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Ion — particle interactions during particle formation and growth at a coniferous forest site in central Europe

DOI zum Zitieren dieses Dokuments: https://doi.org/10.5194/acpd-14-171-2014

Title data

Gonser, Stefan ; Klein, Felix ; Birmili, Wolfram ; Größ, Johannes ; Kulmala, Markku ; Manninen, Hanna E. ; Wiedensohler, Alfred ; Held, Andreas:
Ion — particle interactions during particle formation and growth at a coniferous forest site in central Europe.
In: Atmospheric Chemistry and Physics Discussions. Vol. 14 (2014) Issue 1 . - pp. 171-211.
ISSN 1680-7375
DOI: https://doi.org/10.5194/acpd-14-171-2014

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Abstract

In this work, we examined the interaction of ions and neutral particles during atmospheric new particle formation (NPF) events. The analysis is based on simultaneous field measurements of atmospheric ions and total particles using a neutral cluster and air ion spectrometer (NAIS) across the diameter range 2–25 nm. The "Waldstein" research site is located in a spruce forest in NE Bavaria, Southern Germany, known for enhanced radon concentrations, presumably leading to elevated ionization rates. Our observations show that the occurrence of the ion nucleation mode preceded that of the total particle nucleation mode during all analysed NPF events. The time difference between the appearance of 2 nm ions and 2 nm total particles was typically about 20 to 30 min. A cross correlation analysis showed a rapid decrease of the time difference between the ion and total modes during the growth process. Eventually, this time delay vanished when both ions and total particles did grow to larger diameters. Considering the growth rates of ions and total particles separately, total particles exhibited enhanced growth rates at diameters below 15 nm. This observation cannot be explained by condensation or coagulation, because these processes would act more efficiently on charged particles compared to neutral particles. To explain our observations, we propose a mechanism including recombination and attachment of continuously present cluster ions with the ion nucleation mode and the neutral nucleation mode, respectively.

Further data

Item Type: Article in a journal
Keywords: atmospheric new particle formation (NPF) events; ions; neutral particles; interaction
DDC Subjects: 500 Science
Institutions of the University: Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Atmospheric Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors > Professorship Atmospheric Chemistry - Univ.-Prof. Dr. Andreas Held
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors
Language: English
Originates at UBT: Yes
Date Deposited: 01 Dec 2015 10:08
Last Modified: 01 Dec 2015 10:08
URI: https://epub.uni-bayreuth.de/id/eprint/2103

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