Print Email Facebook Twitter Visibility in the Netherlands during New Year's fireworks: The role of soot and salty aerosol products Title Visibility in the Netherlands during New Year's fireworks: The role of soot and salty aerosol products Author ten Brink, H. Henzing, B. Otjes, R. Weijers, E. Publication year 2018 Abstract The visibility on New Year's nights in the Netherlands is low during stagnant weather. This is due to the scattering and absorption of light by the aerosol-smoke from the fireworks. We made an assessment of the responsible aerosol-species. The investigation took place during the New Year's night of 2009. Measurements were made at a regional site in the centre of the country away from specific local sources. An Integrating Nephelometer measured the light-scattering by the inherent compounds after removal of water from the aerosol by drying the air. The actual light-scattering was determined in an open-air scatterometer; it was a factor of five higher than the “dry” value. The difference in actual and “dry” light-scattering can only be explained by water–uptake of the salty hygroscopic components of the aerosol. This hypothesis is substantiated by measurements of the composition of the aerosol. The size-dependent concentrations of the salty ionic species were determined on-line with a MARGA-“sizer”. These components were for a large part in particles in the size range that most effectively scatter light. The “dry” light-scattering was exerted by the inorganic salt components and the sooty carbonaceous material alike. However, the salty products from the fireworks are hygroscopic and take up water at the high relative humidities occurring that night. This explains the fivefold larger light-scattering by the wet ambient aerosol as compared to that by the dry aerosol in the integrating nephelometer. The visibility, which is the inverse of the open-air scattering, is thus indirectly governed by the salty products of the fireworks due to their uptake of water. Under stagnant weather conditions during New Year's nights in the Netherlands both the aerosol concentrations and the relative humidity are high; this implies that the ionic species govern the low visibilities in general, be it via their uptake of water. © 2017 Elsevier Ltd Chemicals/CAS: water, 7732-18-5 Subject 2015 Urban Mobility & EnvironmentCAS - Climate, Air and SustainabilityELSS - Earth, Life and Social SciencesEnvironment & SustainabilityEnvironmentUrbanisationFireworksHygroscopicityMARGA-sizerPotassiumVisibility To reference this document use: http://resolver.tudelft.nl/uuid:09ad58d6-3e8b-4676-b2c6-657e77a285e1 DOI https://doi.org/10.1016/j.atmosenv.2017.11.020 TNO identifier 782483 ISSN 1352-2310 Source Atmospheric Environment, 173, 289-294 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.