Thermal regime of sporadic permafrost in a block slope on Mt. Nishi-Nupukaushinupuri, Hokkaido Island, Northern Japan
Thermal regime of sporadic permafrost in a block slope on Mt. Nishi-Nupukaushinupuri, Hokkaido Island, Northern Japan
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DOI：
10.1016/s0169-555x(02)00252-0
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发表时间：
2003-05-30
期刊：
影响因子：
3.9
通讯作者：
Ono, Y
中科院分区：
文献类型：
--
作者：
Sawada, Y;Ishikawa, M;Ono, Y
在这项研究中，我们讨论了决定块体斜坡活动层地温状况的主要因素。积雪底部温度(BTS)、坡顶暖漏斗和块体坡面地温变化的分布表明冬季持续的空气环流。在春天，融雪的水流入山谷底部并重新冻结，将叠加的冰添加到常年冰上，填补粗糙块之间的空隙。在研究地点，地面温度在活动层的所有深度都显示出同步、突然的上升。这些结果有力地表明，冬季的大气环流和春季的结冰过程控制着年平均气温(MAAT)在0℃以上的块体斜坡活动层的热状况。(C)2002 Elsevier Science B.V.保留所有权利。
In this study, we discuss the predominant factors that determine the ground temperature regime of an active layer in a block slope. The distribution of the bottom temperature of snow cover (BTS) measurements, warm funnels at the top of the slope, and ground temperature changes on the block slope indicate continuous air circulation during the winter. In the spring, snowmelt water flows to the valley bottom and refreezes, adding superimposed ice onto the perennial ice that fills the voids between coarse blocks. At the study site, the ground temperatures showed a simultaneous, abrupt increase at all depths in the active layer. These results strongly suggest that air circulation in winter, as well as the ice formation processes in the spring, control the thermal regime of the active layer of the block slope with mean annual air temperature (MAAT) above 0 degreesC. (C) 2002 Elsevier Science B.V. All rights reserved.