Active-Layer Characteristics and Summer Climatic Indices, Mackenzie Valley, Northwest Territories, Canada

被引:84
作者
Smith, Sharon L. [1 ]
Wolfe, Stephen A. [1 ]
Riseborough, Daniel W. [1 ]
Nixon, F. Mark [1 ]
机构
[1] Geol Survey Canada, Nat Resources Canada, Ottawa, ON K1A 0E8, Canada
关键词
active layer; permafrost; thaw depth; climate variability; Mackenzie Valley; MONITORING CALM SITES; PERMAFROST; BOREAL;
D O I
10.1002/ppp.651
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
Summer thaw depths at eight monitoring sites in the Mackenzie Valley, determined from probing of grids and thaw tubes, are used to characterise the spatial and temporal variations in active-layer thickness and to investigate linkages to climatic variations. Intra-site variability in thaw depths is typically low where organic cover is thin and uniform. Higher variability occurs where moisture contents and organic cover are high and spatially variable. Grid-mean thaw depths provide robust measures of the average site thaw depth, although they are less than annual maximum active-layer thicknesses determined by thaw tubes. Values from both measurements correlate reasonably well, permitting estimates of the variations in active-layer thickness from grid-mean thaw depths. Active-layer response to thermal forcing in various settings is well represented by grid-mean thaw depths and the square-root of late-season thawing-degree days. However, the effect of interannual climate variability on active-layer thickness is better assessed by maximum tube thaw depths and the square-root of total thawing-degree days. Copyright (C) Her Majesty the Queen in right of Canada. Published by John Wiley & Sons, Ltd.
引用
收藏
页码:201 / 220
页数:20
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