Hauptseite > IEK > IEK-8 > Photolysis frequency measurement techniques: results of a comparison within the ACCENT project > print

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|a Meteorology & Atmospheric Sciences
100 1 _ |0 P:(DE-Juel1)2693
|a Bohn, B.
|b 0
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245 _ _ |a Photolysis frequency measurement techniques: results of a comparison within the ACCENT project
260 _ _ |a Katlenburg-Lindau
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|c 2008
300 _ _ |a 5373 - 5391
336 7 _ |a Journal Article
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440 _ 0 |0 9601
|a Atmospheric Chemistry and Physics
|v 8
|x 1680-7316
|y 17
500 _ _ |a Record converted from VDB: 12.11.2012
520 _ _ |a An intercomparison of different radiometric techniques measuring atmospheric photolysis frequencies j(NO2), j(HCHO) and j((OD)-D-1) was carried out in a two-week field campaign in June 2005 at Julich. Germany. Three double-monochromator based spectroradiometers (DM-SR), three single-monochromator based spectroradiometers with diode-array detectors (SM-SR) and seventeen filter radiometers (FR) (ten j(NO2))-FR, seven j((OD)-D-1)-FR) took part in this comparison. For j(NO2), all spectroradiometer results agreed within +/- 3%. For j(HCHO), agreement was slightly poorer between -8% and +4% of the DM-SR reference result. For the SM-SR deviations were explained by poorer spectral resolutions and lower accuracies caused by decreased sensitivities of the photodiode arrays in a wave-length range below 350 nm. For j((OD)-D-1), the results were more complex within +8% and -4% with increasing deviations towards larger solar zenith angles for the SM-SR. The direction and the magnitude of the deviations were dependent on the technique of background determination. All j(NO2))-FR showed good linearity with sing-le calibration factors being sufficient to convert from output voltages to j(NO2)). Measurements were feasible until sunset and comparison with previous calibrations showed good long-term stability. For the j((OD)-D-1)-FR, conversion from output voltages to j((OD)-D-1) needed calibration factors and correction functions considering the influences of total ozone column and elevation of the sun. All instruments showed good linearity at photolysis frequencies exceeding about 10% of maximum values. At larger solar zenith angles, the agreement was non-uniform with deviations explainable by insufficient correction functions. Comparison with previous calibrations for sonic J((OD)-D-1)-FR indicated drifts of calibration factors.
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|a Corlett, G.K.
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|a Gillmann, M.
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|a Sanghavi, S.
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|a Stange, G.
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|a Tensing, E.
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|a Vrekoussis, M.
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|a Bloss, W. J.
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|a Clapp, L.J.
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|a Kortner, M.
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|a Monks, P. S.
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|a Platt, U.
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|a Plass-Dülmer, C.
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|a Mihalopoulos, N.
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|a Heard, D. E.
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|a Clemitshaw, K. C.
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|a Meixner, F. X.
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|a Prevot, A. S. H.
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|a Schmitt, R.
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