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TZID:Europe/Berlin
TZUNTIL:20070325T010000Z
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DTSTART:20041031T030000
TZOFFSETFROM:+0200
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RDATE:20051030T030000
RDATE:20061029T030000
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UID:www.bayceer.uni-bayreuth.de-bayceer-t53225id
DTSTAMP:20260823T085858Z
DESCRIPTION:Tracing modern atmosphere dynamics is important to constrain mo
 dels used for past climate reconstruction. The main types of tracers of ar
 ctic air masses are chemical and show different patterns. Dust in the ice 
 at the summit of the Greenland ice cap has been shown\, through isotope an
 alyses\, to be originated from Chinese deserts\, mostly the Takla Makan an
 d Gobi. Conversely\, the chemical composition of the aerosols reaching the
  summit of the ice cap associated with backward air masses trajectories po
 ints to source areas in North America\, Europe and Asia. A total of four p
 ollen traps have been displayed on both coasts of Greenland during the las
 t years in order to assess long distance transport in the Arctic domain an
 d to identify potential vegetation source areas associated with air mass p
 athways. The on going EPILOBE project\, monitoring the pollen transport to
  the Greenland coast\, is based on four stations where filters are trappin
 g all year long the pollen grains present in the air. A first record of lo
 ng distance pollen transport to southern Greenland\, at Narsarsuaq\, have 
 been observed in 2002 through the capture of pollen grains from trees\, hi
 ckory and hemlock\, oak\, beech\, hornbeam\, walnut\, growing in North Ame
 rica. This transport was in agreement with the dates of pollen production 
 measured in southern Canada in the Toronto area\, at the northern range of
  the common distribution of these trees. The pattern of the transport had 
 been described by using the HYSPLIT application from NOAA\, which allows d
 etermining backward trajectories.\nA new transport to Narsarsuaq has been 
 observed in the filters exposed in Narsarsuaq at about the same timing tha
 n in 2003. The filters exposed during weeks 21 (20 - 26 May) and 22 (27 Ma
 y - 2 June) indicate the occurrence in the Greenland air of pollen grains 
 from trees\, which again are better growing in eastern North America. Desp
 ite the plants already observed in 2002\, which absolutely indicate North 
 America as a potential source of the pollen\, other trees\, also growing i
 n eastern North America have been noticed. These are poplar\, yew\, ash\, 
 plane tree\, and spruce. The backward air trajectories\, computed by the H
 YSPLIT application for the concerned weeks\, show mostly a similar pattern
  for most of the transport over the Great Lakes area. It appears then that
  a regular pattern of air masses responsible for the transport of pollen g
 rains from North America to Greenland should be constant\, as already desc
 ribed for anthropogenic pollutants.\nAnother pollen trap was installed on 
 the sea ice during the ice-sea drift expedition from North Pole of French 
 explorer Dr. Jean-Louis Etienne in 2002. The results show two different pa
 tterns within an interval of two weeks. Until now the use of pollen as an 
 air mass tracer had not yet been investigated. Here we show that first evi
 dence pollen represents a biological alternative to understand both presen
 t and past air mass dynamics in the Arctic and its associated relationship
  with biosphere changes.
DTSTART;TZID=Europe/Berlin:20050524T181500
DTEND;TZID=Europe/Berlin:20050524T235959
LOCATION:H6
SUMMARY:Dr. Denis-Didier Rousseau\, Institut des Sciences de l\'Evolution (
 UMR CNRS 5554) Université Montpellier II und Alexander-von Humboldt Preist
 räger am LS Geomorphologie der UBT: Pollen transport in the Arctic: eviden
 ces of a late spring long distance transport with changing trajectories an
 d implication to paleoreconstructions
TRANSP:TRANSPARENT
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