Features in air ions measured by an air ion spectrometer (AIS) at Dome C

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dc.contributor.author Chen, Xuemeng
dc.contributor.author Virkkula, Aki
dc.contributor.author Kerminen, Veli-Matti
dc.contributor.author Manninen, Hanna E.
dc.contributor.author Busetto, Maurizio
dc.contributor.author Lanconelli, Christian
dc.contributor.author Lupi, Angelo
dc.contributor.author Vitale, Vito
dc.contributor.author Del Guasta, Massimo
dc.contributor.author Grigioni, Paolo
dc.contributor.author Väänänen, Riikka
dc.contributor.author Duplissy, Ella-Maria
dc.contributor.author Petäjä, Tuukka
dc.contributor.author Kulmala, Markku
dc.date.accessioned 2017-11-30T10:46:01Z
dc.date.available 2017-11-30T10:46:01Z
dc.date.issued 2017-11-20
dc.identifier.citation Chen , X , Virkkula , A , Kerminen , V-M , Manninen , H E , Busetto , M , Lanconelli , C , Lupi , A , Vitale , V , Del Guasta , M , Grigioni , P , Väänänen , R , Duplissy , E-M , Petäjä , T & Kulmala , M 2017 , ' Features in air ions measured by an air ion spectrometer (AIS) at Dome C ' , Atmospheric Chemistry and Physics , vol. 17 , no. 22 , pp. 13783-13800 . https://doi.org/10.5194/acp-17-13783-2017
dc.identifier.other PURE: 94431311
dc.identifier.other PURE UUID: b4ad2c1f-4d2e-4b25-9ebd-178da1d45d55
dc.identifier.other WOS: 000415759400001
dc.identifier.other Scopus: 85034658030
dc.identifier.other ORCID: /0000-0002-7731-6842/work/39205686
dc.identifier.other ORCID: /0000-0002-1881-9044/work/102822400
dc.identifier.uri http://hdl.handle.net/10138/228956
dc.description.abstract An air ion spectrometer (AIS) was deployed for the first time at the Concordia station at Dome C (75 degrees 06'S, 123 degrees 23'E; 3220 ma.s.l.), Antarctica during the period 22 December 2010-16 November 2011 for measuring the number size distribution of air ions. In this work, we present results obtained from this air ion data set together with aerosol particle and meteorological data. The main processes that modify the number size distribution of air ions during the measurement period at this high-altitude site included new particle formation (NPF, observed on 85 days), wind-induced ion formation (observed on 36 days), and ion production and loss associated with cloud/fog formation (observed on 2 days). For the subset of days when none of these processes seemed to operate, the concentrations of cluster ions (0.9-1.9 nm) exhibited a clear seasonality, with high concentrations in the warm months and low concentrations in the cold. Compared to event-free days, days with NPF were observed with higher cluster ion concentrations. A number of NPF events were observed with restricted growth below 10 nm, which were termed as suppressed NPF. There was another distinct feature, namely a simultaneous presence of two or three separate NPF and subsequent growth events, which were named as multi-mode NPF events. Growth rates (GRs) were determined using two methods: the appearance time method and the mode fitting method. The former method seemed to have advantages in characterizing NPF events with a fast GR, whereas the latter method is more suitable when the GR was slow. The formation rate of 2 nm positive ions (J(2)(+)) was calculated for all the NPF events for which a GR in the 2-3 nm size range could be determined. On average, J(2)(+) was about 0.014 cm(-3) s(-1). The ion production in relation to cloud/fog formation in the size range of 8-42 nm seemed to be a unique feature at Dome C, which has not been reported elsewhere. These ions may, however, either be multiply charged particles but detected as singly charged in the AIS, or be produced inside the instrument, due to the breakage of cloud condensation nuclei (CCN), possibly related to the instrumental behaviour under the extremely cold condition. For the wind-induced ion formation, our observations suggest that the ions originated more likely from atmospheric nucleation of vapours released from the snow than from mechanical charging of shattered snow flakes and ice crystals. en
dc.format.extent 18
dc.language.iso eng
dc.relation.ispartof Atmospheric Chemistry and Physics
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject BOREAL FOREST
dc.subject GROWTH-RATES
dc.subject 114 Physical sciences
dc.title Features in air ions measured by an air ion spectrometer (AIS) at Dome C en
dc.type Article
dc.contributor.organization Department of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.5194/acp-17-13783-2017
dc.relation.issn 1680-7316
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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