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

By Lakkala, K.

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
Citation APA MLA Chicago 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://www.gutenberg.us/

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
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