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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

基本信息

批准号：
1003610
负责人：
Thomas Guilderson
金额：
$ 7.86万
依托单位：
University of California-Santa Cruz
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 2014-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1003610&HistoricalAwards=false
关键词：
Influence Indonesian Throughflow western Indian

项目摘要

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.

热带温跃层对持续的温室气体强迫的动力响应是影响未来海洋变暖演变的主要反馈之一，根据古记录了解这种响应的过去变异性对于用全球海洋/大气模式准确模拟未来的变化至关重要。印度尼西亚贯流对西印度洋温跃层的影响在气候模型中很少被明确考虑，尽管它代表着热量和能量的大量转移。该项目的目的是分析多个同时代板岩样品中稳定同位素、微量元素和放射性碳的变化趋势，以得出20世纪热带印度洋西部温跃层变化的可靠的、每两年一次的重建。将放射性碳趋势与稳定的同位素/微量元素趋势进行比较，将有助于确定印度尼西亚贯穿流的特征或强度在多大程度上对推断的温跃层变化负责。这项研究将产生有价值的基线数据，用于评估目前和未来人为环境变化对深海珊瑚礁动物的影响。该奖项支持一名研究生的论文研究，以及与斯克里普斯的桦树水族馆合作的外展努力。