Elemental carbon (EC) and black carbon (BC) measurements with a thermal method and an aethalometer at the high-alpine research station Jungfraujoch |
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| Affiliation: | 1. Department of Chemistry and Biochemistry, University of Berne, CH-3012 Berne, Switzerland;2. Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland;1. Collaborative Innovation Centre on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing, China;2. Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing, China;3. Key Laboratory of Meteorological Disaster, Ministry of Education (KLME), Nanjing University of Information Science & Technology, Nanjing, China;4. Joint International Research Laboratory of Climate and Environment Change (ILCEC), Nanjing University of Information Science & Technology, Nanjing, China;1. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, USA;2. University of Wisconsin-Madison, Madison, WI, USA;3. School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, USA;1. CzechGlobe - Global Change Research Institute CAS, Brno, 60300, Czech Republic;2. Institute of Chemical Process Fundamentals CAS, Prague, CZ18000, Czech Republic;3. Czech Hydrometeorological Institute, Košetice Observatory, Košetice, 394 22, Czech Republic;4. Institute for Environmental Studies, Faculty of Science, Charles University, Prague, 128 01, Czech Republic;5. Research Centre for Toxic Compounds in the Environment, Masaryk University, Brno, 62500, Czech Republic |
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| Abstract: | A thermal method for the determination of ambient organic carbon (OC) and elemental carbon (EC) concentrations in carbonaceous samples was further developed. Possible artifacts were investigated and were shown to be low. Good agreement of EC data with the German VDI reference method was found and detection limits were 1.3 μg for EC and 1.8 μg for OC. The method was applied to samples obtained with an aethalometer from an ongoing campaign at the high-alpine research station Jungfraujoch from July 1995 to June 1997. Measurements of EC concentration were used to derive a new site-specific calibration factor (instrumental absorption efficiency αAPI) for the determination of the black carbon (BC) concentration. Despite a distinct seasonal cycle in BC, of around one order in magnitude with a maximum in summer and minimum in winter, αAPI exhibited no significant seasonality. The derived calibration factor for the Jungfraujoch, αAPI=9.3±0.4 m2 g-1, is lower than the manufacturer calibration by a factor ∼2. The results confirm the observation that the aethalometer determined BC concentration, underestimates the true value at remote sites, when the manufacturer calibration is used. |
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