title: Copenhagen--a significant source of birch (Betula) pollen?
abstract: Current aerobiological research applies the hypothesis that the main source of atmospheric birch (Betula) pollen is forest trees. Our results indicate that the measured levels in Copenhagen are not only due to birch trees in Danish forests but that the urban areas also seem to be a significant source of birch pollen. A number of episodes in 2003 with enhanced pollen levels in Copenhagen seem to be associated with parks and gardens inside and just outside the city. Our results also indicate one long-range transport episode from remote sources in Poland and Germany. Finally, our results show that the pollen levels vary considerably over the day and geographically between Copenhagen and the city of Roskilde, 40 km away. We suggest, that these differences in time and space in the pollen levels are mapped using an integrated monitoring strategy.
authors: National Environmental Research Institute, University of Aarhus, Frederiksborgvej 399, Roskilde, Denmark. cas@dmu.dk
authors: Carsten Ambelas
authors: CA
authors: Skjøth
authors: Janne
authors: J
authors: Sommer
authors: Jørgen
authors: J
authors: Brandt
authors: Martin
authors: M
authors: Hvidberg
authors: Camilla
authors: C
authors: Geels
authors: Kaj Mantzius
authors: KM
authors: Hansen
authors: Ole
authors: O
authors: Hertel
authors: Lise M
authors: LM
authors: Frohn
authors: Jesper H
authors: JH
authors: Christensen
mesh_terms: D001272:Atmosphere; D029662:Betula; D002940:Circadian Rhythm; D003718:Denmark; D008954:Models, Biological; D011058:Pollen; D012621:Seasons; D014887:Weather