AAAR 37th Annual Conference October 14 - October 18, 2019 Oregon Convention Center Portland, Oregon, USA
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Variations of New Particle Formation (NPF) Events during 2016-2018 in the Arctic Area (Ny-Alesund, Norway)
HAEBUM LEE, Young-Jun Yoon, Kihong Park, Gwangju Institute of Science and Technology
Abstract Number: 239 Working Group: Aerosol Physics
Abstract The Arctic area includes snow-covered land, sea ice, and ocean diversely affecting the Arctic climate system, and is so vulnerable to global climate change (M.O. Jeffries, & J Richter-Menge, 2012). Also, nanoparticles can grow up to sizes which have potential to become the CCN with the high population, affecting cloud properties. Thus, it is essential to understand major processes, leading to form nanoparticles in the Arctic atmosphere. The Arctic haze was observed in spring with increased pollutants transported from continents (Rahn and Shaw, 1977), and NPF events were often observed in summer (J Heintzenberg, et al., 2017). In this study, particle number size distribution in the size range of 3 nm to 60 nm was measured by a scanning mobility particle sizer (SMPS), which includes a nano-differential mobility analyzer (nano-DMA) (3081, TSI, USA) and an ultrafine condensation particle counter (UCPC) (3776, TSI, USA), to investigate NPF events during 2016 to 2018 at the Zeppelin laboratory (78.91° N, 11.88° E) in Ny-Alesund, Norway.
The highest particle number concentration for N(3-20 nm) and N(20-60 nm) were found in summer while both were the lowest in winter. Five distinct clusters were found, and the mode diameters of clusters were found to be 3.5 nm (cluster 1), 5 nm (cluster 2), 10 nm (cluster 3), 20 nm (cluster 4), and 40 nm (cluster 5), respectively. The fractions of clusters 1 and 2 significantly decreased in summer while the fractions of clusters 4 and 5 increased. Total 115 NPF event days during measurement period were counted (~ 16 % per year), and the highest percentage of NPF event days was observed in May, June, July, and August. In April, the NPF starting time was 9:00, and gradually increased up to 12:00 in July. The NPF duration time was around 5-6 hours on average, and higher in May-September than April and October. The overall average of GR appeared 1.56 ± 0.77 nm/h, and it was shown that the mean and median values were 1.65 nm/h and 1.54 nm/h, respectively.