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| Titel |
Constrained two-stream algorithm for calculating aerosol light absorption coefficient from the Particle Soot Absorption Photometer |
| VerfasserIn |
T. Müller, A. Virkkula, J. A. Ogren |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 12 ; Nr. 7, no. 12 (2014-12-02), S.4049-4070 |
| Datensatznummer |
250115970
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| Publikation (Nr.) |
 copernicus.org/amt-7-4049-2014.pdf |
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| Zusammenfassung |
| We present a new correction scheme for filter-based absorption photometers
based on a constrained two-stream (CTS) radiative transfer model and
experimental calibrations. The two-stream model was initialized using
experimentally accessible optical parameters of the filter. Experimental
calibrations were taken from the literature and from dedicated experiments for
the present manuscript. Uncertainties in the model and calibration
experiments are discussed and uncertainties for retrieval of absorption
coefficients are derived. For single-scattering albedos lower than 0.8, the
new CTS method and also other correction schemes suffer from the uncertainty
in calibration experiments, with an uncertainty of about 20% in the
absorption coefficient. For high single-scattering albedos, the CTS correction
significantly reduces errors. At a single-scattering albedo of about 0.98 the
error can be reduced to 30%, whereas errors using the Bond correction
(Bond et al., 1999) are up to 100%. The correction scheme was tested
using data from an independent experiment. The tests confirm the modeled
performance of the correction scheme when comparing the CTS method to other established
correction methods. |
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