Early Grant in Exploratory Research: Acquisition and analysis of sediment cores from the eastern tropical Indian Ocean

探索性研究的早期资助：东热带印度洋沉积物岩心的采集和分析

• 批准号: 1400860
• 负责人: Christopher Charles
• 金额: $ 3.53万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-12-01 至 2015-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1400860&HistoricalAwards=false
• 关键词: Early; Grant; Exploratory; Research; Acquisition

The dynamics of the tropical Indian Ocean represent a major wildcard in the projections of many large-scale aspects of the climate system. In principle, the strength of the South Asian monsoon, the inter-ocean linkages of interannual-centennial variability throughout the tropics, and the expression of greenhouse gas induced warming of the upper ocean must all be influenced by, or mediated through the tropical thermocline. Despite its importance, there are a number of first order questions about the dynamics and variability in this system that remain unanswered.The primary objective of this work is to collect and analyze sediment cores from an under-sampled region with the eventual goal of resolving the mid- to upper tropical Indian Ocean dynamics over ice age cycles. The project takes advantage of a student training expedition that will focus primarily on geophysical mapping of the Sunda Arc, but also allow ample time for surveying and gravity coring of nearby areas. Follow-on work will include laboratory-based analysis of the those sediment cores to establishstratigraphic context and to test the potential of new methods (e.g., individual foraminiferal analysis) for addressing the overall objectives of the project.The primary broader impact of this project lies in the exceptional opportunity for heuristic student training in oceanographic sample and data collection. Students will experience the sediment coring process from start to finish--from the strategic design of the cruise plan, through the shipboard execution of gravity coring, and ultimately to the scientific applications. The outcomes of the coring and surveys will also provide the basis for larger basin-wide initiatives to study long-timescale tropical climate change.

热带印度洋的动力是在气候系统许多大规模方面预测中的主要通配符。原则上，南亚季风的强度，整个热带地区的年度纪念日变异性的海上连接，以及温室气体引起的上海变暖的表达都受到热带温跃层的影响或介导的。尽管它很重要，但有关该系统中的动态和可变性的一阶问题仍未得到答复。这项工作的主要目标是收集和分析来自采样不足的地区的沉积物核心，最终是解决中期到上层热带印度海洋动力学的目标。该项目利用了学生培训探险，该探险将主要集中于Sunda Arc的地球物理图，但还可以让大量时间进行附近地区的测量和重力加油。后续工作将包括基于实验室的沉积物核心分析，以建立StrataTraphic环境，并测试新方法的潜力（例如，个体有孔虫分析）来解决该项目的整体目标。该项目的主要广泛影响在于，在大洋洲样本和数据收集中启发式学生培训的非凡机会。从头到尾，学生将体验到沉积物的进料过程 - 从船上执行重力加油的战略设计，最终到科学应用。训练和调查的结果还将为较大的盆地范围倡议提供基础，以研究长时间的热带气候变化。