Thermal regime of ice-wedge cracking in adventdalen, Svalbard

被引：69

作者：

Christiansen, HH ^{[1
]}

机构：

[1] UNIS, Univ Ctr Svalbard, N-9171 Longyearbyen, Norway

来源：

PERMAFROST AND PERIGLACIAL PROCESSES | 2005年 / 16卷 / 01期

关键词：

ice wedges; thermal contraction cracking; low-centred polygons; Svalbard;

D O I：

10.1002/ppp.523

中图分类号：

P9 [自然地理学];

学科分类号：

0705 ; 070501 ;

摘要：

One year of monitoring (2002-2003) at a low-centred ice-wedge polygon site on Svalbard is described. Ground temperatures were recorded hourly from the top of an ice wedge through the active layer to the ground surface in the central part of a trough and in the adjacent rampart. Daily data on snow-cover depth were collected by automatic digital photography. Cracks were mapped in February, April and July. The results show that cracking occurred after ground temperatures at the centre of the ice-wedge top decreased to below -15 degrees C. Ground cooling in mid-winter occurred mainly through the snow-free ramparts because the ice-wedge troughs were filled by snow to depths of up to 30 cm. Copyright (c) 2005 John Wiley O Sons, Ltd.

引用

页码：87 / 98

页数：14

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