Long‐term trend analysis of aerosol variables at the high‐alpine site Jungfraujoch
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Autor:innen
Collaud Coen, Martine
Nyeki, Stephan
Cozic, Julie
Henning, Silvia
Verheggen, Bart
Gehrig, Robert
Baltensperger, Urs
Autor:in (Körperschaft)
Publikationsdatum
13.07.2007
Typ der Arbeit
Studiengang
Typ
01A - Beitrag in wissenschaftlicher Zeitschrift
Herausgeber:innen
Herausgeber:in (Körperschaft)
Betreuer:in
Übergeordnetes Werk
Journal of Geophysical Research: Atmospheres
Themenheft
DOI der Originalpublikation
Link
Reihe / Serie
Reihennummer
Jahrgang / Band
112
Ausgabe / Nummer
D13
Seiten / Dauer
Patentnummer
Verlag / Herausgebende Institution
Wiley
Verlagsort / Veranstaltungsort
Hoboken
Auflage
Version
Programmiersprache
Abtretungsempfänger:in
Praxispartner:in/Auftraggeber:in
Zusammenfassung
This study reports the first long-term trend analysis of aerosol optical measurements at the high-alpine site Jungfraujoch, which started 10.5 years ago. Since the aerosol variables are approximately lognormally distributed, the seasonal Kendall test and Sen's slope estimator were applied as nonparametric methods to detect the long-term trends for each month. The yearly trend was estimated by a least-mean-square fit, and the number of years necessary to detect this trend was calculated. The most significant trend is the increase (4–7% yr−1) in light-scattering coefficients during the September to December period. The light absorption and backscattering coefficients and the aerosol number concentration also show a positive trend during this time of the year. The hemispheric backscattering fraction and the scattering exponent calculated with the smaller wavelengths (450 and 550 nm), which relate to the small aerosol size fraction, decrease except during the summer, whereas the scattering exponent calculated with the larger wavelengths (550 and 700 nm) remains constant. Generally, the summer months at the Jungfraujoch, which are strongly influenced by planetary boundary layer air masses, do not show any long-term trend. The trends determined by least-mean-square fits of the scattering and backscattering coefficients, the hemispheric backscattering fractions, and the scattering exponent are significant, and the number of years necessary to detect them is shorter than 10 years. For these variables, the trends and the slopes estimated by the seasonal Kendall test are therefore confirmed by the least-mean-square fit results.
Schlagwörter
Fachgebiet (DDC)
535 - Licht und phototechnische Phänomene
550 - Geowissenschaften
550 - Geowissenschaften
Veranstaltung
Startdatum der Ausstellung
Enddatum der Ausstellung
Startdatum der Konferenz
Enddatum der Konferenz
Datum der letzten Prüfung
ISBN
ISSN
2169-8996
2169-897X
2169-897X
Sprache
Englisch
Während FHNW Zugehörigkeit erstellt
Nein
Zukunftsfelder FHNW
Publikationsstatus
Veröffentlicht
Begutachtung
Peer-Review der ganzen Publikation
Open Access-Status
Closed
Lizenz
Zitation
COLLAUD COEN, Martine, Ernest WEINGARTNER, Stephan NYEKI, Julie COZIC, Silvia HENNING, Bart VERHEGGEN, Robert GEHRIG und Urs BALTENSPERGER, 2007. Long‐term trend analysis of aerosol variables at the high‐alpine site Jungfraujoch. Journal of Geophysical Research: Atmospheres. 13 Juli 2007. Bd. 112, Nr. D13. DOI 10.1029/2006jd007995. Verfügbar unter: https://irf.fhnw.ch/handle/11654/46714