Geothermics and Climate Change: Observatory Mode

在钻孔中测量的97-06559查普曼温度-深度剖面包含了过去地面温度变化的时间记录，并对过去几个世纪的气候变化提供了宝贵的约束，这是一个超过历史气象记录的关键时间段。恢复的GST的最终分辨率取决于地下温度分布的分辨率，以及人们在将温度分布中的曲率划分为瞬时原因(即地表温度随时间的变化)和稳态原因(即地形、地形和植被、产热和导热不均匀、地下水运动等)的可信度。由于井内温度的精确监测和重复测井将隔离温度场的瞬变分量，从而减少解释的模糊性，因此提出了一种研究井筒热状况及其随时间变化的方案。该项目需要1)运行实时地面观测站(安装在钻孔现场的气象站)以监测气象变量和近地表温度，2)重复测井以提高稳态温度场的分辨率，3)进行数据分析以计算边界的现场热物性，以及4)确定GSTS的时间和空间分辨率。该项目的最终成果和意义是将地面温度理解为气候变化的记录，并对现有和正在进行的区域钻孔研究进行校准。***

97-06559 Chapman Temperature-depth profiles, measured in boreholes, contain a temporal record of past changes in ground surface temperature (GST) and provide valuable constraints on climatic variations over the last few centuries, a critical time period that extends past the historical meteorological record. Ultimate resolution of the recovered GST depends on the resolution of the subsurface temperature profile and the confidence with which one can partition curvature in the temperature profile between transient causes (i.e. changes in surface temperature with time) and steady-state causes (i.e. topography, terrain and vegetation, heat production and thermal conductivity heterogeneities, groundwater movement, etc.). Because precision monitoring and repeat logging of temperatures in wells will reduce the interpretation ambiguity by isolating the transient component of the temperature field, a program of studying borehole thermal regimes and their changes with time is proposed. This project entails 1) operation of a real-time surface observatory (weather station installed at a borehole site) to monitor meteorological variables and near-surface temperature, 2) repeat logging of boreholes to improve the resolution of the steady-state temperature field, 3) data analysis to calculate the in-situ thermal and physical properties of the boundary, and 4) determining the temporal and spatial resolution of GSTs. The final product and significance of this project is an understanding of ground temperature as a record of climatic change and a calibration for existing and ongoing regional borehole studies. ***