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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2018-445
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2018-445
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 16 Jan 2019

Submitted as: research article | 16 Jan 2019

Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Measurement Techniques (AMT) and is expected to appear here in due course.

Methods for identifying aged ship plumes and estimating contribution to aerosol exposure downwind of shipping lanes

Stina Ausmeel1, Axel Eriksson1,2, Erik Ahlberg1, and Adam Kristensson1 Stina Ausmeel et al.
  • 1Division of Nuclear Physics, Lund University, Lund, Box 118, 221 00, Sweden
  • 2Ergonomics and Aerosol Technology, Lund University, Lund, Box 118, 221 00, Sweden

Abstract. Ship traffic is a major source of aerosol particles, particularly near shipping lanes and harbours. In order to estimate the contribution to exposure downwind of a shipping lane, it is important to be able to measure the ship emission contribution at various distances from the source. We report on measurements of atmospheric particles, 7–20 km downwind of a shipping lane in the Baltic Sea Sulphur Emission Control Area (SECA) at a coastal location in southern Sweden during a winter and a summer campaign. Each ship plume was linked to individual ship passages using a novel method based on wind field data and Automatic ship Identification System data (AIS), where varying wind speeds and directions were applied to calculate a plume trajectory. In a situation where AIS data is not matching measured plumes well or if AIS data is missing, we provide an alternative method with particle number concentration data. The shipping lane contribution to the particle number concentration in Falsterbo was estimated by subtracting background concentrations from the ship plume concentrations, and more than 150 plumes were analysed. We have also extrapolated the contribution to seasonal averages and provide recommendations for future similar measurements. Averaged over a season, the contribution to particle number concentration was about 18 % during the winter and 10 % during the summer, including those periods with wind directions when the shipping lane was not affecting the station. The corresponding contribution to equivalent black carbon was 1.4 %.

Stina Ausmeel et al.
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Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Stina Ausmeel et al.
Stina Ausmeel et al.
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Short summary
We present a method for identifying individual exhaust plumes of air pollution emitted from shipping, by linking these to specific ships using identification information which all ships transmit. We also quantify the contribution of these plumes to local particle levels, which has relevance for e.g. health effects. Ships emit a lot of nanometre sized particles which proved to be a good indicator of plumes at a distance of about 10 kilometres downwind of a shipping lane in the Baltic Sea.
We present a method for identifying individual exhaust plumes of air pollution emitted from...
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