Influence of the Active Layer and Snow Cover on the Thermal Regime of Permafrost

活动层和积雪对多年冻土热状况的影响

• 批准号: 9122928
• 负责人: Thomas Osterkamp
• 金额: $ 20.57万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-06-01 至 1996-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9122928&HistoricalAwards=false
• 关键词: Influence; Active; Layer; Snow; Cover

Permafrost temperatures are an extremely sensitive indicator of climatic change. Changes too small to be detected by continuous measurements of the surface energy budget occur as clear and robust changes in permafrost temperature profiles. This award supports research to allow rational utilization of permafrost temperature data and to improve current interpretations of permafrost temperature profiles. These tasks require a better understanding of the influence of the active layer and snow cover on the thermal regime of permafrost. The research program consists of field and laboratory measurements, interpretation, and modeling the thermal response of permafrost to changes in climate. This research will be conducted at four established sites along the Haul Road between the Brooks Range and Prudhoe Bay. Measurements will include daily temperatures at eleven levels from the air 1/2m or more into the permafrost, annual permafrost temperatures to depths of 80m, in situ and laboratory measurements of thermal and other properties of the numerical model for predicting temperatures at all levels. This continuing research effort is necessary to develop an understanding of climatic change that has occurred and may be occurring in the permafrost areas of Alaska and the north polar region.

永久冻土温度是气候变化的一个极其敏感的指标。地表能量收支的连续测量无法检测到太小的变化，这种变化发生在永久冻土温度剖面的明显和强劲的变化中。该奖项支持允许合理利用永久冻土温度数据并改进目前对永久冻土温度剖面的解释的研究。这些任务需要更好地了解活动层和积雪对永久冻土热状况的影响。该研究计划包括现场和实验室测量、解释和模拟永久冻土对气候变化的热响应。这项研究将在布鲁克斯山脉和普拉德霍湾之间的长途公路沿线的四个既定地点进行。测量将包括从空气1/2米或更多进入永久冻土的11个水平的每日温度，从永久冻土到深度80米的年度永久冻土温度，现场和实验室对用于预测所有水平温度的数值模型的热和其他性质的测量。这项持续的研究工作对于了解阿拉斯加和北极地区已发生和可能发生的气候变化是必要的。