GroundTemperatureandPermafrostMappingUsinganEquivalentLatitude/ElevationModel应用等效纬度-海拔模型进行地温及多年冻土制图
- 出版年：2002
- 作者：Kenji yoshikawa；Larry D.Hinzman；Prasad Gogineni
- 单位1：Water and Environmental Research Center, University of Alaska Fairbanks
- 语种：中文
- 作者关键词：ground temperature；permafrost mapping；latitude；elevation
- 起始页：526
- 总页数：6
- 刊名：冰川冻土
- 是否内版：否
- 刊频：双月刊
- 创刊时间：1979
- 主办单位：中国地理学会；中国科学院寒区旱区；环境与工程研究所
- 主编：程国栋
- 地址：兰州市东岗西路260号
- 邮编：730000
- 电子信箱：Edjgg@ns.lzb.ac.cn
- 卷：24
- 期：5
摘要
This research presents a method for permafrost mapping in discontinuous permafrost regionsbased on equivalent latitude/elevation cencept in interior Alaska. In winter months, study site has astrong temperature inversion in air up to 700 m elevation. Air temperature data and the effects of slope,aspect and elevation were used to create an equivalent latitude/elevation model. This model was well cor-related with mean annual surface temperature (0.79). In this watershed, the thawing index (I_t≈1 400°C· days) at the ground surface and snow depth do not vary greatly from south facing to north facingslopes. The primary controlled factor that determines the mean annual surface tempcrature was the win-ter surface temperature. The permafrost stability is effectively controlled by the freezing index. We de-termined 37.5％ of Caribou-Poker Creeks Research Watershed has unstable or thawing permafrost. Atleast 2.1% of the permafrost in this watershed may have disappeared in the last 90 years due to climatewarming. This method makes it possible to evaluate the permafrost stability in the present, past and fu-ture.