Journal article

Boundary layer new particle formation over East Antarctic sea ice - possible Hg-driven nucleation?

RS Humphries, R Schofield, MD Keywood, J Ward, JR Pierce, CM Gionfriddo, MT Tate, DP Krabbenhoft, IE Galbally, SB Molloy, AR Klekociuk, PV Johnston, K Kreher, AJ Thomas, AD Robinson, NRP Harris, R Johnson, SR Wilson



Aerosol observations above the Southern Ocean and Antarctic sea ice are scarce. Measurements of aerosols and atmospheric composition were made in East Antarctic pack ice on board the Australian icebreaker Aurora Australis during the spring of 2012. One particle formation event was observed during the 32 days of observations. This event occurred on the only day to exhibit extended periods of global irradiance in excess of 600 W mg'2. Within the single air mass influencing the measurements, number concentrations of particles larger than 3 nm (CN3) reached almost 7700 cmg'3 within a few hours of clouds clearing, and grew at rates of 5.6 nm hg'1. Formation rates of 3 nm particles were in the ran..

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University of Melbourne Researchers


Awarded by Australian Antarctic Science Grant Programme (AAS)

Awarded by Natural Environment Research Council

Funding Acknowledgements

This research was funded by the Australian Antarctic Science Grant Programme (AAS project 4032). Additional support was also provided by the CSIRO OCE Postgraduate Top-Up Scholarship. We would also like to thank the SIPEXII team and the Australian Antarctic Division for logistics and technical support during the campaign, in particular L. Symons, K. Briggs, M. Jordan, M. Longmire, I. McLean, J. Reeve and K. Meiners. We thank R. Chang and F. Yu for assistance in model commissioning. Development of the mu Dirac was funded by the UK Natural Environmental Research Council (NERC). We thank A. Gordon for running the peak analysis software for the mu Dirac. N. Harris and A. Robinson would like to thank NERC for financial support through an Advanced Research Fellowship and the CAST project.