Collaborative Research: An Ice Core from Hercules Dome, East Antarctica

合作研究：南极洲东部大力神圆顶的冰芯

基本信息

批准号：
1841844
负责人：
Eric Steig
金额：
$ 68.15万
依托单位：
University of Washington
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-07-15 至 2027-06-30
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1841844&HistoricalAwards=false
关键词：
Collaborative Research Ice Core Hercules

项目摘要

The goal of this project is to drill and recover an ice core from Hercules Dome, Antarctica. The geographic setting of Hercules Dome makes it well-situated to investigate changes in the size of the West Antarctic ice sheet over long time periods. The base of the West Antarctic ice sheet lies below sea level, which makes this part of Antarctica vulnerable to melting from the relatively warm deep water of the Southern Ocean. An important research question is whether the West Antarctic Ice Sheet collapsed during Earth's last prolonged warm period, about 125,000 years ago, when the ocean was warmer and sea level was several meters higher than today. Evidence for or against such a collapse will be recorded in the chemistry and physical properties of the ice. The Hercules Dome ice core will be obtained over three to four field seasons in Antarctica using efficient drilling technology. This grant includes support for project management, pre-drilling science community engagement, ice-core recovery, and education and outreach activities. Hercules Dome is located at the edge of the East Antarctic ice sheet, south of the Transantarctic Mountains at 86 degrees South, 105 degrees West. Glaciological conditions at Hercules Dome are simple, with well-defined layering to the bed, optimal for the recovery of a deep ice core reaching to the last interglacial period at depths between 1600 and 2800 meters. An ice core from Hercules Dome will provide a research opportunity for ice-core analysts and others to make progress on a number of science priorities, including the environmental conditions of the last interglacial period, the history of gases and aerosols, and the magnitude and timing of changes in temperature and snow accumulation over the last 150,000 years. Together with the network of ice cores obtained by U.S. and international researchers over the last few decades, results from Hercules Dome will yield improved estimates of the boundary conditions necessary for the implementation and validation of ice-sheet models critical to the projection of future Antarctic ice-sheet change and sea level.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该项目的目标是钻探并回收南极洲大力神圆顶的冰芯。大力神圆顶的地理环境使其处于有利位置，可以研究南极西部冰盖在长期内的大小变化。南极西部冰盖的底部位于海平面以下，这使得南极洲的这一部分很容易被南大洋相对温暖的深水融化。一个重要的研究问题是，西南极冰盖是否在地球最后一个长期温暖时期（大约 125,000 年前）崩塌，当时海洋变暖，海平面比今天高出几米。支持或反对这种崩塌的证据将记录在冰的化学和物理特性中。 Hercules Dome 冰芯将使用高效的钻探技术在南极洲经过三到四个野外季节获得。这笔赠款包括对项目管理、钻前科学界参与、冰芯恢复以及教育和外展活动的支持。大力神穹顶位于东南极冰盖边缘，横贯南极山脉以南，南纬86度，西经105度。 Hercules Dome 的冰川条件简单，床层层次分明，最适合恢复深度在 1600 米至 2800 米之间、直至最后间冰期的深层冰芯。来自大力神穹顶的冰芯将为冰芯分析师和其他人提供研究机会，以便在许多科学优先事项上取得进展，包括最后一个间冰期的环境条件、气体和气溶胶的历史以及规模和时间过去 15 万年的温度和积雪变化。加上美国和国际研究人员在过去几十年中获得的冰芯网络，大力神圆顶的结果将改进对实施和验证冰盖模型所需的边界条件的估计，这对未来南极冰的预测至关重要-纸张变化和海平面。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。