ARCTIC PERMAFROST THERMAL VARIABILITY ACROSS AN ENVIRONMENTAL GRADIENT FROM CONTINUOUS TO SPORADIC PERMAFROST IN THE NORTHERN HEMISPHERE – A PAGE21 COMPILATION

Hanne H. Christiansen, Julia Boike, J. van Huissteden, Birger U. Hansen, Margareta Johansson, Go Iwahana, Boris K. Biskaborn

In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost Conference

Session: Characterization of Permafrost State and Variability I / Caractérisation et variabilité du pergélisol I

ABSTRACT: Permafrost temperatures are recorded in dominant ice-rich periglacial landforms in five different sites of continuous and sporadic permafrost for improved understanding of physical permafrost processes, and for the comparison of these processes between the five sites. Additionally active layer thickness from the official CALM data from each of the same sites have been compared. The landscapes vary from high-relief mountainous terrain to deltaic and floodplain lowlands, and are thus characteristic of large parts of the permafrost landscapes in the Northern Hemisphere, representing the landscape variability. Significant variation is seen in terms of the sensitivity towards climate change between the five site, ranging from relatively cold -, but with very large thermal conductivity, over warmer -permafrost in Svalbard with normal thermal conductivity, to permafrost warmer than -is found in Svalbard, and thinnest in Kytalyk in Siberia, but with the peat of the sporadic permafrost in Abisko at an intermediate level.

RÉSUMÉ: Des températures du pergélisol ont été enregistrées dans des formes périglaciaires riches en glace sur cinq sites différents de pergélisol continu et sporadique afin de mieux comprendre les processus physiques du pergélisol et de de la couche active à partir des données officielles de -relief montagneux, aux basses terres nord, ce qui reflète la variabilité du paysage. Une variation significative entre les cinq sites est perçue en termes de -8 °C) en Sibérie, mais avec une très -4 °C) à Svalbard avec une conductivité thermique normale, à un pergélisol plus chaud de près de -1 °C à Abisko. La couche active la plus épaisse se trouve à Svalbard et la plus mince à Kytalyk en Sibérie. Étant donné la présence de tourbe, le pergélisol sporadique à Abisko se trouve à un niveau intermédiaire.

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