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

Ausmeel, Stina LU ; Eriksson, Axel LU ; Ahlberg, Erik LU and Kristensson, Adam LU (2019) In Atmospheric Measurement Techniques 12(8). p.4479-4493
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 Sulfur 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... (More)

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 Sulfur 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 are not matching measured plumes well or if AIS data are 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 %.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Atmospheric Measurement Techniques
volume
12
issue
8
pages
15 pages
publisher
Copernicus Gesellschaft mbH
external identifiers
  • scopus:85071275500
ISSN
1867-1381
DOI
10.5194/amt-12-4479-2019
language
English
LU publication?
yes
id
ec71a671-9ac4-440c-9e1e-652c0e8bade9
date added to LUP
2019-09-09 15:07:58
date last changed
2019-10-01 03:46:58
@article{ec71a671-9ac4-440c-9e1e-652c0e8bade9,
  abstract     = {<p/><p>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&amp;thinsp;km downwind of a shipping lane in the Baltic Sea Sulfur 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 are not matching measured plumes well or if AIS data are 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&amp;thinsp;% during the winter and 10&amp;thinsp;% 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&amp;thinsp;%.</p>.},
  author       = {Ausmeel, Stina and Eriksson, Axel and Ahlberg, Erik and Kristensson, Adam},
  issn         = {1867-1381},
  language     = {eng},
  number       = {8},
  pages        = {4479--4493},
  publisher    = {Copernicus Gesellschaft mbH},
  series       = {Atmospheric Measurement Techniques},
  title        = {Methods for identifying aged ship plumes and estimating contribution to aerosol exposure downwind of shipping lanes},
  url          = {http://dx.doi.org/10.5194/amt-12-4479-2019},
  volume       = {12},
  year         = {2019},
}