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Seasonal variability in the physical characteristics of aerosol particles\udsampled from the King Sejong Station in the Antarctic Peninsula was\udinvestigated over the period between March 2009 and February 2015. Clear\udseasonal cycles for the total particle concentration (CN) were observed. The\udmean monthly concentration of particles larger than 2.5 nm (CN2.5) was\udhighest during the austral summer, with an average value of\ud1080.39 ± 595.05 cm−3, and lowest during the austral winter, with\uda mean value of 197.26 ± 71.71 cm−3. The seasonal patterns in the\udconcentrations of cloud condensation nuclei (CCN) and CN coincide, with both\udconcentrations being at a minimum in winter and maximum in summer. The\udmeasured CCN spectra were approximated by fitting a power-law function\udrelating the number of CCN for a given supersaturation (SS) to each SS value,\udwith fitting coefficients C and kT. The values for C varied from\ud6.35 to 837.24 cm−3, with a mean of 171.48 ± 62.00 cm−3.\udThe values for kT ranged from 0.07 to 2.19, with a mean of\ud0.41 ± 0.10. In particular, the kT values during the austral\udsummer were higher than those during the winter, indicating that aerosol\udparticles are more sensitive to SS changes during summer. Furthermore, the\udannual mean hygroscopicity parameter, κ, was estimated as\ud0.15 ± 0.05, for a SS of 0.4 %. The effects of the origin and\udpathway travelled by the air mass on the physical characteristics of the\udaerosol particles were also determined. The modal diameter of aerosol\udparticles originating in the South Pacific Ocean showed a seasonal variation\udvarying from 0.023 µm in winter to 0.034 µm in summer for\udthe Aitken mode, and from 0.086 µm in winter to 0.109 µm\udin summer for the accumulation mode

Seasonal variations in physical characteristics of aerosol particles at the King Sejong Station, Antarctic Peninsula