Geochemical Calibration of Modern Isopora and Acropora Corals from the Great Barrier Reef and Application to IODP Leg 325 Fossil Corals

大堡礁现代等孔珊瑚和鹿角珊瑚的地球化学校准及其在 IODP Leg 325 化石珊瑚中的应用

• 批准号: 1356948
• 负责人: Braddock Linsley
• 金额: $ 18.38万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-05-01 至 2017-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1356948&HistoricalAwards=false
• 关键词: Geochemical; Calibration; Modern; Isopora; Acropora

In 2010, Integrated Ocean Drilling Project Leg 325 (IODP325) cored drowned fossil reefs off the Great Barrier Reef with the objective of collecting fossil corals that would yield information about past sea levels, ocean temperatures, and ocean chemistry. Massive coral colonies up to ~40 cm in length were the main types of coral recovered during IODP325 with ages spanning the last glacial maximum to the earliest part of the modern warm period (~30,000 to 10,000 years B.P.). Today these corals (Isopora and Acropora species) grow in relatively high-energy environments but little is known about their potential to support paleoceanographic reconstructions since these genera have not been previously used for this purpose. To address this issue and fully utilize the collected coral cores, this research is designed to develop sampling protocols and calibrations between modern oceanographic temperature and salinity data and skeletal oxygen isotopes and strontium/calcium in modern Isopora and Acropora corals from the Great Barrier Reef. Previously collected modern Isopora and Acropora corals from Heron Island, Myrmidon Reef and New Guinea will be analyzed. In the second part of this work the developed calibrations and sampling protocols will be applied to the fossil corals collected as part of IODP325 to generate more accurate temperature and salinity reconstructions. Because the geochemistry of Isopora and Acropora corals has not been previously calibrated against modern data, this project will directly assist all researchers using IODP325 fossil corals working to answer questions about sea level and sea surface temperature in the climatically important Western Pacific Warm Pool. This work will also provide a sound basis for comparisons with analogous studies using other corals in other localities and habitats (e.g., IODP Leg 310 in Tahiti). The project will support a female graduate student at the Lamont-Doherty Earth Observatory.

2010年，综合海洋钻井项目腿325（IODP325）尸体淹没了大障碍礁的化石珊瑚礁，目的是收集化石珊瑚，这些珊瑚将产生有关过去海平面，海洋温度和海洋化学的信息。长度高达约40厘米的巨大珊瑚菌落是IODP325期间回收的主要类型，年龄跨越了最后的冰川最大值到现代温暖时期的最早部分（约30,000至10，000年）。如今，这些珊瑚（Isopora和Acropora物种）在相对较高的能量环境中生长，但对它们支持古环境重建的潜力知之甚少，因为这些属以前尚未用于此目的。为了解决这个问题并充分利用收集的珊瑚核心，该研究旨在开发现代海洋温度和盐度数据之间的采样方案和校准，以及现代Isopora和Actropora珊瑚的骨骼氧和骨氧同位素和斜角/钙。将分析以前从Heron岛，Myrmidon Reef和New Gerinea收集的现代Isopora和Acropora Corals。在这项工作的第二部分中，开发的校准和采样方案将应用于IODP325的一部分收集的化石珊瑚，以生成更准确的温度和盐度重建。由于Isopora和Acropora Corals的地球化学以前尚未针对现代数据进行校准，因此该项目将直接使用IODP325化石珊瑚帮助所有研究人员，以回答有关在气候上重要的西太平洋温暖池中有关海平面和海面温度的问题。 这项工作还将为使用其他地方和栖息地的其他珊瑚进行类似研究的比较提供合理的基础（例如，塔希提岛的IODP腿310）。该项目将支持Lamont-Doherty Earth天文台的女研究生。