Collaborative Research: Uncovering the Ross Ocean and Ice Shelf Environment and Tectonic setting Through Aerogeophysical Surveys and Modeling (ROSETTA-ICE)

合作研究：通过航空地球物理调查和建模揭示罗斯海洋和冰架环境和构造环境（ROSETTA-ICE）

• 批准号: 1443497
• 负责人: Christine Siddoway
• 金额: $ 15.51万
• 依托单位: Colorado College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-15 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1443497&HistoricalAwards=false
• 关键词: Collaborative; Research; Uncovering; Ross; Ocean

The Ross Ice Shelf is the largest existing ice shelf in Antarctica, and is currently stabilizing significant portions of the land ice atop the Antarctic continent. An ice shelf begins where the land ice goes afloat on the ocean, and as such, the Ross Ice Shelf interacts with the ocean and seafloor below, and the land ice behind. Currently, the Ross Ice Shelf slows down, or buttresses, the fast flowing ice streams of the West Antarctic Ice Sheet (WAIS), a marine-based ice sheet, which if melted, would raise global sea level by 3-4 meters. The Ross Ice Shelf average ice thickness is approximately 350 meters, and it covers approximately 487,000 square kilometers, an area slightly larger than the state of California. The Ross Ice Shelf has disappeared during prior interglacial periods, suggesting in the future it may disappear again. Understanding the dynamics, stability and future of the West Antarctic Ice Sheet therefore requires in-depth knowledge of the Ross Ice Shelf. The ROSETTA-ICE project brings together scientists from 4 US institutions and from the Institute of Geological and Nuclear Sciences Limited, known as GNS Science, New Zealand. The ROSETTA-ICE data on the ice shelf, the water beneath the ice shelf, and the underlying rocks, will allow better predictions of how the Ross Ice Shelf will respond to changing climate, and therefore how the WAIS will behave in the future. The interdisciplinary ROSETTA-ICE team will train undergraduate and high school students in cutting edge research techniques, and will also work to educate the public via a series of vignettes integrating ROSETTA-ICE science with the scientific and human history of Antarctic research.The ROSETTA-ICE survey will acquire gravity and magnetics data to determine the water depth beneath the ice shelf. Radar, LIDAR and imagery systems will be used to map the Ross Ice Shelf thickness and fine structure, crevasses, channels, debris, surface accumulation and distribution of marine ice. The high resolution aerogeophysical data over the Ross Ice Shelf region in Antarctica will be acquired using the IcePod sensor suite mounted externally on an LC-130 aircraft operating from McMurdo Station, Antarctica. Field activities will include ~36 flights on LC-130 aircraft over two field seasons in Antarctica. The IcePod instrument suite leverages the unique experience of the New York Air National Guard operating in Antarctica for NSF scientific research as well as infrastructure and logistics. The project will answer questions about the stability of the Ross Ice Shelf in future climate, and the geotectonic evolution of the Ross Ice Shelf Region, a key component of the West Antarctic Rift system. The comprehensive benchmark data sets acquired will enable broad, interdisciplinary analyses and modeling, which will also be performed as part of the project. ROSETTA-ICE will illuminate Ross ice sheet-ice shelf-ocean dynamics as the system nears a critical juncture but still is intact. Through interacting with an online data visualization tool, and comparing the ROSETTA-ICE data and results from earlier studies, we will engage students and young investigators, equipping them with new capabilities for the study of critical earth systems that influence global climate.

罗斯冰架是南极洲现存最大的冰架，目前稳定着南极大陆上大部分的陆地冰。冰架开始于陆冰漂浮在海洋上的地方，因此，罗斯冰架与下面的海洋和海底以及后面的陆冰相互作用。目前，罗斯冰架减缓或支撑着南极西部冰盖（WAIS）快速流动的冰流，这是一个海洋冰盖，如果融化，将使全球海平面上升3-4米。罗斯冰架的平均冰厚约为350米，覆盖面积约为48.7万平方公里，面积略大于加利福尼亚州。罗斯冰架在之前的间冰期已经消失，这表明未来它可能会再次消失。因此，要了解南极西部冰盖的动态、稳定性和未来，就需要深入了解罗斯冰架。ROSETTA-ICE项目汇集了来自4个美国机构和新西兰地质与核科学研究所有限公司（即GNS科学）的科学家。ROSETTA-ICE关于冰架、冰架下面的水和下面的岩石的数据，将有助于更好地预测罗斯冰架对气候变化的反应，从而预测WAIS未来的表现。跨学科的ROSETTA-ICE团队将培训本科生和高中生掌握尖端的研究技术，并将通过一系列将ROSETTA-ICE科学与南极研究的科学和人类历史相结合的小短片来教育公众。ROSETTA-ICE调查将获取重力和磁力数据，以确定冰架下的水深。雷达、激光雷达和成像系统将用于绘制罗斯冰架的厚度和精细结构、裂缝、渠道、碎片、海洋冰的表面堆积和分布。南极洲罗斯冰架地区的高分辨率航空地球物理数据将通过安装在南极洲麦克默多站的LC-130飞机上的IcePod传感器套件获取。野外活动将包括在南极洲的两个野外季节，在LC-130飞机上进行约36次飞行。IcePod仪器套件利用了纽约空军国民警卫队在南极洲开展科学研究以及基础设施和后勤工作的独特经验。该项目将回答罗斯冰架在未来气候中的稳定性问题，以及罗斯冰架地区的地质构造演化，罗斯冰架地区是南极西部裂谷系统的关键组成部分。获得的综合基准数据集将实现广泛的跨学科分析和建模，这也将作为项目的一部分执行。罗塞塔-冰将阐明罗斯冰原-冰架-海洋的动力学，因为该系统接近一个关键节点，但仍然完好无损。通过与在线数据可视化工具进行交互，并比较ROSETTA-ICE数据和早期研究的结果，我们将吸引学生和年轻的研究人员，为他们提供研究影响全球气候的关键地球系统的新能力。

项目成果

Geology of West Antarctica

西南极洲地质

• 发表时间: 2021
• 期刊: Beiträge zur regionalen Geologie der Erde
• 作者: Siddoway, Christine Smith

Basement Topography and Sediment Thickness Beneath Antarctica's Ross Ice Shelf

南极洲罗斯冰架下方的地下室地形和沉积物厚度

• DOI: 10.1029/2021gl097371
• 发表时间: 2022
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Tankersley, M. D.;Horgan, H. J.;Siddoway, C. S.;Caratori Tontini, F.;Tinto, K. J.
• 通讯作者: Tinto, K. J.