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Modeling of the Concentrations of Ultrafine Particles in the Plumes of Ships in the Vicinity of Major Harbors

Author

Listed:
  • Matthias Karl

    (Chemistry Transport Modelling, Helmholtz Zentrum Geesthacht, 21502 Geesthacht, Germany)

  • Liisa Pirjola

    (Department of Technology, Metropolia University of Applied Sciences, P.O. Box 4071, FI-01600 Vantaa, Finland
    Department of Physics, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland)

  • Ari Karppinen

    (Atmospheric Composition Research, Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland)

  • Jukka-Pekka Jalkanen

    (Atmospheric Composition Research, Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland)

  • Martin Otto Paul Ramacher

    (Chemistry Transport Modelling, Helmholtz Zentrum Geesthacht, 21502 Geesthacht, Germany)

  • Jaakko Kukkonen

    (Atmospheric Composition Research, Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland)

Abstract

Marine traffic in harbors can be responsible for significant atmospheric concentrations of ultrafine particles (UFPs), which have widely recognized negative effects on human health. It is therefore essential to model and measure the time evolution of the number size distributions and chemical composition of UFPs in ship exhaust to assess the resulting exposure in the vicinity of shipping routes. In this study, a sequential modelling chain was developed and applied, in combination with the data measured and collected in major harbor areas in the cities of Helsinki and Turku in Finland, during winter and summer in 2010–2011. The models described ship emissions, atmospheric dispersion, and aerosol dynamics, complemented with a time–microenvironment–activity model to estimate the short-term UFP exposure. We estimated the dilution ratio during the initial fast expansion of the exhaust plume to be approximately equal to eight. This dispersion regime resulted in a fully formed nucleation mode (denoted as Nuc 2 ). Different selected modelling assumptions about the chemical composition of Nuc 2 did not have an effect on the formation of nucleation mode particles. Aerosol model simulations of the dispersing ship plume also revealed a partially formed nucleation mode (Nuc 1 ; peaking at 1.5 nm), consisting of freshly nucleated sulfate particles and condensed organics that were produced within the first few seconds. However, subsequent growth of the new particles was limited, due to efficient scavenging by the larger particles originating from the ship exhaust. The transport of UFPs downwind of the ship track increased the hourly mean UFP concentrations in the neighboring residential areas by a factor of two or more up to a distance of 3600 m, compared with the corresponding UFP concentrations in the urban background. The substantially increased UFP concentrations due to ship traffic significantly affected the daily mean exposures in residential areas located in the vicinity of the harbors.

Suggested Citation

  • Matthias Karl & Liisa Pirjola & Ari Karppinen & Jukka-Pekka Jalkanen & Martin Otto Paul Ramacher & Jaakko Kukkonen, 2020. "Modeling of the Concentrations of Ultrafine Particles in the Plumes of Ships in the Vicinity of Major Harbors," IJERPH, MDPI, vol. 17(3), pages 1-24, January.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:3:p:777-:d:313261
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    References listed on IDEAS

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    1. Filipe Batista e Silva & Hugo Poelman, 2016. "Mapping population density in Functional Urban Areas - A method to downscale population statistics to Urban Atlas polygons," JRC Research Reports JRC103756, Joint Research Centre.
    2. Kevin Capaldo & James J. Corbett & Prasad Kasibhatla & Paul Fischbeck & Spyros N. Pandis, 1999. "Effects of ship emissions on sulphur cycling and radiative climate forcing over the ocean," Nature, Nature, vol. 400(6746), pages 743-746, August.
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