High Precision Borehole Temperature Measurements at Siple Dome, Antarctica, for Paleoclimate Reconstruction and Ice Dynamics Studies

南极洲 Siple Dome 的高精度钻孔温度测量，用于古气候重建和冰动力学研究

基本信息

批准号：
9726078
负责人：
Edwin Waddington
金额：
$ 12.57万
依托单位：
University of Washington
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1998
资助国家：
美国
起止时间：
1998-04-01 至 2003-03-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9726078&HistoricalAwards=false
关键词：
Precision Borehole Temperature Measurements Siple

项目摘要

9726078 Waddington This award supports a project to obtain a number of high- precision borehole temperature profiles at Siple Dome for paleoclimate reconstruction and ice dynamics studies. Continuous temperature logs will be obtained in the 1 km deep fluid-filled Siple Dome borehole and in several 160 m deep holes along a 20 km north-south transect across Siple Dome. The borehole temperature data will be used to: a) establish the conductive heat flux across the basal interface of the ice sheet, b) reconstruct the surface temperature history at Siple Dome using geophysical inverse methods ("borehole paleothermometry"), c) constrain how thick the ice sheet was during the late Wisconsin, the magnitude of the Wisconsin/Holocene deglacial warming, and the background geothermal heat flux, d) determine the calibration constants for the oxygen-isotope paleothermometer at Siple Dome in the past, and e) establish the spatial variability of surface temperature on the 20 km scale near the main drill site during the last 100 years. The results at Siple Dome are expected to provide data needed to assess the short-term stability of the West Antarctic Ice Sheet, improve our understanding of the magnitude of past temperature changes at this southern hemisphere site, and lead to improved estimates of the pore close-off ages in the past which should lead to an improved age scale for the Siple Dome ice core.

9726078 Waddington 该奖项支持在 Siple Dome 获取大量高精度钻孔温度剖面的项目，用于古气候重建和冰动力学研究。将在 1 公里深的充满液体的 Siple Dome 钻孔和沿 Siple Dome 20 公里南北横断面的几个 160 m 深的孔中获得连续温度记录。钻孔温度数据将用于：a) 建立跨冰盖基底界面的传导热通量，b) 使用地球物理反演方法（“钻孔古测温法”）重建 Siple Dome 的表面温度历史，c) 限制如何威斯康星州晚期冰盖厚度、威斯康星州/全新世冰消变暖的幅度以及背景地热热通量，d) 确定氧同位素的校准常数过去在 Siple Dome 的古温度计，以及 e) 建立了过去 100 年来主钻探地点附近 20 公里范围内地表温度的空间变化。 Siple Dome 的结果预计将提供评估西南极冰盖短期稳定性所需的数据，提高我们对这一南半球地点过去温度变化幅度的了解，并改进对附近孔隙的估计。 - 过去的年龄应该会导致 Siple Dome 冰芯年龄范围的改善。