Articles | Volume 5, issue 1
Geosci. Instrum. Method. Data Syst., 5, 193–203, 2016

Special issue: Multi-disciplinary research and integrated monitoring at the...

Geosci. Instrum. Method. Data Syst., 5, 193–203, 2016

Research article 09 Jun 2016

Research article | 09 Jun 2016

Data flow of spectral UV measurements at Sodankylä and Jokioinen

Jakke Sakari Mäkelä1,a, Kaisa Lakkala1,2, Tapani Koskela1,b, Tomi Karppinen2, Juha Matti Karhu2, Vladimir Savastiouk4, Hanne Suokanerva2, Jussi Kaurola1, Antti Arola3, Anders Vilhelm Lindfors1, Outi Meinander1, Gerrit de Leeuw1,5, and Anu Heikkilä1 Jakke Sakari Mäkelä et al.
  • 1Finnish Meteorological Institute, Research and Development, Helsinki, Finland
  • 2Finnish Meteorological Institute, Sodankylä, Finland
  • 3Finnish Meteorological Institute, Kuopio, Finland
  • 4IOS Inc, Toronto, Canada
  • 5Department of Physics, University of Helsinki, Helsinki, Finland
  • anow at: University of Jyväskylä, Jyväskylä, Finland
  • bnow: an independent researcher

Abstract. The data flow involved in a long-term continuous solar spectral UV irradiance monitoring program is investigated and structured to provide an overall view on the multiphase process from data acquisition to the final products. The program employing Brewer spectrophotometers as measuring instruments is maintained by the Finnish Meteorological Institute (FMI) ever since the 1990s at two sites in Finland: Sodankylä (67° N) and Jokioinen (61° N). It is built upon rigorous operation routines, processing procedures, and tools for quality control (QC) and quality analysis (QA) under continuous development and evaluation. Three distinct levels of data emerge, each after certain phase in the data flow: Level 0 denoting raw data, Level 1 meaning calibrated data processed in near-real time, and Level 2 comprising of postprocessed data corrected for all distinguishable errors and known inaccuracies. The final products disseminated to the users are demonstrated to result from a process with a multitude of separate steps, each required in the production of high-quality data on solar UV radiation at the Earth's surface.

Short summary
We describe the steps that are used at the Finnish Meteorological Institute (FMI) to process spectral ultraviolet (UV) radiation measurements made with its three Brewer spectrophotometers, located in Sodankylä (67° N) and Jokioinen (61° N). Multiple corrections are made to the data in near-real time and quality control is also performed automatically. Several data products are produced, including the near-real-time UV index and various daily dosages, and submitted to databases.