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Geoscientific Instrumentation, Methods and Data Systems An interactive open-access journal of the European Geosciences Union

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Geosci. Instrum. Method. Data Syst., 5, 193-203, 2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
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 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.

Citation: Mäkelä, J. S., Lakkala, K., Koskela, T., Karppinen, T., Karhu, J. M., Savastiouk, V., Suokanerva, H., Kaurola, J., Arola, A., Lindfors, A. V., Meinander, O., de Leeuw, G., and Heikkilä, A.: Data flow of spectral UV measurements at Sodankylä and Jokioinen, Geosci. Instrum. Method. Data Syst., 5, 193-203,, 2016.
Publications Copernicus
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.
We describe the steps that are used at the Finnish Meteorological Institute (FMI) to process...