Geothermics and Climate Change: Observatory Mode

地热学和气候变化：观测站模式

• 批准号: 9706559
• 负责人: David Chapman
• 金额: $ 7.82万
• 依托单位: University of Utah
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-07-01 至 2000-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9706559&HistoricalAwards=false
• 关键词: Geothermics; Climate; Change; Observatory; Mode

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. ***

97-06559查普曼 在钻孔中测量的温度-深度剖面包含了过去地表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有价值的限制，这是一个超越历史气象学的关键时期。 记录 恢复的GST的最终分辨率取决于地下温度剖面的分辨率以及将温度剖面中的曲率划分为瞬时原因（即表面温度随时间的变化）和稳态原因（即地形、地形和植被、产热和热导率不均匀性、地下水运动等）的置信度。 由于对威尔斯井中温度的精确监测和重复记录将通过隔离温度场的瞬态分量来减少解释的模糊性，因此研究井眼热状况和 提出了它们随时间的变化规律。 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）重复记录钻孔，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和物理特性;（4）确定地面温度测试的时间和空间分辨率。 该项目的最终成果和意义是了解作为气候变化记录的地温，并对现有和正在进行的区域钻孔研究进行校准。 ***