Airborne pollen in three European cities: Detection of atmospheric circulation pathways by applying three-dimensional clustering of backward trajectories

L. Makra, Tamás Sánta, István Matyasovszky, Athanasios Damialis, Kostas Karatzas, Karl Christian Bergmann, Despoina Vokou

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

The long-range transport of particulates can substantially contribute to local air pollution. The importance of airborne pollen has grown due to the recent climate change; the lengthening of the pollen season and rising mean airborne pollen concentrations have increased health risks. Our aim is to identify atmospheric circulation pathways influencing pollen levels in three European cities, namely Thessaloniki, Szeged, and Hamburg. Trajectories were computed using the HYSPLIT model. The 4 day, 6 hourly three-dimensional (3-D) backward trajectories arriving at these locations at 1200 UT are produced for each day over a 5 year period. A k-means clustering algorithm using the Mahalanobis metric was applied in order to develop trajectory types. The delimitation of the clusters performed by the 3-D function "convhull" is a novel approach. The results of the cluster analysis reveal that the main pathways for Thessaloniki contributing substantially to the high mean Urticaceae pollen levels cover western Europe and the Mediterranean. The key pathway patterns for Ambrosia for Szeged are associated with backward trajectories coming from northwestern Europe, northeastern Europe, and northern Europe. A major pollen source identified is a cluster over central Europe, namely the Carpathian basin with peak values in Hungary. The principal patterns for Poaceae for Hamburg include western Europe and the mid-Atlantic region. Locations of the source areas coincide with the main habitat regions of the species in question. Critical daily pollen number exceedances conditioned on the clusters were also evaluated using two statistical indices. An attempt was made to separate medium-and long-range airborne pollen transport.

Original languageEnglish
Article numberD24220
JournalJournal of Geophysical Research: Space Physics
Volume115
Issue number24
DOIs
Publication statusPublished - 2010

Fingerprint

pollen
atmospheric circulation
trajectories
trajectory
Trajectories
Health risks
Cluster analysis
Western European region
Air pollution
Clustering algorithms
Climate change
Mid-Atlantic region
Ambrosia
Urticaceae
Central Europe
Hungary
air pollution
cluster analysis
habitats
city

ASJC Scopus subject areas

  • Atmospheric Science
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Airborne pollen in three European cities : Detection of atmospheric circulation pathways by applying three-dimensional clustering of backward trajectories. / Makra, L.; Sánta, Tamás; Matyasovszky, István; Damialis, Athanasios; Karatzas, Kostas; Bergmann, Karl Christian; Vokou, Despoina.

In: Journal of Geophysical Research: Space Physics, Vol. 115, No. 24, D24220, 2010.

Research output: Contribution to journalArticle

Makra, L. ; Sánta, Tamás ; Matyasovszky, István ; Damialis, Athanasios ; Karatzas, Kostas ; Bergmann, Karl Christian ; Vokou, Despoina. / Airborne pollen in three European cities : Detection of atmospheric circulation pathways by applying three-dimensional clustering of backward trajectories. In: Journal of Geophysical Research: Space Physics. 2010 ; Vol. 115, No. 24.
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