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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. and Hermann, M. and Brenninkmeijer, C.A. and Heintzenberg, J. and Schlager, H. and Schuck, T. and Slemr, F. and Sprung, D. and van Velthoven, P. and Wiedensohler, A. and Zahn, A. and 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, pp. 8413-8430.

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

Abstract

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

Document Type:Article
Title:Origin of aerosol particles in the mid-latitude and subtropical upper troposphere and lowermost stratosphere from cluster analysis of CARIBIC data
Authors:
AuthorsInstitution or Email of Authors
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
Date:2009
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
In Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:9
Page Range:pp. 8413-8430
Status:Published
Keywords:Atmospheric aerosols, upper troposphere, lower stratosphere, CARIBIC
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Low-Emission Air Traffic (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Yasemin Yilmaz
Deposited On:15 Dec 2009 11:27
Last Modified:12 Dec 2013 20:48

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