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Air Mass Characterisation During EOPACE: Aerosol Composition and Concentration

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The overall aim of this project is to characterise the aerosol physico-chemical properties for air masses found within the littoral zone for a wide range of conditions in order that their impact upon the propagation of visible and infra-red radiation may be quantified. The aerosol particles found within these air masses have a variety of sources, both natural and anthropogenic and are usually dominated by the accumulation mode particle radii from about 0.05 to 0.5 m. To this prevailing aerosol are added particles of more local origin which are generally larger, including surf-generated sea spray droplets which form the subject of companion investigations. The primary objective of the current work has been the characterisation of accumulation mode aerosol 0.05 r 1.5 m, within the littoral zone at a variety of locations. In order to achieve this objective, a thermal analytical, volatility technique has been utilised which is based on an Optical Particle Counter OPC. Simultaneous soot carbon loadings have been recorded using an aethalometer in order to validate the volatility measurements and simultaneously provide a useful indication of the magnitude of anthropogenic aerosol input into the measured air masses. During the EOPACE field campaign at the Army Research Facility, Duck, North Carolina, a Tandem Volatility Differential Mobility Analyser TVDMA was operated by Dr Barbara Brooks alongside the equipment deployed for all the other EOPACE campaigns. The TVDMA was developed for use in ground-based and airborne projects to extend the volatility analysis to smaller particles down to about 5nm radius as well as to overcome some of the deficiencies of the OPC approach, generally associated with more complex aerosol mixtures.

Subject Categories:

  • Meteorology
  • Physical Chemistry

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