Holocene Paleoenvironmental Change Along the Antarctic Peninsula: A Test of the Bi-Polar/Solar Signal

南极半岛全新世古环境变化：双极/太阳信号测试

• 批准号: 9615668
• 负责人: Robert Dunbar
• 金额: $ 4.2万
• 依托单位: William Marsh Rice University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-06-15 至 1999-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9615668&HistoricalAwards=false
• 关键词: Holocene; Paleoenvironmental; Change; Along; Antarctic

Domack: OPP 9615053 Manley: OPP 9615670 Banerjee: OPP 9615695 Dunbar: OPP 9615668 Ishman: OPP 9615669 Leventer: OPP 9714371 Abstract This award supports a multi-disciplinary, multi-institutional effort to elucidate the detailed climate history of the Antarctic Peninsula during the Holocene epoch (the last 10,000 years). The Holocene is an important, but often overlooked, portion of the Antarctic paleoclimatic record because natural variability in Holocene climate on time scales of decades to millennia can be evaluated as a model for our present "interglacial" world. This project builds on over ten years of prior investigation into the depositional processes, productivity patterns and climate regime of the Antarctic Peninsula. This previous work identified key locations that contain ultra-high resolution records of past climatic variation. These data indicate that solar cycles operating on multi-century and millennial time scales are important regulators of meltwater production and paleoproductivity. These marine records can be correlated with ice core records in Greenland and Antarctica. This project will focus on sediment dispersal patterns across the Palmer Deep region. The objective is to understand the present links between the modern climatic and oceanographic systems and sediment distribution. In particular, additional information is needed regarding the influence of sea ice on the distribution of both biogenic and terrigenous sediment distribution. Sediment samples will be collected with a variety of grab sampling and coring devices. Analytical work will include carbon-14 dating of surface sediments using accellerator mass spectrometry and standard sedimentologic, micropaleontologic and magnetic granulometric analyses. This multiparameter approach is the most effective way to extract the paleoclimatic signals contained in the marine sediment cores. Two additional objectives are the deployment of sediment traps in front of the Muller Ice Shelf in Lallemand Fjord and seismic reflection work in conjunction with site augmentation funded through the Joint Oceanographic Institute. The goal of sediment trap work is to address whether sand transport and deposition adjacent to the ice shelf calving line results from meltwater or aeolian processes. In addition, the relationship between sea ice conditions and primary productivity will be investigated. The collection of a short series of seismic lines across the Palmer Deep basins will fully resolve the question of depth to acoustic basement. The combination of investigators on this project, all with many years of experience working in high latitude settings, provides an effective team to complete the project in a timely fashion. A combination of undergraduate, graduate and post-graduate students will be involved in all stages of the project so that educational objectives will be met in-tandem with research goals of the project.

Domack: OPP 9615053 Manley: OPP 9615670 Banerjee: OPP 9615695 Dunbar: OPP 9615668 Ishman: OPP 9615669 Leventer: OPP 9714371 Abstract This award supports a multi-disciplinary, multi-institutional effort to elucidate the detailed climate history of the Antarctic Peninsula during the Holocene epoch （最近10,000年）。 全新世是南极古气候记录的重要但经常被忽视的部分，因为可以在数十年的时间尺度上自然变化到千年来，可以作为我们当前的“冰川间”世界的模型进行评估。 该项目基于对南极半岛的沉积过程，生产力模式和气候状态的事先调查。 这项先前的工作确定了包含过去气候变化的超高分辨率记录的关键位置。 这些数据表明，在多世纪和千禧一代时间尺度上运行的太阳循环是融合产生和古生物生产力的重要调节剂。 这些海洋记录可以与格陵兰和南极洲的冰核记录相关。 该项目将集中于整个帕尔默深区的沉积物分散模式。 目的是了解现代气候和海洋学系统与沉积物分布之间的当前联系。 特别是，需要有关海冰对生物沉积物分布分布的影响的其他信息。 将采用各种抢次采样和芯芯来收集沉积物样品。 分析工作将包括使用加速器质谱法和标准沉积学，微生气生产和磁性颗粒计分析的碳14年代表面沉积物。 这种多参数方法是提取海洋沉积物芯中包含的古气候信号的最有效方法。 另外两个目标是在拉勒曼德峡湾的穆勒冰架前部署沉积物陷阱，以及通过联合海洋学研究所资助的现场增强作用的地震反射工作。 沉积物陷阱工作的目的是解决与冰架产排线相邻的沙子运输和沉积，这是由融化或风水过程引起的。 此外，将研究海冰条件与主要生产率之间的关系。 在帕尔默深层盆地上的一系列地震线的集合将完全解决深度问题到声学的地下室。 研究人员在该项目上的结合以及在高纬度设置中工作的多年经验提供了一个有效的团队，以及时完成该项目。 本科生，研究生和研究生的结合将参与该项目的各个阶段，以便以该项目的研究目标在坦德姆实现教育目标。