Borehole Temperatures and Climate Change

人们早就认识到，地球表面的温度变化会传播到地下，但会随着深度的增加而出现幅度衰减和时间延迟。因此，对热流的修正有时会计算更新世冰期的影响，并且可以在一些地热记录中发现10世纪和11世纪的小气候最佳期和17世纪和18世纪的小冰期的影响。许多钻孔温度剖面显示，最上层100米的温度梯度变化可能是由过去一个世纪以来地表温度的长期变化所驱动的。该项目的目的是使四个地热实验室（密歇根大学、北达科他大学、犹他大学、南卫理公会大学）能够查询和分析各自的钻孔温度档案，以获取与全球气候变化问题有关的数据。这些档案包含了来自美国和赤道以南非洲的大量数据。

It has long been recognized that temperature changes at the earth's surface are propagated into the subsurface but with an amplitude attenuation and time delay that increase with depth. Thus corrections to heat flow are sometimes calculated for the effect of the Pleistocene ice ages, and the effects of the Little Climatic Optimum of the 10th and 11th centuries and the Little Ice Age of the 17th and 18th centuries may be detected in some geothermal records. Many borehole temperature profiles show changes in the temperature gradient in the uppermost 100m that may be driven by a secular change of surface temperature over the past century. The purpose of this project is to enable four geothermal laboratories (University of Michigan, University of North Dakota, University of Utah, Southern Methodist University) to interrogate and analyze their respective borehole temperature archives for data relevant to questions of global climate change. These archives contain extensive data from the USA and Africa south of the equator.