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TZUNTIL:20051030T010000Z
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DTSTART:20031026T030000
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UID:www.bayceer.uni-bayreuth.de-bayceer-t53275id
DTSTAMP:20260805T172147Z
DESCRIPTION:Ombrotrophic peat bogs have been widely used to evaluate long-t
 erm records of atmospheric mercury (Hg) deposition. One of the major aims 
 of these investigations is the estimation of the increase of atmospheric H
 g fluxes during the industrial age compared to pre-industrial fluxes. Comp
 arability of Hg accumulation rates calculated from density\, peat accumula
 tion rates\, and Hg concentrations requires linearity between these parame
 ters. Peat formation is a dynamic process accompanied by intense mass loss
  and alteration of the organic material. Our investigations on three peat 
 cores from the Magellanic Moorlands\, Chile\, indicate that Hg concentrati
 ons in peat strongly depend on peat humification. Moreover\, differences i
 n mass accumulation rates during peat evolution are not compensated by lin
 ear changes in density\, peat accumulation or Hg concentrations. We sugges
 t normalizing Hg accumulation rates to carbon accumulation rates to achiev
 e comparability of Hg accumulation rates derived from differently altered 
 peat sections. Normalisation to the carbon accumulation rates reduces Hg a
 ccumulation rates in low degraded peat sections in the upper peat layers b
 y factors of more than two. Our results suggest that the modern times incr
 ease in Hg deposition rates derived from ombrotrophic peat bogs are potent
 ially overestimated if Hg accumulation rates are not corrected for mass ac
 cumulation rates.\n\n[Extenden Abstract zu diesem Vortrag] (pdf-Format)
DTSTART;TZID=Europe/Berlin:20040429T161500
DTEND;TZID=Europe/Berlin:20040429T235959
LOCATION:H6
SUMMARY:Dr. Harald Biester\, Institut für Umweltgeochemie der Universität H
 eidelberg: Do Mercury Records in Ombrotrophic Peat Bogs Solely Reflect Atm
 ospheric Deposition?
TRANSP:TRANSPARENT
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