Revealing Late Holocence Climate Variability in Antarctica from Borehole Paleothermometry

从钻孔古体温测量揭示南极洲晚全新世气候变化

• 批准号: 1142085
• 负责人: Atsuhiro Muto
• 金额: $ 18.51万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-07-01 至 2016-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1142085&HistoricalAwards=false
• 关键词: Revealing; Late; Holocence; Climate; Variability

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.

Alley/1142085该奖项支持一个项目，该项目继续收集和分析来自 2007 年至 2009 年间部署在东南极洲 Dronning Maud 地段的三个自动雪恩热剖面仪的雪恩温度数据，作为挪威-美国 IPY Traverse 项目的一部分。该项目的优点如下： 1）约束和改进firn热性能（导热系数和比热容）的参数化，这些参数是钻孔古温度测量所需的，2）研究自约 5 年前部署热剖面仪以来的温度变化，并得出该时间段的地表温度趋势，以及 3）比较和对比地表温度及其趋势根据过去三十年测量的气温和卫星热红外数据得出。该项目还涉及获取和部署一个自动化系统，记录富士穹顶浅钻孔顶部 16 米多个深度的瞬态温度，以提供有用的数据，并为在现有深度进行温度记录的可能性做好准备（不久的将来，将在 Dome Fuji 进行 3035 m）和浅钻孔（112 m）。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 南极野外季节进行。该自动化系统收集的数据将用于限制富士圆顶上层雪层的热特性，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。该项目更广泛的影响包括在科学会议上展示结果以及在同行评审期刊上发表结果。公共宣传活动将包括针对科学教师和中学生的有针对性的工作。