Influence of the Indonesian Throughflow in the western Indian Ocean thermocline--the 20th century record from sclerosponges

印度尼西亚穿流对西印度洋温跃层的影响--20世纪硬海绵的记录

• 批准号: 1003615
• 负责人: Christopher Charles
• 金额: $ 16.08万
• 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: 2010
• 资助国家: 美国
• 起止时间: 2010-10-01 至 2013-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1003615&HistoricalAwards=false
• 关键词: Influence; Indonesian; Throughflow; western; Indian

The dynamical response of the tropical thermocline to continued greenhouse gas forcing represented one of the primary feedbacks influencing the future evolution of ocean warming, and understanding of past variability of this response based on paleo records is crucial for accurate simulation of future changes by global ocean/atmosphere models. The impact of the Indonesian Throughflow on the western Indian Ocean thermocline is rarely considered explicitly in climate models, despite the fact that it represents a substantial transfer of heat and energy. This project is aimed at analyzing trends in stable isotopes, trace elements, and radiocarbon in multiple coeval sclerosponge specimens to arrive at a robust, biennially resolved reconstruction of western tropical Indian Ocean thermocline change across the 20th century. The comparison of the radiocarbon trends with stable isotopic/trace element trends will help determine the extent to which the characteristics or strength of the Indonesian Throughflow (ITF) were responsible for the inferred thermocline changes. The research will generate valuable baseline data for assessing present and future impacts of anthropogenic environmental change on deep reef fauna. The award supports a graduate student's dissertation research, as well as outreach efforts in collaboration with the Birch Aquarium at Scripps.

热带热跃层对持续温室气体强迫的动态响应代表了影响海洋变暖未来演变的主要反馈之一，以及基于古记录对这种反应的过去变异性的理解对于准确模拟全球海洋/大气模型的未来变化至关重要。印度尼西亚人遍及印度洋热跃层的影响很少在气候模型中明确考虑，尽管它代表了热量和能量的大量转移。该项目的目的是分析多个同时的同位素，微量元素和放射性碳的趋势，以使整个20世纪西方热带印度海洋热跃层变化的强大的，两年一的分辨出的重建。与稳定的同位素/痕量元素趋势的放射性碳趋势的比较将有助于确定印尼遍布（ITF）的特征或强度在多大程度上导致了推断的热跃层变化。这项研究将产生有价值的基线数据，以评估人为环境变化对深礁动物区系的当前和未来影响。该奖项支持研究生的论文研究，以及与Scripps的桦木水族馆合作的推广工作。