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000807643 1001_ $$0P:(DE-Juel1)2693$$aBohn, Birger$$b0$$eCorresponding author$$ufzj
000807643 245__ $$aCharacterisation and improvement of j(O1D) filter radiometers
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000807643 520__ $$aAtmospheric O3 →  O(1D) photolysis frequencies j(O1D) are crucial parameters for atmospheric photochemistry because of their importance for primary OH formation. Filter radiometers have been used for many years for in situ field measurements of j(O1D). Typically the relationship between the output of the instruments and j(O1D) is non-linear because of changes in the shape of the solar spectrum dependent on solar zenith angles and total ozone columns. These non-linearities can be compensated for by a correction method based on laboratory measurements of the spectral sensitivity of the filter radiometer and simulated solar actinic flux density spectra. Although this correction is routinely applied, the results of a previous field comparison study of several filter radiometers revealed that some corrections were inadequate. In this work the spectral characterisations of seven instruments were revised, and the correction procedures were updated and harmonised considering recent recommendations of absorption cross sections and quantum yields of the photolysis process O3 →  O(1D). Previous inconsistencies were largely removed using these procedures. In addition, optical interference filters were replaced to improve the spectral properties of the instruments. Successive determinations of spectral sensitivities and field comparisons of the modified instruments with a spectroradiometer reference confirmed the improved performance. Overall, filter radiometers remain a low-maintenance alternative of spectroradiometers for accurate measurements of j(O1D) provided their spectral properties are known and potential drifts in sensitivities are monitored by regular calibrations with standard lamps or reference instruments.
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000807643 7001_ $$0P:(DE-HGF)0$$aHeard, Dwayne E.$$b1
000807643 7001_ $$0P:(DE-HGF)0$$aMihalopoulos, Nikolaos$$b2
000807643 7001_ $$0P:(DE-HGF)0$$aPlass-Dülmer, Christian$$b3
000807643 7001_ $$0P:(DE-HGF)0$$aSchmitt, Rainer$$b4
000807643 7001_ $$0P:(DE-HGF)0$$aWhalley, Lisa K.$$b5
000807643 773__ $$0PERI:(DE-600)2505596-3$$a10.5194/amt-9-3455-2016$$gp. 1 - 25$$p3455-3466$$tAtmospheric measurement techniques$$v9$$x1867-1381$$y2016
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