Comparison of Seasonal Charicteristics of Cloud Condensation Nuclei Measured at Polar Regions

Abstract

Cloud Condensation Nuclei (CCN) concentrations have been measured at polar stations, (i) King Sejong station (62.22°S, 58.78°W) of Antarctic Peninsula and (ii) Zeppelin station (78.91°N, 11.89°E, Above sea level 474m) of Arctic region. Analysis of the CCN date were conducted for the periods from January 2009 to December 2010, for the cases when instruments of the both stations were operational. Commercially available CCN Counters (DMT-100) were deployed at both sites. Time resolution of measurements have been set as 1 second. The cycle of supersaturation was gradual increasing 5 steps, from 0.2% to 1.0%. The median value of CCN concentration at 0.4% supersaturation at Arctic and Antarctic stations were 89.13cm-3 and 112.53cm-3, respectively. The seasonal variations of CCN show different patterns for both polar regions, showing the highest value of 151.96cm-3 in spring and the lowest value of 26.16cm-3 in autumn, for Arctic region. On the other hand, for Antarctic atmosphere, seasonal median CCN concentration was highest at 199.65cm-3 in austral summer and the lowest at 46.73cm-3 in austral winter. CCN spectra was used to calculate the experimental parameters of C and k adapted from Seinfeld and Pandia (2016). During analysis period, for Arctic and Antarctic, entire median value of C were 98.78cm-3 and 124.99cm-3 and k values were estimated as 0.27 and 0.42, respectively.