Interpretation of Atmospheric Aerosol Measurements by Means of a Numerical Simulator of New Particle Formation Events

Luts, Aare; Hõrrak, Urmas; Salm, J.; Vana, Marko; Tammet, Hannes

doi:10.4209/aaqr.2015.08.0511

Cited by 2 publications

(2 citation statements)

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“…The effect of child patients on the concentration of light air ions is related to the number of condensation nuclei in Nagel's Dome. During the time the children play ball games or do other exercises, they raise tiny dust particles from the ground (as confirmed through measuring the number of aerosol particles before and after the activities, Figure 18); light air ions then adhere to this dust, and their concentration becomes reduced (this process is in agreement with the theory of the formation and disappearance of air ions as described in sources [36,39]). By extension, the mobility of the ions is also affected.…”

Section: Correlations Between the Presence Of Patients Ambient Temperature And Concentration Of Light Ionssupporting

confidence: 71%

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Evaluating the Parameters of a Systematic Long-Term Measurement of the Concentration and Mobility of Air Ions in the Environment inside Císařská Cave

et al. 2021

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Determining the concentration and mobility of light air ions is an indispensable task to ensure the successful performance and progress of various operations within multiple fields and branches of human activity. This article discusses a novel methodology for measuring air ions in an environment with high relative humidity, such as that of a cave. Compared to common techniques, the proposed method exhibits a lower standard deviation and analyses the causes of spurious oscillations in the measured patterns obtained from FEM-based numerical simulations on the one hand and a model with concentrated parameters on the other. The designed ion meter utilises a gerdien tube to facilitate long-term measurement in cold and very humid spaces, an operation that can be very problematic if executed with other devices. Importantly, the applied procedure for calculating the mobility spectra of air ions from the acquired saturation characteristics is insensitive to fluctuations and noises in the measured patterns, and it also enables us to confirm the presence of very mobile air ions generated by fragmenting water droplets. During the sensing cycles, the concentration of light negative ions was influenced by the active gerdien tube. For the investigated cave, we had designed a measuring sequence to cover not only the time dependence of the concentration of light negative ions but also their mobility; this approach then allowed monitoring the corresponding impact of the patients’ presence in the cave, an effect neither described nor resolved thus far. Such comprehensive research, especially due to its specific character, has not been frequently conducted or widely discussed in the literature; the efforts characterised herein have therefore expanded the relevant knowledge and methodology, thus contributing towards further advancement in the field.

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Section: Correlations Between the Presence Of Patients Ambient Temperature And Concentration Of Light Ionssupporting

confidence: 71%

“…Measuring the properties of air ions is a topical problem that has been analysed by multiple laboratories [22,29,36]. At present, the concentration of air ions is frequently assessed with gerdien tubes (GT).…”

Section: Introductionmentioning

confidence: 99%