Geothermics of Climate Change

Chapman和Harris0126029在钻孔中测量的温度-深度剖面包含了过去地表地温(SGT)变化的时间记录，并为过去几个世纪的气候变化提供了宝贵的约束。尽管在过去20年里，关于“气候变化的地热学”这一主题已经学到了很多，但仍然存在一些重要的问题。大陆的哪些地区正在经历短暂的地面变暖，升温幅度有多大？在全球变暖的仪器记录之前，工业革命时期的基线温度是多少？适用于气候变化研究的时间尺度上的气温和地面温度之间的关系是什么？地表温度变化对太阳辐射、降水和积雪等气候参数的敏感度如何？影响地热数据和气象地面气温(SAT)记录比较的重要因素是什么？由于20世纪气候变暖，地球外层储存了多少热量？该项目将通过开发气候变化地热学的方法和进行分析来回答这些问题。这项研究包括四项相互关联的任务：(1)运行实时地面观测站(位于钻孔现场的气象站)以监测气象变量和近地表温度；(2)数据分析，对太阳变化、降雪和降水对地面温度的影响进行定量估计；(3)在选定的钻孔中重复温度记录，以分离与气候变化有关的瞬时温度场；以及(4)综合分析地热和气象数据，以重建局部、区域和全球尺度的气候变化。

Chapman and Harris0126029Temperature-depth profiles measured in boreholes contain a temporal record of past changes in surface ground temperature (SGT) and provide valuable constraints on climatic variations over the last few centuries. Although much has been learned in the last two decades about the subject "geothermics of climate change" there are important questions remaining. What regions of the continents are experiencing transient ground warming, and by how much? What are baseline temperatures at the time of the industrial revolution prior to the instrumental record of global warming? What is the relationship between air and ground temperature over time scales appropriate to climate change studies? What is the sensitivity of surface ground temperature change to climatic parameters such as solar radiation, precipitation, and snow cover? What are the significant factors impacting comparisons between geothermal data and meteorological surface air temperature (SAT) records? How much heat is being stored in the outer layers of Earth as a result of 20th Century warming? This project will answer these questions by developing methods for and performing analyses in the geothermics of climate change. The study entails four interrelated tasks: (1) operation of a real-time surface observatory (weather station at a borehole site) to monitor meteorologic variables and near-surface temperature; (2) data analysis making quantitative estimates of the effects of solar variations, snow, and precipitation effects on ground temperatures; (3) repeat temperature logging in selected boreholes to isolate transient temperature fields associated with climate change; and (4) combined analysis of geothermal and meteorologic data to reconstruct climate change at local, regional, and global scales.