Degradation of Archaeological Wood Under Freezing and Thawing Conditions—Effects of Permafrost and Climate Change

Henning Matthiesen · David Gregory · Jørgen Hollesen · Bo Elberling

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Conservation Techniques and Studies Wood Treatment and Properties Cultural Heritage Materials Analysis

Abstract

The degradation of archaeological wood at freezing and thawing temperatures is studied at the site of Q ajaa in W est G reenland through a combination of environmental monitoring, measurement of oxygen consumption and microscopy of wood samples. Permanently frozen wood is still very well preserved after 2–4000 years, while wood samples that thaw every summer show attack by soft rot and an average density loss of 0.1 g cm –3 (corresponding to 25% of the dry mass) over the past 27 years. Future increases in temperature may increase the decay rate significantly ( Q 10 = 4.2 at 0–10°C) but the effects on site depend on local hydrology.

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1991Archaeological Wood--Properties, Chemistry, and Preservation

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