Articles | Volume 5, issue 2
https://doi.org/10.5194/gi-5-531-2016
https://doi.org/10.5194/gi-5-531-2016
Research article
 | 
22 Nov 2016
Research article |  | 22 Nov 2016

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

Anu Heikkilä, Jakke Sakari Mäkelä, Kaisa Lakkala, Outi Meinander, Jussi Kaurola, Tapani Koskela, Juha Matti Karhu, Tomi Karppinen, Esko Kyrö, and Gerrit de Leeuw

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Cited articles

Bais, A., Zerefos, C., and McElroy, C: Solar UVB measurements with the double- and single-monochromator Brewer Ozone Spectrophotometers, Geophys. Res. Lett., 23, 833–836, 1996.
Bais, A., Blumthaler, M., Gröbner, J., Seckmeyer, G., Webb, A. R., Görts, P., Koskela, T., Rembges, D., Kazadzis, S., Schreder, J., Cotton, P., Kelly, P., Kouremeti, N., Rikkonen, K., Studemund, H., Tax, R., and Wuttke, S.: Quality assurance of spectral ultraviolet measurements in Europe through the development of a transportable unit (QASUME), in: Ultraviolet Ground- and Space-Based Measurements, Models, and Effects II, edited by: Gao, W., Herman, J. R., Shi, G., Shibasoki, K., and Slusser, J. R., SPIE, 4896, 232–238, 2003.
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Damiani, A., De Simone, S. Rafanelli, C., Cordero, R., and Laurenza, M.: Three years of ground-based total ozone measurements in the Arctic: Comparison with OMI, GOME and SCIAMACHY satellite data, Remote Sens. Environ., 127, 162–180, 2012.
Eleftheratos, K., Kazadzis, S., Zerefos, C. S., Tourpali, K., Meleti, C., Balis, D., Zyrichidou, I., Lakkala, K., Feister, U., Koskela, T., Heikkilä, A., and Karhu, J. M.: Ozone and Spectroradiometric UV Changes in the Past 20 Years over High Latitudes, Atmos. Ocean., 53, 117–125, https://doi.org/10.1080/07055900.2014.919897, 2014.
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Short summary
Lamp measurements used for the UV irradiance calibration of two Brewer spectrophotometers operated for 20 years in Jokioinen and Sodankylä, Finland, were examined. Temporal development of the responsivity after fixing the irradiance measurements into a specific scale was studied. Both long-term gradual decrease and abrupt changes in responsiveness were detected. Frequent-enough measurements of working standard lamps were found necessary to detect the short-term variations in responsiveness.