Abstract
Abstract. Measurements of total ozone column and effective cloud transmittance have been performed since 1995 at the three Norwegian sites Oslo/Kjeller, Andøya/Tromsø, and in Ny-Ålesund (Svalbard). These sites are a subset of nine stations included in the Norwegian UV monitoring network, which uses ground-based ultraviolet (GUV) multi-filter instruments and is operated by the Norwegian Radiation and Nuclear Safety Authority (DSA) and the Norwegian Institute for Air Research (NILU). The network includes unique data sets of high-time-resolution measurements that can be used for a broad range of atmospheric and biological exposure studies. Comparison of the 25-year records of GUV (global sky) total ozone measurements with Brewer direct sun (DS) measurements shows that the GUV instruments provide valuable supplements to the more standardized ground-based instruments. The GUV instruments can fill in missing data and extend the measuring season at sites with reduced staff and/or characterized by harsh environmental conditions, such as Ny-Ålesund. Also, a harmonized GUV can easily be moved to more remote/unmanned locations and provide independent total ozone column data sets. The GUV instrument in Ny-Ålesund captured well the exceptionally large Arctic ozone depletion in March/April 2020, whereas the GUV instrument in Oslo recorded a mini ozone hole in December 2019 with total ozone values below 200 DU. For all the three Norwegian stations there is a slight increase in total ozone from 1995 until today. Measurements of GUV effective cloud transmittance in Ny-Ålesund indicate that there has been a significant change in albedo during the past 25 years, most likely resulting from increased temperatures and Arctic ice melt in the area surrounding Svalbard.
Highlights
The amount of stratospheric ozone decreased significantly both globally and over Norway during the 1980s and 1990s (WMO, 2018; Svendby and Dahlback, 2004)
Corrected ground-based ultraviolet (GUV) total ozone column (TOC) have been compared to GOME-2A and OMI TM3DAM v4.1 (Eskes et al, 2003) data for Oslo, Andøya, and Ny-Ålesund
Système d’Analyse par Observation Zénithale (SAOZ)) data and that any offset between Brewer and satellite data most likely will be reflected by offset in GUV–GOME-2 and GUV–OMI ozone data
Summary
The amount of stratospheric ozone decreased significantly both globally and over Norway during the 1980s and 1990s (WMO, 2018; Svendby and Dahlback, 2004). This decrease was mainly caused by the release of ozone-depleting substances (ODSs). This network consists of nine ground-based ultraviolet (GUV) radiometers located at sites between 58 and 79◦ N (Fig. 1).
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