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Determination of pollen accumulation rates in frozen sediments

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  • Xia‐Cheng Wang
  • Marie‐Anne Geurts

Abstract

Pollen accumulation rates (PAR) of 48 samples from a permafrost core were calibrated to assess the influence of ice lensing on the calculations. Results show that permafrost formation can radically change PAR values. Accumulation of segregated ice is a major source of error, while the 9% volumetric expansion of pore water upon freezing must also be considered. The basic result of these influences is the exaggeration of sedimentation rates and sample volumes. Des vitesses d'accumulation de pollen (PAR) de 48 échantillons d'un sondage creusé dans le pergélisol ont été calibrées pour éliminer dans les calculs l'influence de la croissance des lentilles de glace. Les résultats montrent que la formation d'un pergélisol peut changer radicalement les valeurs de ce coefficient (PAR). L'accumulation de glace de ségrégation est une source majeure d'erreur mais l'expansion volumétrique de 9% de l'eau des pores doit aussi ětre considérée. Le résultat de ces influences est d'exagérer les vitesses de sédimentation et les volumes de échantillons.

Suggested Citation

  • Xia‐Cheng Wang & Marie‐Anne Geurts, 1993. "Determination of pollen accumulation rates in frozen sediments," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 4(1), pages 87-93, January.
    • Handle: RePEc:wly:perpro:v:4:y:1993:i:1:p:87-93
    DOI: 10.1002/ppp.3430040108
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