Atmospheric Measurement Techniques Discussions www.atmos-meas-tech-discuss.net 1867-8610 3 2 2010 10.5194/amtd-3-1511-2010 http://www.atmos-meas-tech-discuss.net/3/1511/2010/ http://www.atmos-meas-tech-discuss.net/3/1511/2010/amtd-3-1511-2010.html http://www.atmos-meas-tech-discuss.net/3/1511/2010/amtd-3-1511-2010.pdf 1511 1582 2010-04-07 Characterization and intercomparison of aerosol absorption photometers: result of two intercomparison workshops T. Müller J. S. Henzing G. de 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. Weingartner R. Wilhelm Y. Q. Wang Leibniz Institute for Tropospheric Research, Leipzig, Germany Netherlands Organisation for Applied Scientific Research, TNO, 80015 Utrecht, The Netherlands Finnish Meteorological Institute (FMI), Climate Change Unit, Helsinki, Finland Finnish Meteorological Institute, Air Quality Research, Helsinki, Finland Finnish Meteorological Institute (FMI), Kuopio Unit, Kuopio, Finland University of Helsinki, Dept of Physics, Helsinki, Finland Institute for Environmental Assessment and Water Research (IDAEA-CSIC), Barcelona, Spain Institute for Nuclear Research and Nuclear Energy (INRNE), Bulgarian Academy of Sciences University of Ljubljana, Faculty of Health Science, Ljubljana, Slovenia MeteoSwiss, Aerological Station, Les Invuardes, 1530 Payerne, Switzerland University of Stockholm, Department of Meteorology, Stockholm, Sweden European Commission – DG Joint Research Centre, IES/CCU, Ispra, Italy Department of Earth and Environmental Sciences, University of Pannonia, P.O. Box 158, 8201 Veszprém, Hungary National University of Ireland, Galway, School of Physics/Environmental Change Institute, Galway, Ireland Key Laboratory for Atmospheric Chemistry, Center for Atmosphere Watch and Services, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081, China Nikos Kalivitis, Environmental Chemical Processes Laboratory, Department of Chemistry, University of Crete, Greece Department of Applied Environmental Science(ITM), Stockholm University, Sweden CNRS/LaMP Université Blaise Pascal, 24, avenue des Landais, 63177 Aubière cedex, France Laboratoire de Glaciologie et Géophysique de l'Environnement Université Joseph Fourier, Grenoble 1/CNRS, 38400 St Martin d'Hères, France Air Quality Research Division, Science and Technology Branch, Environment Canada, 4905 Dufferin Street, Toronto, Ontario M3H 5T4, Canada Climate Research Division, Science and Technology Branch, Environment Canada, 4905 Dufferin Street, Toronto, Ontario M3H 5T4, Canada Norwegian Institute for Air Research (NILU), Kjeller, Norway Institute of Atmospheric Sciences and Climate (ISAC-CNR), Via Gobetti 101, 40129 Bologna, Italy European Commission - DG Joint Research Centre, IES/CCU, Ispra, Italy NOAA Earth System Research Laboratory, Boulder, CO 80305, USA Institute für Physik der Atmosphäre, DLR, Oberpfaffenhofen, 82234, Wessling, Germany Izaña Atmospheric Research Center, AEMET, Associated Unit to CSIC "Studies on Atmospheric Pollution", La Marina 20, planta 6, 38071, Santa Cruz de Tenerife, Canary Islands, Spain University of Huelva, Associated Unit to CSIC "Air Pollution", Campus El Carmen, 21071, Huelva, Spain Laboratory of Atmospheric Chemistry, Paul Scherrer Institut, Villigen, Switzerland German Weather Service, Meteorological Observatory Hohenpeißenberg, Department GAW, 82383 Hohenpeißenberg, Germany Centre for Atmosphere Watch and Services (CAWAS), Chinese Academy of Meteorological Sciences (CAMS), Beijing 100081, China 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. 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