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Measurements of Aerosols and Precursors over East Antarctic melting spring sea ice

Measurements of Aerosols and Precursors over East Antarctic melting spring sea ice
Ruhi Humphries

Authors

R. Humphries1, R. Schofield2, M. Keywood3, J. Ward4, S. Wilson1, I. Galbally3, K. Kreher5, P. Johnston5, A. Thomas5, A. Robinson6, N. Harris6, A. Klekociuk7, C. Murphy1

  1. Centre for Atmospheric Chemistry, University of Wollongong, Wollongong, Australia
  2. University of Melbourne, Melbourne, Australia
  3. Centre for Australian Weather and Climate Research, CSIRO Marine and Atmospheric Research, Aspendale, Australia
  4. CSIRO Marine and Atmospheric Research, Aspendale, Australia
  5. National Institute of Water and Atmospheric Research, Lauder, New Zealand
  6. Centre for Atmospheric Science, Department of Chemistry, Cambridge CB2 1EW, England
  7. Australian Antarctic Division, Hobart, Australia

Abstract

The pristine environment of the Antarctic allows the study of natural aerosol properties and formation mechanisms in polar conditions, with minor anthropogenic influence reaching the remote continent. Studies of aerosols over Antarctic sea ice have not been made, with measurement campaigns being confined primarily to permanent stations on continental and coastal locations. The MAPS campaign (Measurements of Aerosols and Precursors during SIPEXII) occurred as part of the Sea Ice Physics and Ecosystems eXperiment II (SIPEX II) in Spring, 2012, and aimed to characterize new particle formation processes in the sea ice region off the coast of East Antarctica (~65°S, 120°E). Measurements were made of in-situ total particle number above two size thresholds, > 3 nm, and > 10 nm, with the difference being the number of particles in the 3-10 nm range, or the particle nucleation region. Vertical profiles of aerosol extinction and dominant size mode were measured via MAX-DOAS. Precursors such as halogenated volatile organic compounds (VOCs), halogen oxides, dimethyl sulfide (DMS), formaldehyde (HCHO), and ozone were also measured by both in-situ and spectroscopic techniques. A number of new particle formation events were observed throughout the measurement campaign, occurring in diverse conditions (e.g. sunlit and dark), suggesting various reaction mechanisms. Presented here are the data from these new particle formation events, along with preliminary analysis of the chemical sources and possible formation mechanisms that may be unique to this unstudied region.

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Key dates

  • 11th June 2013
    Registrations close
  • 21st June 2013
    Registrations at the AAD open for staff
  • 24th June 2013
    Registrations at the venue open
  • 24th June 2013
    Conference commences
  • 26th June 2013
    Conference concludes

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This page was last modified on 2 September 2013.