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| Titel |
Contribution of ship traffic to aerosol particle concentrations downwind of a major shipping lane |
| VerfasserIn |
N. Kivekäs, A. Maßling, H. Grythe, R. Lange, V. Rusnak, S. Carreno, H. Skov, E. Swietlicki, Q. T. Nguyen, M. Glasius, A. Kristensson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 16 ; Nr. 14, no. 16 (2014-08-19), S.8255-8267 |
| Datensatznummer |
250118954
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| Publikation (Nr.) |
 copernicus.org/acp-14-8255-2014.pdf |
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| Zusammenfassung |
| Particles in the atmosphere are of concern due to their toxic properties and
effects on climate. In coastal areas, ship emissions can be a significant
anthropogenic source. In this study we investigated the contribution from
ship emissions to the total particle number and mass concentrations at a
remote location. We studied the particle number concentration (12 to 490 nm
in diameter), the mass concentration (12 to 150 nm in diameter) and number
and volume size distribution of aerosol particles in ship plumes for a
period of 4.5 months at Høvsøre, a coastal site on the
western coast of Jutland in Denmark. During episodes of western winds, the
site is about 50 km downwind of a major shipping lane and the plumes are
approximately 1 hour old when they arrive at the site. We have used a
sliding percentile-based method for separating the plumes from the measured
background values and to calculate the ship plume contribution to the total
particle number and PM0.15 mass concentration (mass of particles below
150 nm in diameter, converted from volume assuming sphericity) at the site.
The method is not limited to particle number or volume concentration, but
can also be used for different chemical species in both particle and gas
phase. The total number of analyzed ship plumes was 726, covering on average
19% of the time when air masses were arriving at the site over the
shipping lane. During the periods when plumes were present, the particle
concentration exceeded the background values on average by 790 cm−3 by
number and 0.10 μg m−3 by mass. The corresponding daily average
values were 170 cm−3 and 0.023 μg m−3, respectively. This
means that the ship plumes contributed between 11 and 19% to the particle
number concentration and between 9 and 18% to PM0.15 during days
when air was arriving over the shipping lane. The estimated annual
contribution from ship plumes, where all wind directions were included, was
in the range of 5–8% in particle number concentration and 4–8% in
PM0.15. |
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