Characteristics of black carbon aerosol mass concentration over the East Baltic region from two-year measurements
Typical periodicities caused by anthropogenic and meteorological influences have been identified using Fourier analysis. It was shown that domestic heating appears as a 365 day periodicity; traffic slightly contributes 5-7 day peaks in the spectrum and elevated long-range BC can be identified as cha...
| Published in: | Journal of Environmental Monitoring |
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| Main Authors: | , , |
| Format: | Article in Journal/Newspaper |
| Language: | Lithuanian English |
| Published: |
2011
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| Subjects: | |
| Online Access: | http://ftmc.lvb.lt/FTMC:ELABAPDB6226967&prefLang=en_US |
| Summary: | Typical periodicities caused by anthropogenic and meteorological influences have been identified using Fourier analysis. It was shown that domestic heating appears as a 365 day periodicity; traffic slightly contributes 5-7 day peaks in the spectrum and elevated long-range BC can be identified as characteristic peaks with periodicities in the range from 16 to 29 days. Temporal evolution and transport of BC aerosols were interpreted by the air mass backward trajectory analysis in conjunction with the examination of the wavelength dependence on the aethalometer data. Air masses originated from the North Atlantic Ocean and Scandinavia were favourable for lower BC concentrations (350 ng m 3), while the BC level associated with the Western Europe airflows was significantly higher (970 ng m -3). The mean values of Angstrom exponent of the absorption coefficient (monthly means 1.45 +- 0.25 and 0.84 +- 0.50 over January and June, respectively) revealed that the BC concentration observed over the East Baltic is influenced by submicron sized particles as a result of incomplete biomass combustion during the winter season. |
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