The last deglacial sea-level & climate changes.Coral reef records in Checreef: South Pacific: Tahiti (French Polynesia) IODP expedition

最后一次冰川消融的时间和过程(公元23,000-6,000历年)。对于了解大冰盖的动力学及其对地球均衡的影响，以及了解流入海洋的淡水通量、温盐环流之间的复杂关系，从而了解晚更新世和全新世期间的全球气候，都是必不可少的组成部分。这项提案涉及IODP关于大溪地和澳大利亚大堡礁珊瑚礁记录的519号提案，以确定海平面上升的过程、气候变化和上次冰川消融期间的珊瑚礁反应。它包括：1)研究600多米的珊瑚礁岩芯，这些岩芯是在IODP#310“塔希提海平面”探险期间从塔希提岛周围从40到120米水深的37个洞中打捞出来的，具有特殊的恢复能力。钻探了覆盖最后一次冰川消融的大部分(如果不是全部)的独特级别的残留生物礁，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)对塔希提岛礁石斜坡进行免费勘测；3)在大堡礁进行现场勘测，以生成高分辨率的水深和地震数据，用于根据IODP钻探提案#519第2部分为IODP钻探探险选择合适的目标。这项建议的总体科学目标有三个：a.确定最后一次冰川消融期间冰川后海平面上升的过程。B.确定在最后一次冰川消融期间，当太阳辐射、海平面和大气二氧化碳水平与今天不同时，海温和SSSS的变化。C.分析末次冰川消退期间海平面和环境变化对生物礁发育的影响，重点是环境变化的综合重建。

The timing and course of the last deglaciation (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 deglaciation. 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 #310 '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 Deglaciation . 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.