Pacific Paleoclimate from Reef Corals in the Eastern and Western Margins: Records from Galapagos, Cocos Island and the Gulf of Papua

摘要ATM-9308300沈，格伦T。 太平洋东部和西部边缘珊瑚礁的古气候：来自加拉帕戈斯、科科斯岛和巴布亚湾的记录 该奖项将支持一项旨在利用现有最佳珊瑚样本描述东太平洋过去400年来古气候特征的研究，并寻求在远西太平洋建立一种新的地球化学示踪剂-该区域目前几乎没有海洋气候指标。 东太平洋重建的焦点将是加拉帕戈斯群岛（0.5oS，91 oW）和科科斯岛（5.3oN，86.9oW）。 利用电感耦合等离子体质谱仪（ICP-MS）进行的关键测量是珊瑚石中钡：钙的比例，这是上升流和河流放电的敏感指标。 记录跨越270年（科科斯）和400年（加拉帕戈斯）的长度将产生在季度一年的决议。 此外，还将每年测定Cd/Ca和Mn/Ca。 澳大拉西亚区域降水指数的开发工作将涉及确定巴布亚湾100年珊瑚芯中的Ba/Ca比值，该地区明显受到富含Ba的大陆径流的影响。 这项工作的目标是开发与气候相关的数据集，这些数据集在长度上超过仪器记录，但保留了世纪后期测量的质量。 这些记录将使人们能够更仔细地研究似乎是低层大气和上层海洋特征的周期性周期（例如每年、两年和三至七年的厄尔尼诺/南方涛动时间尺度），并可能揭示存在更长时间尺度的变化。

Abstract ATM-9308300 Shen, Glen T. Title: Pacific Paleoclimate from Reef Corals in the Eastern and Western Margins: Records from Galapagos, Cocos Island and the Gulf of Papua This award will support a study designed to characterize the paleoclimate of the eastern Pacific over the last 400 years using the best available coral samples and seeks to establish a new geochemical tracer in the far western Pacific - a region for which few marine climatic indicators presently exist. The foci of the eastern Pacific reconstructions will be the Galapagos Islands (0.5oS, 91oW) and Cocos Island (5.3oN, 86.9oW). The ratio of barium:calcium in coral argonite, a sensitive indicator of upwelling and fluvial discharge, will be the key measurement using an Inductively-Coupled Plasma Mass Spectrometer (ICP-MS). Records spanning 270- (Cocos) and 400-years (Galapagos) length will be produced at quarter-annual resolution. Additionally, annual determinations of Cd/Ca and Mn/Ca will be made . Developmental effort for a regional precipitation index over Australasia will involve determination of Ba/Ca ratios in a 100- year coral core from the Gulf of Papua, an area markedly influenced by Ba-enriched continental runoff. The goal of this work is the development of climatically-relevant datasets which surpass the instrumental record in length yet retain the quality of latter 20th century measurements. Such records will allow a closer examination of recurrent periods (e.g annual, biennial, and three-to-seven year ENSO timescales) which appear to characterize the lower atmosphere and upper ocean, and may reveal the existence of longer time scale variations.