Boundary layer new particle formation over East Antarctic sea ice - Possible Hg driven nucleation?
RS Humphries, R Schofield, M Keywood, J Ward, JR Pierce, CM Gionfriddo, M Tate, D Krabbenhoft, IE Galbally, SB Molloy, A Klekociuk, PV Johnston, K Kreher, AJ Thomas, AD Robinson, NRP Harris, R Johnson, SR Wilson
Atmospheric Chemistry and Physics Discussions | Published : 2015
Abstract. 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 m−2. Within the single air-mass influencing the measurements, number concentrations of particles larger than 3 nm (CN3) reached almost 7700 cm−3 within a few hours of clouds clearing, and grew at rates of 5.6 nm h−1. Formation rates of 3 nm particles were in ..View full abstract