Seasonal to interannual climate variability in the tropical southwest Pacific during the last deglaciation - Monthly resolved reconstructions from Great Barrier Reef corals

上次冰消期期间热带西南太平洋的季节性到年际气候变化 - 大堡礁珊瑚的每月解析重建

• 批准号: 180346848
• 负责人: Dr. Thomas Felis
• 金额: --
• 依托单位: Department of Earth Sciences
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2011-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/180346848?language=en
• 关键词: Seasonal; interannual; climate; variability; tropical

I suggest reconstructing the range of seasonality and interannual climate variability during the last deglaciation in the tropical southwest Pacific Ocean, by analysing the skeletons of annually-banded corals from the Great Barrier Reef. The corals will be recovered by IODP Expedition 325 (February 2010), a Mission Specific Platform Expedition conducted by the European Consortium for Ocean Research Drilling (ECORD). The analyses of Sr/Ca and oxygen isotope ratios in fossil corals will provide monthly resolved reconstructions of temperature and hydrologic balance at the sea surface for time windows of several decades, robustly resolving the annual cycle. These coral records, for the first time, will allow quantifying changes in the amplitude of seasonality and interannual climate variability in the tropical southwest Pacific that occurred from 20,000 to 10,000 years ago. Furthermore, the project can provide unique insights into the dynamics of natural modes of atmosphere-ocean variability on interannual timescales, such as the El Niño-Southern Oscillation and possibly the Indian Ocean Dipole, under boundary conditions different from today. Comparing such ultrahigh-resolution coral-based snapshots of last deglacial climate variability with state-ofthe- art climate model simulations will help to assess the validity of future greenhouse projections on timescales relevant for society. The suggested project addresses a major scientific objective of IODP Expedition 325.

我建议通过分析大堡礁年际带状珊瑚的骨骼，重建热带西南太平洋最后一次冰川消退期间的季节性和年际气候变化范围。这些珊瑚将由IODP考察队325（2010年2月）回收，这是一个由欧洲海洋研究钻探联盟（ECORD）进行的任务特定平台考察队。对化石珊瑚中Sr/Ca和氧同位素比值的分析将提供几十年时间窗内海面温度和水文平衡的月度分辨重建，有力地解决了年循环问题。这些珊瑚记录将首次使我们能够量化2万至1万年前热带西南太平洋地区的季节性变化幅度和年际气候变化。此外，该项目可以提供独特的见解，以了解年际时间尺度上大气-海洋变化的自然模式的动力学，例如El Niño-Southern振荡和可能的印度洋偶极子，在不同于今天的边界条件下。将这种基于珊瑚的最后一次去冰期气候变率的超高分辨率快照与最先进的气候模式模拟进行比较，将有助于评估未来温室效应预测在与社会相关的时间尺度上的有效性。建议的项目解决了IODP远征325的主要科学目标。

项目成果

IODP Expedition 325: Great Barrier Reefs Reveals Past Sea-Level, Climate and Environmental Changes Since the Last Ice Age

• DOI: 10.2204/iodp.sd.12.04.2011
• 发表时间: 2011-09
• 期刊: Scientific Drilling
• 影响因子: 1.2
• 作者: C. Cotterill;Juan Carlos Braga;L. Jovane;Heath Mills;Sally Morgan;A. Suzuki