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Quality Assurance of the Brewer Uv Measurements in Finland : Volume 8, Issue 1 (29/01/2008)

By Lakkala, K.

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Book Id: WPLBN0003998216
Format Type: PDF Article :
File Size: Pages 41
Reproduction Date: 2015

Title: Quality Assurance of the Brewer Uv Measurements in Finland : Volume 8, Issue 1 (29/01/2008)  
Author: Lakkala, K.
Volume: Vol. 8, Issue 1
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2008
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Gröbner, J., Koskela, T., Arola, A., Kaurola, J., Lakkala, K., Tanskanen, A.,...Meinander, O. (2008). Quality Assurance of the Brewer Uv Measurements in Finland : Volume 8, Issue 1 (29/01/2008). Retrieved from http://gutenberg.cc/


Description
Description: Finnish Meteorological Institute, Arctic Research Centre, Sodanlylä, Finland. The quality assurance of the two Brewer spectrophotometers of the Finnish Meteorological Institute is discussed in this paper. The complete data processing chain from raw signal to high quality spectra is presented. The quality assurance includes daily maintenance, laboratory characterizations, calculation of long term spectral responsivity, data processing and quality assessment. The cosine correction of the measurements is based on a new method, and included in the data processing software. The results showed that the actual cosine correction factor of the Finnish Brewers can vary between 1.08–1.13 and 1.08–1.12, respectively, depending on the sky radiance distribution and wavelength. The temperature characterization showed a linear temperature dependence between the internal temperature and the photon counts per cycle, and a temperature correction was used for correcting the measurements. The long term spectral responsivity was calculated using time series of several lamps using two slightly different methods. The long term spectral responsivity was scaled to the irradiance scale of the Helsinki University of Technology (HUT) for the whole measurement time periods 1990–2006 and 1995–2006 for Sodankylä and Jokioinen, respectively. Both Brewers have participated in many international spectroradiometer comparisons, and have shown good stability. The differences between the Brewers and the portable reference spectroradiometer QASUME have been within 5% during 2002–2007.

Summary
Quality assurance of the Brewer UV measurements in Finland

Excerpt
Arola, A., Kaurola, J., Koskinen, L., Tanskanen, A., Tikkanen, T., Taalas, P., Herman, J., Krotkov, N., and Fioletov, V.: A new approach to estimate the albedo for snow-covered surface in space-borne retrieval method, J. Geophys. Res., 108, 4531, \doi10.1029/2003JD003492, 2003a.; Arola, A., Lakkala, K., Bais, A., Kaurola, J., Meleti, C., and Taalas, P.: Factors affecting short- and long-term changes of spectral UV irradiance at two European stations, J. Geophys. Res., 108, 4549, \doi10.1029/2003JD003447, 2003b.; 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., Kazadzis, S., Balis, D., Zerefos, C., and Blumthaler, M.: Correcting global solar ultraviolet spectra recorded by a Brewer spectroradiometer for its angular response error, Appl. Optics, 37, 6339–6344, 1998.; 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.; Bais, A G., Gardiner, B G., Slaper, H., Slaper, H., Blumthaler, M., Bernhard, G., McKenzie, R., Webb, A R., Seckmeyer, G., Kjeldstad, B., Koskela, T., Kirsch, P J., Gröbner, J., Kerr, J B., Kazadzis, S., Leszczynski, K., Wardle, D., Brogniez, C., Josefsson, W., Gillotay, D., Reinen, H., Weihs, P., Svenœ, T., Eriksen, P., Kuik, F., and Redondas, A.: The SUSPEN intercomparison of ultraviolet spectroradiometers, J. Geophys. Res., 106, 12 509–12 525, 2001.; Bernhard, G. and Seckmeyer, G.: Uncertainty of measurements of spectral solar UV irradiance, J. Geophys. Res., 104, 14 321–14 345, 1999.; Bernhard, G., Booth, C R., and Ehramjian, J C.: Version 2 data of the National Science Foundation���s Ultraviolet Radiation Monitoring Network: South Pole, J. Geophys. Res., 109, \doi10.1029/2004JD005584, 2004.; Bernhard, G., Booth, C R., and Ehramjian, J C.: Real-time ultraviolet and column ozone from multichannel ultraviolet radiometers deployed in the National Science Foundation���s ultraviolet monitoring network, Opt. Eng., 44, 041011, doi:10.117/1.1887195, 2005.; Blumthaler, M.: Quality assurance and quality control methodologies used within the Austrian UV monitoring network, Radiation Protection Dosimetry, 111, 359–362, \doi10.1093/rpd/nch054, 2004.; Booth, C., Lucas, T., and Morrow, J.: High resolution UV spectral irradiance monitoring program in polar regions: Five years (and growing) of data available to polar research in ozone- and ultraviolet -related studies, Antarct. J. U. S., 338–341, 1992.; Booth, C., Bernhard, G., Ehramjian, E.C. nad~Quang, V., and Lynch, S.: NSF Polar Programs UV Spectroradiometer Network 1999-2000 Operations Report, Tech. rep., Biospherical Instruments Inc., san Diego, 219 pp., 2001.; Cappellani, F. and Kochler, C.: Temperature effects correction in a Brewer MKIV spectrophotometer for solar UV measurements, J. Geophys. Res., 105, 4829–4831, 1999.; De~Backer, H., Köpke, P., Bais, A., De~Cabo, X., Frej, T., Gillotay, D., Haite, C., Heikkilä, A., Kazantzidis, A., Koskela, T., Kyrö, E., Lapeta, B.and~Lorente, J., Masson, K., Mayer, B., Plets, H., Redondas, A., Renaud, A., Schauberger, G., Schmalwieser, A., and Vaniceck, K.: Comparison of measured and modelled UV indices for the assessment of health risks, Meteorol. Appl., 8, 267–277, 2001.; Feister, U., Grewe, R., and Gericke, K.: A method for correction of cosine errors in measurements of spectral UV irradiance, Sol. Energy, 60, 313–332, 1997.

 
 



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