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Origin of aerosol particles in the mid-latitude and subtropical upper troposphere and lowermost stratosphere from cluster analysis of CARIBIC data

Köppe, M. und Hermann, M. und Brenninkmeijer, C.A. und Heintzenberg, J. und Schlager, H. und Schuck, T. und Slemr, F. und Sprung, D. und van Velthoven, P. und Wiedensohler, A. und Zahn, A. und Ziereis, H. (2009) Origin of aerosol particles in the mid-latitude and subtropical upper troposphere and lowermost stratosphere from cluster analysis of CARIBIC data. Atmospheric Chemistry and Physics, 9, Seiten 8413-8430.

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Offizielle URL: http://www.atmos-chem-phys.net/9/8413/2009/acp-9-8413-2009.pdf

Kurzfassung

The origin of aerosol particles in the upper troposphere and lowermost stratosphere over the Eurasian continent was investigated by applying cluster analysis methods to in situ measured data. Number concentrations of submicrometer aerosol particles and trace gas mixing ratios derived by the CARIBIC (Civil Aircraft for Regular Investigation of the Atmosphere Based on an Instrument Container) measurement system on flights between Germany and South-East Asia were used for this analysis. Four cluster analysis methods were applied to a test data set and their capability of separating the data points into scientifically reasonable clusters was assessed. The best method was applied to seasonal data subsets for summer and winter resulting in five cluster or air mass types: stratosphere, tropopause, free troposphere, high clouds, and boundary layer influenced. Other source clusters, like aircraft emissions could not be resolved in the present data set with the used methods. While the cluster separation works satisfactory well for the summer data, in winter interpretation is more difficult, which is attributed to either different vertical transport pathways or different chemical lifetimes in both seasons. The geographical distribution of the clusters together with histograms for nucleation and Aitken mode particles within each cluster are presented. Aitken mode particle number concentrations show a clear vertical gradient with the lowest values in the lowermost stratosphere (750�2820 particles/cm3 STP, minimum of the two 25% � and maximum of the two 75%-percentiles of both seasons) and the highest values for the boundary-layer-influenced air (4290�22 760 particles/cm3 STP). Nucleation mode particles are also highest in the boundary-layer-influenced air (1260� 29 500 particles/cm3 STP), but are lowest in the free troposphere (0�450 particles/cm3 STP). The given submicrometer particle number concentrations represent the first large-scale seasonal data sets for the upper troposphere and lowermost stratosphere over the Eurasian continent

Dokumentart:Zeitschriftenbeitrag
Titel:Origin of aerosol particles in the mid-latitude and subtropical upper troposphere and lowermost stratosphere from cluster analysis of CARIBIC data
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Köppe, M.IfT, Leipzig
Hermann, M.IfT, Leipzig
Brenninkmeijer, C.A.MPI Chemie, Mainz
Heintzenberg, J.IfT, Leipzig
Schlager, H.DLR
Schuck, T.MPI Chemie, Mainz
Slemr, F.MPI Chemie, Mainz
Sprung, D.Karlsruhe Inst. of Technology
van Velthoven, P.KNMI, De Bilt, NL
Wiedensohler, A.IfT, Leipzig
Zahn, A.IMK, Karlsruhe
Ziereis, H.DLR
Datum:2009
Erschienen in:Atmospheric Chemistry and Physics
Referierte Publikation:Ja
In Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:9
Seitenbereich:Seiten 8413-8430
Status:veröffentlicht
Stichwörter:Atmospheric aerosols, upper troposphere, lower stratosphere, CARIBIC
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:L VU - Luftverkehr und Umwelt (alt)
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L VU - Luftverkehr und Umwelt
DLR - Teilgebiet (Projekt, Vorhaben):L - Schadstoffarmer Luftverkehr (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe
Hinterlegt von: Yasemin Yilmaz
Hinterlegt am:15 Dez 2009 11:27
Letzte Änderung:12 Dez 2013 20:48

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