The last deglacial sea-level and climatic changes. Coral Reef records in the south Pacific : Tahiti (French Polynesia) - IODP Expedition #310 -, Australian Great Barrier Reef - IODP Proposal #519: Potential of diagenetically altered corals for sub-seasona

末次冰消期海平面与气候变化。

• 批准号: 35880301
• 负责人: Professor Dr. Wolf-Christian Dullo
• 金额: --
• 依托单位: GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/35880301?language=en
• 关键词: last; deglacial; sea; level; climatic

The timing and course of the last deglaclation (23.000-6,000 calendar years BP - cal. yr BP) are essential components for understanding the dynamics of large Ice sheets and their effects on Earth's isostasy as well as the complex relationship between freshwater fluxes to the ocean, thermohaline circulation and, hence, global climate during the Late Pleistocene and the Holocene. This proposal Is related to the IODP proposal #519 concerning the coral reef records of Tahiti and the Australian Great Barrier Reef to establish the course of sea-level rise, climate variability and reef response during the last deglaciatton. It includes : 1) the study of more than 600 m of reef cores with an exceptional recovery that were retrieved from 37 holes ranging from 40 to 120 m water depth around Tahiti during the IODP Expedition 0310 « Tahiti Sea Level ». Distinctive levels of relict reefs covering most, if not all, the last deglaciation were drilled and therefore confirmed the significance of these features as unique archives of abrupt global sea-level rise and climate change. 2) Complimentary investigations of the Tahiti reef slopes, and 3) a site survey cruise on the Great Barrier Reef to generate high resolution bathymetric and seismic data that will be used to select suitable targets for an IODP drilling expedition corresponding to the part 2 of the IODP drilling proposal #519. The general scientific objectives of this proposal are threefold :a. To establish the course of post-glacial sea-level rise during the Last Deglaclation .b. To define SSTs and SSSs variations during the Last Deglaciation when solar insolation, sea level, and atmospheric CO2 levels were different from today. c. To analyze the impact of sea-level and environmental changes on reef development during the Last Deglaciation, with a special emphasis on the comprehensive reconstruction of environmental changes.

最后一次消冰作用的时间和过程（23.000-6,000历年BP - cal.yr BP）是了解大冰盖的动态及其对地球均衡性的影响以及晚更新世和全新世期间淡水流入海洋、温盐环流以及全球气候之间的复杂关系的重要组成部分。该提案与 IODP 提案 #519 有关，该提案涉及塔希提岛和澳大利亚大堡礁的珊瑚礁记录，旨在确定上次冰消期期间海平面上升、气候变化和珊瑚礁响应的过程。它包括：1) 对超过 600 m 的珊瑚礁核心进行了研究，这些珊瑚礁核心的回收率非常高，这些珊瑚礁核心是在 IODP 0310“塔希提海平面”探险期间从塔希提岛周围 40 至 120 m 水深的 37 个孔中回收的。钻探了覆盖大部分（如果不是全部）最后一次冰消期的不同程度的遗迹珊瑚礁，因此证实了这些特征作为全球海平面突然上升和气候变化的独特档案的重要性。 2) 对塔希提岛珊瑚礁斜坡进行免费调查，以及 3) 在大堡礁进行现场勘察巡航，以生成高分辨率测深和地震数据，这些数据将用于为 IODP 钻探探险选择合适的目标，对应于 IODP 钻探提案 #519 的第 2 部分。该提案的总体科学目标有三个：确定末次冰消期期间冰期后海平面上升的过程。定义末次冰消期期间太阳辐射、海平面和大气二氧化碳水平与今天不同时的海温和海温变化。 c.分析末次冰消期海平面和环境变化对珊瑚礁发育的影响，特别注重环境变化的综合重建。