Comparative analysis of hygroscopic properties of atmospheric aerosols at ZOTTO Siberian background station during summer and winter campaigns of 2011

Abstract

The results of measurements of hygroscopic properties and chemical analysis of atmospheric aerosol samples collected from June 10 to 20 and December 15 to 25, 2011, at the ZOTTO background stations (60.8A degrees N, 89.35A degrees E) in Central Siberia are presented. The sorption properties of aerosols are studied with the help of a differential analyzer of absorbed water mass in the relative humidity range of 5 to 99%. It has been found that the hygroscopic growth factor of aerosol particles collected during the winter campaign is on average 45% higher than that of the aerosol collected in the summer campaign, which leads to a 40% decrease in the critical supersaturation threshold of cloud activation of particles. The measurement data are analyzed and parameterized using a new approach that takes into account the concentration effects in the particle-water vapor system at low humidities. Based on the chemical analysis, the content of water-soluble substances in the winter sample is 2.5 times higher than in the summer sample. Here, the amount of sulfates and nitrates increases 20 and 88 times, respectively. A trajectory analysis of air mass motion shows that the increased content of inorganic ions in aerosols for the winter sample is caused by long-range transport of pollutants from industrial areas of Siberia. This difference in the chemical composition is the main source of the observed difference in hygroscopic and condensation properties of the aerosol particles

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“…Such information obtained experimentally is clearly not enough for the whole set of atmospheric-optical situations realized in the environment [53]. There have been attempts in the literature to connect aerosol properties, including hygroscopicity, with its chemical and disperse composition, type of air mass, and direction of its transfer [54][55][56][57]. Most studies of aerosol hygroscopic properties have been aimed at investigating the dynamics of size and optical constants of particles with changing humidity [57][58][59], and only a few works have been devoted to studying the actual optical and radiation-significant parameters [60][61][62][63][64].…”

Variability of monthly average characteristics of the aerosol condensation activity in annual behavior

“…[3][4][5][6][7][8][9][10][11][12][13] To correctly account for the aerosol properties in radiation models on different timescales and in different climatic zones, the seasonal and regional features and regularities of aerosol condensation activity should be known. A lot for papers are devoted to determination of the aerosol hygroscopic properties [14][15][16][17][18][19][20][21][22] in the near-ground atmosphere and their variability on different time scales from several hours to tens of years. The main attention of this paper is paid to the inter-annual variations of monthly average values of the parameter of condensation activity and fluctuations in the dates of its maximum in the spring.…”

Main cycles of variability of the aerosol condensation activity in Tomsk in 1998 - 2021

“…[3][4][5][6][7][8][9][10][11][12] To correctly account for the aerosol properties in radiation models on different timescales and in different climatic zones, the seasonal and regional features and regularities of aerosol condensation activity should be known. A lot for papers are devoted to determination of the aerosol hygroscopic properties [13][14][15][16][17][18][19][20][21] in the near-ground atmosphere and their variability on different time scales from several hours to tens of years.…”