A 25-year long series of observations of the parameter of aerosol condensation activity in the near-ground layer of the suburb atmosphere of Tomsk is analyzed. The regularities of inter-annual variations of its average monthly values are determined, as well as the dates of the spring maximum of condensation activity.
When studying the condensation growth of atmospheric aerosol, many researchers note the dependence of hygroscopic properties on the particle size. In this work we consider the relationship between the parameter of condensation activity and the parameters of particle size distribution in the nanometer range on the example of test measurements. Due to the small amount of data, the results are preliminary.
The relationship between the aerosol hygroscopic properties and the volume fraction of substances evaporating from particles in different temperature ranges during their artificial heating was analyzed by the method of active spectral nephelometry based on the measurement data obtained in 2000-2019. Throughout the year, there is a stable negative correlation between the parameter of condensation activity and the volume fraction of substances volatilizing in the range of 200-250°C. A stable positive correlation is observed in the temperature range from 25-75 to 160-200°C, the boundaries of the interval vary depending on the season.
It is revealed based on the analysis of observations of the 24-year series (1998 – 2021) of the parameter of aerosol condensation activity in the near-ground layer of the atmosphere of Tomsk, that its most significant variation are observed in the annual cycle. Slower variations with a period of 6-7 years were also found.
When studying the condensation growth of atmospheric aerosol, many researchers note the dependence of the hygroscopic properties on the particle size. To reveal the role of particles of different sizes in the aerosol condensation activity, we analyzed the data of joint measurements of hygrograms of the scattering coefficient with an integral nephelometer and the size distribution function of dry particles in the diameter range of 0.4 - 20 μm using an optical counter in 2020.
When studying the condensation growth of atmospheric aerosol, many researchers note the dependence of the hygroscopic properties on the particle size. To change the aerosol size spectrum, we use diffusion selection, i.e. sequential removal of the finest fraction from the air flow. This makes it possible, on the one hand, to more accurately describe the distribution function in the size range r <0.2 μm, and, on the other hand, to increase the contribution of the intermediately dispersed fraction (r = 0.5 - 1 μm) to the formation of the optical signal. This work is devoted to the study of the sensitivity of the parameter of condensation activity of particles to changes in their size spectrum.
The diurnal variability of the parameters of condensation activity of different aerosol fractions obtained by means of an optical counter at the Aerosol station IAO SB RAS is analyzed. The diurnal behavior of the parameters of condensation activity of individual fractions in spring, autumn and winter 2020-2021 is compared with the parameter of condensation activity for the total scattering coefficient. Monitoring of the number concentrations was carried out in 2020-2021 within the framework of the state assignment of IAO SB RAS. The diurnal behavior of the condensation activity parameters was analyzed with the financial support of the Russian Science Foundation (agreement No. 19-77-20092).
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.