Revealing Late Holocence Climate Variability in Antarctica from Borehole Paleothermometry

ALLY/1142085该奖项支持一个项目，该项目将继续收集和分析2007至2009年间部署在东南极Dronning Maud地段的三个自动降雪温度剖面仪的降雪温度数据，这是挪威-美国IPY导线项目的一部分。该项目的智能优点是：1)约束和改进钻孔古温度测量所需的降雪热物性(导热系数和比热容)的参数化；2)研究自部署热剖面仪以来降雪温度的变化，并得出该时期的地表温度趋势；3)比较和对比过去30年由测量的降雪温度和卫星热红外数据得出的地表温度及其趋势。该项目还涉及购买和部署一个自动化系统，以记录富士穹顶浅孔顶部16米处多个深度的瞬时温度，以提供有用的数据，并准备在不久的将来对富士穹顶现有的深孔(3035米)和浅孔(112米)进行温度记录。浅钻孔的准备和自动化系统的安装将由日本南极考察队(JARE)的合作者在2012-13年南极野外考察季节进行。这个自动化系统收集的数据将用于限制富士穹顶上层降雪层的热性质，并与其他地点的数据进行比较，从而扩大这些研究的地理范围。该项目的更广泛影响包括在科学会议上介绍成果和在同行评议的期刊上发表成果。公众宣传将包括与科学教师和中学生进行有针对性的工作。

Alley/1142085This award supports a project to continue the collection and analyses of firn temperature data from three automated firn thermal profiling units deployed in Dronning Maud Land sector of East Antarctica as part of the Norway-US IPY Traverse project between 2007 and 2009. The intellectual merits of this project are as follows: 1) to constrain and improve the parameterization of firn thermal properties (thermal conductivity and specific heat capacity) that are required for the borehole paleothermometry, 2) to study the change in firn temperature since the deployment of thermal profiling units ~5 years ago and derive the surface temperature trend for that time period, and 3) to compare and contrast the surface temperatures and their trends derived from the measured firn temperatures and satellite thermal infrared data for the past three decades. The project also involves acquiring and deploying an automated system to record transient temperatures at multiple depths in the top 16 meters of the shallow borehole at Dome Fuji, to provide useful data and to prepare for the possibility of conducting temperature-logging in the existing deep (3035 m) and shallow (112 m) boreholes at Dome Fuji in the near future. The preparation of the shallow borehole and the installation of the automated system will be carried out by collaborators from the Japanese Antarctic Research Expedition (JARE) in 2012-13 Antarctic field season. The data collected by this automated system will be used to constrain the thermal properties of upper firn layer at Dome Fuji, as well as comparing with data from other sites, increasing the geographic extent of these studies. The broader impacts of the project include presentation of results at scientific conferences and publication of results in peer-reviewed journals. Public outreach will include targeted work with science teachers and middle school students.