Size-segregated measurements of particulate elemental carbon and aerosol light absorption at remote arctic locations |
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| Affiliation: | 1. S.D. Ingeniería Química, Universidad Autónoma de Madrid, Av/ Francisco Tomás y Valiente 7, 28049 Madrid, Spain;2. John and Willie Leone Family Department of Energy and Mineral Engineering and EMS Energy Institute, The Pennsylvania State University, 114A Hosler Building, University Park, PA 16802, United States;1. Indian Institute of Astrophysics, 2nd Block Koramangala, Bangalore, Karnataka 560034, India;2. Indian Institute of Tropical Meteorology, (New Delhi Branch) Prof. Ram Nath Vij Marg,New Delhi 110060, India;3. School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea;4. Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO 80309, USA;1. State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;2. The National Center for Nanoscience and Technology, Beijing 100084, China;1. Dostoevsky Omsk State University, Omsk 644077, Russia;2. Omsk Scientific Center SB RAS, Omsk 644024, Russia;3. Institute of Hydrocarbon Processing SB RAS, Omsk 644040, Russia;1. Dept. of Physics, University of Genoa & INFN, Via Dodecaneso 33, 16146, Genova, Italy;2. Dept. of Physics, Università degli Studi di Milano & INFN, Via Celoria 16, 20133, Milano, Italy;3. Dept. of Physics, University of Florence, Via Sansone 1, 50019, Sesto Fiorentino, FI, Italy;4. INFN – Section of Florence, Via Sansone 1, 50019, Sesto Fiorentino, FI, Italy;5. Dept. of Chemistry, Università degli Studi di Milano, Via Golgi 19, 20133, Milano, Italy;6. Dept. of Environmental and Territorial Sciences, Università degli Studi di Milano-Bicocca, Piazza della Scienza 1, 20122 Milan, Italy |
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| Abstract: | Size-segregated aerosol samples were taken during 2 winter pollution periods and in clean summer air at different remote locations in the European Arctic > 74°N. By means of a newly developed integrating sphere photometer these filter samples have been analysed for aerosol light absorption coefficients and particulate elemental carbon (PEC). The relatively high PEC concentrations in winter confirm other findings about the Arctic winter atmosphere having an aged continental aerosol burden. In summer very low light absorption coefficients of 4.5 × 10−8 m−1 were measured, similar to upper tropospheric background values. For the climatically important months of March-May the key optical aerosol properties (extinction coefficient, single scattering albedo and absorption to backscatter ratio) were determined. Based on the approach of J.M. Mitchell (1971, in Man's Impact on Climate. MIT Press, Cambridge, MA) the Arctic haze aerosol is found to contribute to atmospheric heating, even in the summer. A first PEC size distribution was determined in a clean polar summer air. The results show systematic variations in the PEC size distribution from urban to remote locations and seasonal variations in the sink region which may be exploited to quantify aerosol removal process in long distance transport studies. |
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