Simultaneous dry and ambient measurements of aerosol size distributions at the Jungfraujoch
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Autor:in (Körperschaft)
Publikationsdatum
01.01.2003
Typ der Arbeit
Studiengang
Typ
01A - Beitrag in wissenschaftlicher Zeitschrift
Herausgeber:innen
Herausgeber:in (Körperschaft)
Betreuer:in
Übergeordnetes Werk
Tellus B: Chemical and Physical Meteorology
Themenheft
DOI der Originalpublikation
Link
Reihe / Serie
Reihennummer
Jahrgang / Band
55
Ausgabe / Nummer
3
Seiten / Dauer
808-819
Patentnummer
Verlag / Herausgebende Institution
Stockholm University Press
Verlagsort / Veranstaltungsort
Stockholm
Auflage
Version
Programmiersprache
Abtretungsempfänger:in
Praxispartner:in/Auftraggeber:in
Zusammenfassung
In a field campaign at the high-alpine site Jungfraujoch (JFJ, 3580 m asl), in-situ aerosol size distributions were measured simultaneously outdoor at ambient conditions (temperature T < -5 °C) and indoor at dry conditions (T ≈ 25 °C and relative humidity RH < 10%) by means of two scanning mobility particle sizers (SMPS). In addition, measurements of hygroscopic growth factors were performed with a hygroscopicity tandem differential mobility analyzer (H-TDMA). The measured growth factors, being a monotonic function of the relative humidity (RH), were fitted with a modified Köhler model. A comparison between dry and ambient size distributions shows two main features: First, the dry total number concentration is often considerably smaller (on average 28%) than the ambient total number concentration, and is most likely due to the evaporation of volatile material at the higher temperature. These particle losses mainly concern small particles (dry diameter D ≲ 100 nm), and therefore have only a minimal affect on the surface and volume concentrations. A slight correlation between ambient RH and the magnitude of particle loss was observed, but it was not possible to establish an empirical model for a quantification. Second, the dry number size distribution is shifted towards smaller particles, reflecting the hygroscopic behavior of the aerosols. To link the ambient and the dry size distributions we modeled this shift using the H-TDMA measurements and a modified Köhler model. The corrected dry surface and volume concentrations are in good agreement with the ambient measurements for the whole RH range, but the correction works best for RH < 80%. The results indicate that size distribution data measured at indoor conditions (i.e. dry and warm) may be successfully corrected to reflect ambient conditions, which are relevant for determining the impact of aerosol on climate.
Schlagwörter
Fachgebiet (DDC)
550 - Geowissenschaften
Veranstaltung
Startdatum der Ausstellung
Enddatum der Ausstellung
Startdatum der Konferenz
Enddatum der Konferenz
Datum der letzten Prüfung
ISBN
ISSN
1600-0889
0280-6509
0280-6509
Sprache
Englisch
Während FHNW Zugehörigkeit erstellt
Nein
Zukunftsfelder FHNW
Publikationsstatus
Veröffentlicht
Begutachtung
Peer-Review der ganzen Publikation
Open Access-Status
Closed
Lizenz
Zitation
NESSLER, R., Nicolas BUKOWIECKI, Silvia HENNING, Ernest WEINGARTNER, Bertrand CALPINI und Urs BALTENSPERGER, 2003. Simultaneous dry and ambient measurements of aerosol size distributions at the Jungfraujoch. Tellus B: Chemical and Physical Meteorology. 1 Januar 2003. Bd. 55, Nr. 3, S. 808–819. DOI 10.3402/tellusb.v55i3.16371. Verfügbar unter: https://irf.fhnw.ch/handle/11654/46826