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The active layer: two contrasting definitions

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  • C. R. Burn

Abstract

Traditionally, the active layer has been defined as the surficial layer above permafrost which thaws during summer. Under this definition, the active layer and permafrost are distinct. The definition has been used almost universally since the term was introduced into the English language by S. W. Muller over half a century ago. The definition of the active layer presented recently in the Canadian Glossary of Permafrost and Related Ground‐Ice Terms is based exclusively on the freezing of water in soil. The definition is constructed such that active‐layer thickness cannot be determined consistently in space and time, and is, therefore, impossible to use effectively in the field. © 1998 John Wiley & Sons, Ltd. Traditionnellement, la couche active a été définie comme la couche superficielle située audessus du pergélisol qui dégèle pendant l'été. D'après cette définition, la couche active et le pergélisol sont distincts. La définition a été presque universellement utilisée depuis que le terme a été introduit dans la langue anglaise par S. W. Muller il y a plus de cinquante ans. La définition de la couche active présentée récemment dans le “Glossary of Permafrost and Related Ground‐Ice Terms” publié au Canada, est basée exclusivement sur le gel de l'eau dans le sol. La définition est donnée de telle façon que l'épaisseur de la couche active ne peut pas être déterminée dans l'espace et dans le temps en conformité avec cette définition et qu'elle est en conséquence impossible à utiliser effectivement sur le terrain.

Suggested Citation

  • C. R. Burn, 1998. "The active layer: two contrasting definitions," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 9(4), pages 411-416, October.
  • Handle: RePEc:wly:perpro:v:9:y:1998:i:4:p:411-416
    DOI: 10.1002/(SICI)1099-1530(199810/12)9:43.0.CO;2-6
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    Cited by:

    1. Sarah M. Strand & Hanne H. Christiansen & Margareta Johansson & Jonas Åkerman & Ole Humlum, 2021. "Active layer thickening and controls on interannual variability in the Nordic Arctic compared to the circum‐Arctic," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 32(1), pages 47-58, January.

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