Measurement of black carbon (BC) by an optical method and a thermal-optical method: Intercomparison for four sites |
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| Authors: | Tanveer Ahmed Vincent A Dutkiewicz Akhtar Shareef Gurdal Tuncel Semra Tuncel Liaquat Husain |
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| Institution: | 1. Department of Environmental Health Sciences, School of Public Health, State University of New York at Albany, Empire State Plaza, Albany, NY 12201-0509, USA;2. Wadsworth Center, New York State Department of Health, Empire State Plaza, Albany, NY, 12201-0509, USA;3. Middle East Technical University, Ankara, Turkey;1. Department of Analytical Chemistry, University of Extremadura, Av. de Elvas, s/n, Badajoz, 06006, Spain;2. Industrial Engineering School, University of Extremadura, Av. de Elvas, s/n, Badajoz, 06006, Spain;3. Department of Applied Physics, University of Extremadura, Av. de la Universidad, s/n, Cáceres, 10005, Spain;1. Univerisité Grenoble-Alpes, CNRS, Institut des Geosciences pour l’Environnement (IGE), Grenoble, France;2. Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen, CH-5232, Switzerland;3. Leibniz Institute for Tropospheric Research (TROPOS), Permoserstrasse 15, 04318, Leipzig, Germany;4. Atmospheric Science Unit, Department of Environmental Science and Analytical Chemistry (ACES), Stockholm University, Svante Arrhenius väg 8, SE-11418, Stockholm, Sweden;5. NILU-Norwegian Institute for Air Research, Kjeller, Norway;6. Environmental Chemistry Processes Laboratory, Dept. of Chemistry, University of Crete, 71003, Heraklion Crete, Greece;7. National Centre for Atmospheric Science, School of Geography, Earth and Environmental Sciences, University of Birmingham, B15 2TT, UK;8. Department of Environmental Sciences, Center of Excellence in Environmental Studies, King Abdulaziz University, PO Box 80203, Jeddah, 21589, Saudi Arabia;9. European Commission, Joint Research Centre (JRC), Directorate for Energy, Transport and Climate, Air and Climate Unit, Via E. Fermi 2749, I-21027 Ispra (VA), Italy;10. Institute of Environmental Assessment and Water Research (IDAEA-CSIC), c/ Jordi-Girona 18-26, ES08034, Barcelona, Spain;11. Laboratoire de Météorologie Physique, UMR 6016, CNRS/University of Clermont-Ferrand, Clermont-Ferrand, France;12. Division of Nuclear Physics, Department of Physics, Lund University, Lund, Sweden;13. Division of Atmospheric Science, Department of Physics, University of Helsinki, P.O. Box 64, FIN-00014, Helsinki, Finland;1. Department of Industrial Engineering, University of Trento, 38123 Trento, Italy;2. Brembo SpA, Stezzano, Italy;3. Department of Machine Design, KTH, Royal Institute of Technology, 100 44 Stockholm, Sweden;1. Institute for Advanced Sustainability Studies, Potsdam, Germany;2. Freie Universität Berlin, Fachbereich Geowissenschaften, Institut für Meteorologie, Berlin, Germany;3. CIRES, Boulder, USA;4. Paul Scherrer Institute, Villigen, Switzerland |
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| Abstract: | Comparison of black carbon (BC) measurements obtained by two methods was performed for aerosols samples collected on Whatman 41 (W-41) filters, using an optical method (Magee Scientific Optical Transmissometer Model OT-21) and a thermal-optical method (Sunset Laboratory Thermal-optical analyzer). Samples were collected from four sites: Albany (a small urban site, NY), Antalya (coastal site, Turkey), Whiteface Mountain (remote site, NY) and Mayville (rural site, NY). At Albany, comparison between the two methods showed excellent agreement; a least-squares regression line yielded a slope of 1.02, and r2 = 0.88. Similar comparisons at Antalya (slope of 1.02, r2 = 0.5) and Whiteface Mountain (slope of 0.92 and r2 = 0.58) also gave very good relationship. At Mayville, the relationship between the two methods yielded somewhat lower regression: a slope of 0.75, and r2 = 0.44. The data from the four locations, when plotted together, yielded an excellent agreement: a slope of 0.91, and r2 of 0.84. Based on our measurements, it appears that optical measurement using the OT-21 can be successfully applied to determination of BC in W-41 filters. However, because of the variability in the chemical composition of BC aerosol at different locations, it is suggested that the calibration of OT-21 when using W-41 filters should be performed with a statistically significant numbers of samples for specific sites. |
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