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| Titel |
Characterization and intercomparison of aerosol absorption photometers: result of two intercomparison workshops |
| VerfasserIn |
T. Müller, J. S. Henzing, G. Leeuw, A. Wiedensohler, A. Alastuey, H. Angelov, M. Bizjak, M. Collaud Coen, J. E. Engström, C. Gruening, R. Hillamo, A. Hoffer, K. Imre, P. Ivanow, G. Jennings, J. Y. Sun, N. Kalivitis, H. Karlsson, M. Komppula, P. Laj, S.-M. Li, C. Lunder, A. Marinoni, S. Martins dos Santos, M. Moerman, A. Nowak, J. A. Ogren, A. Petzold, J. M. Pichon, S. Rodriquez, S. Sharma, P. J. Sheridan, K. Teinilä, T. Tuch, M. Viana, A. Virkkula, E. Weingärtner, R. Wilhelm, Y. Q. Wang |
| 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 ; 4, no. 2 ; Nr. 4, no. 2 (2011-02-10), S.245-268 |
| Datensatznummer |
250001673
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| Publikation (Nr.) |
 copernicus.org/amt-4-245-2011.pdf |
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| Zusammenfassung |
| Absorption photometers for real time application have been available since
the 1980s, but the use of filter-based instruments to derive information on
aerosol properties (absorption coefficient and black carbon, BC) is still a
matter of debate. Several workshops have been conducted to investigate the
performance of individual instruments over the intervening years. Two
workshops with large sets of aerosol absorption photometers were conducted
in 2005 and 2007. The data from these instruments were corrected using
existing methods before further analysis. The inter-comparison shows a large
variation between the responses to absorbing aerosol particles for different
types of instruments. The unit to unit variability between instruments can
be up to 30% for Particle Soot Absorption Photometers (PSAPs) and
Aethalometers. Multi Angle Absorption Photometers (MAAPs) showed a
variability of less than 5%. Reasons for the high variability were
identified to be variations in sample flow and spot size. It was observed
that different flow rates influence system performance with respect to
response to absorption and instrumental noise. Measurements with non
absorbing particles showed that the current corrections of a cross
sensitivity to particle scattering are not sufficient. Remaining cross
sensitivities were found to be a function of the total particle load on the
filter. The large variation between the response to absorbing aerosol
particles for different types of instruments indicates that current
correction functions for absorption photometers are not adequate. |
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