Characterization and intercomparison of aerosol absorption photometers: result of two intercomparison workshops
Thomas Müller,J. S. Henzing,G. de Leeuw,G. de Leeuw,G. de Leeuw,A. Wiedensohler,Andrés Alastuey,Hristo Angelov,M. Bizjak,M. Collaud Coen,J. E. Engström,Carsten Gruening,Risto Hillamo,András Hoffer,Kornélia Imre,P. Ivanow,G. Jennings,Junying Sun,Nikos Kalivitis,H. Karlsson,Mika Komppula,Paolo Laj,Paolo Laj,Shao-Meng Li,Chris Rene Lunder,Angela Marinoni,S. Martins dos Santos,Marcel M. Moerman,Andreas Nowak,John A. Ogren,Andreas Petzold,Jean-Marc Pichon,S. Rodriquez,S. Rodriquez,Sangeeta Sharma,Patrick J. Sheridan,Kimmo Teinilä,Thomas Tuch,Mar Viana,Aki Virkkula,Ernest Weingartner,R. Wilhelm,Yang Wang +42 more
TLDR
In this paper, the authors compared the performance of different types of absorption photometers for real-time analysis of aerosol particles. But, the results showed that the current corrections of a cross sensitivity to particle scattering are not sufficient and the remaining cross sensitivities were a function of the total particle load on the filter.Abstract:
. 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.read more
Citations
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Recommendations for reporting "black carbon" measurements
Andreas Petzold,John A. Ogren,Markus Fiebig,P. Laj,Shao-Meng Li,Urs Baltensperger,Thomas Holzer-Popp,Stefan Kinne,Gelsomina Pappalardo,Nobuo Sugimoto,Christoph Wehrli,Alfred Wiedensohler,Xiaoye Zhang +12 more
TL;DR: In this article, the authors present a recommended terminology to clarify the terms used for black carbon in atmospheric research, with the goal of establishing unambiguous links between terms, targeted material properties and associated measurement techniques.
Journal ArticleDOI
The "dual-spot" Aethalometer: an improved measurement of aerosol black carbon with real-time loading compensation
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TL;DR: In this article, a real-time loading effect compensation algorithm based on a two parallel spot measurement of optical absorption is proposed for the Aethalometer model AE33, which provides the high-quality data necessary for realtime source apportionment and for determination of the temporal variation of the compensation parameter k.
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New considerations for PM, Black Carbon and particle number concentration for air quality monitoring across different European cities
Cristina Reche,Cristina Reche,Xavier Querol,Andrés Alastuey,Mar Viana,Jorge Pey,Teresa Moreno,Sergio Rodríguez,Yenny González,R. Fernández-Camacho,J. de la Rosa,Manuel Dall'Osto,André S. H. Prévôt,Christoph Hueglin,Roy M. Harrison,Paul Quincey +15 more
TL;DR: In this paper, the results of the interpretation of the 2009 variability of levels of PM, Black Carbon (BC), aerosol number concentration (N) and a number of gaseous pollu- tants in seven selected urban areas covering road traffic, ur- ban background, urban-industrial, and urban-shipping envi- ronments from southern, central and northern Europe.
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Optical properties of secondary organic aerosols and their changes by chemical processes.
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Soot Reference Materials for instrument calibration and intercomparisons: a workshop summary with recommendations
Darrel Baumgardner,Olga Popovicheva,James Allan,V. Bernardoni,Junji Cao,Fabrizia Cavalli,J. Cozic,Evangelia Diapouli,Konstantinos Eleftheriadis,P. J. Genberg,C. Gonzalez,Martin Gysel,A. John,Thomas W. Kirchstetter,Thomas A. J. Kuhlbusch,M. Laborde,Daniel A. Lack,Daniel A. Lack,Thomas Müller,Reinhard Niessner,Andreas Petzold,Andrea Piazzalunga,J. P. Putaud,Joshua P. Schwarz,Joshua P. Schwarz,Patrick J. Sheridan,R. Subramanian,Erik Swietlicki,Gianluigi Valli,Roberta Vecchi,Mar Viana +30 more
TL;DR: In this paper, the current state of availability and practicability of soot standard reference materials (SRMs) was reviewed by a group of 50 international experts during a workshop in June 2011.
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