo/semantics/other
dc.type.uri info:eu-repo/semantics/publishedVersion

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