Journal
OCEANOLOGIA
Volume 58, Issue 1, Pages 1-12Publisher
POLISH ACAD SCIENCES INST OCEANOLOGY
DOI: 10.1016/j.oceano.2015.08.001
Keywords
Ship emission; Particle number size distribution; Absorption Angstrom exponent
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Funding
- Promotion of Student Scientific Activities from Research Council of Lithuania [VP1-3.1-SMM-01-V-02-003]
- Republic of Lithuania
- European Social Fund under Human Resources Development Operational Programme's priority 3
- NordForsk through top-level initiative Cryosphere-atmosphere interactions in changing Arctic climate (CRAICC)
- Swedish Research Council Formas [2010-850]
- ACTRIS (Aerosols, Clouds, and Trace gases Research InfraStructure Network) [262254, EU FP7-INFRASTRUCTURES-2010-1]
- German Federal Environmental Agency (WBA-WCCAP) [FKZ 35101086]
- European Union Seventh Framework Programme [262254]
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In this study, we evaluated 10 months data (September 2009 to June 2010) of atmospheric aerosol particle number size distribution at three atmospheric observation stations along the Baltic Sea coast: Vavihill (upwind, Sweden), Uto (upwind, Finland), and Preila (downwind, Lithuania). Differences in aerosol particle number size distributions between the upwind and downwind stations during situations of connected atmospheric flow, when the air passed each station, were used to assess the contribution of ship emissions to the aerosol number concentration (diameter interval 50-400 nm) in the Lithuanian background coastal environment. A clear increase in particle number concentration could be noticed, by a factor of 1.9 from Uto to Preila (the average total number concentration at Uto was 791 cm(-3)), and by a factor of 1.6 from Vavihill to Preila (the average total number concentration at Vavihill was 998 cm(-3)). The simultaneous measurements of absorption Angstrom exponents close to unity at Preila supported our conclusion that ship emissions in the Baltic Sea contributed to the increase in particle number concentration at Preila. (C) 2015 Institute of Oceanology of the Polish Academy of Sciences.
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