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| Titel |
NO2 and HCHO photolysis frequencies from irradiance measurements in Thessaloniki, Greece |
| VerfasserIn |
C. Topaloglou, S. Kazadzis, A. F. Bais, M. Blumthaler, B. Schallhart, D. Balis |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 5, no. 6 ; Nr. 5, no. 6 (2005-06-29), S.1645-1653 |
| Datensatznummer |
250002911
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| Publikation (Nr.) |
 copernicus.org/acp-5-1645-2005.pdf |
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| Zusammenfassung |
| An empirical approach for the retrieval of nitrogen dioxide (NO2) and
formaldehyde (HCHO) photolysis frequencies from measurements of global
irradiance is presented in this work. Four months of synchronous
measurements of actinic flux and global irradiance performed in
Thessaloniki, Greece by a Bentham spectroradiometer were used to extract
polynomials for the conversion of global irradiance to photolysis
frequencies [J(NO2) and J(HCHO)]. The comparison of these photolysis
frequency values to the corresponding values calculated by spectral actinic
flux measurements, showed a ratio very close to unity for all J's with a
standard deviation of 12% (2σ) for J(NO2) and 6%
(2σ) for J(HCHO). Additional sets of polynomials were also extracted
to allow determination of J(NO2) by spectroradiometers with lower upper
wavelength limits such as single and double Brewer spectroradiometers within
acceptable uncertainty (corresponding ratio was 1 and standard deviation was
12% (2σ) for the method that can be used with double Brewers and
20% for the method that can be used for single Brewers). The validity of
the method under different atmospheric conditions was also examined by
applying the polynomials to another set of actinic flux and global
irradiance measurements performed in May 2004, in Buchhofen, Germany. In
this case, comparing J values extracted from the polynomials to those
calculated from actinic flux, showed equivalent results, demonstrating that
the method can also be applied to other measurement sites. |
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