Climate Instability during the Last Interglacial

末次间冰期气候不稳定

• 批准号: NE/G00756X/1
• 负责人: Polychronis Tzedakis
• 金额: $ 21.39万
• 依托单位: University College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2009
• 资助国家: 英国
• 起止时间: 2009 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FG00756X%2F1
• 关键词: Climate; Instability; during; Last; Interglacial

The Last Interglacial was characterized by the highest peak temperatures and sea level of at least the past 250,000 years, caused by increased Northern Hemisphere summer insolation and ocean- and land-feedbacks. Though not a strict analogue for future global projections, the Last Interglacial provides an invaluable observational context for climate instability during periods of 'excess' warmth. While a number of marine and terrestrial records suggest the presence of climate instability during the Last Interglacial, chronological uncertainties complicate an assessment of the local or regional significance of reported events. This projects aims to produce a 'stratigraphical Rosetta Stone' linking reconstructions of deep- and surface-water hydrography with regional vegetation change in the same deep-sea sequence from the south Portuguese margin; a key area for linking marine and terrestrial records and tracing millennial-scale variability. The increased resolution of the records will allow the detection of centennial-scale events and establish whether these are represented in both terrestrial and marine proxies. The most prominent abrupt climate events have usually been associated with glacial climates, and the canonical explanation of these events is that they are triggered by massive freshwater discharges into the North Atlantic. Evaluating and extending this paradigm to include climate instability during periods of excess warmth and reduced ice-volume is of particular significance, especially in the context of future climate change.

末次间冰期的特征是至少在过去25万年中最高的峰值温度和海平面，这是由北半球夏季日照增加以及海洋和陆地反馈造成的。虽然末次间冰期不是对未来全球预测的严格模拟，但它为“过度”变暖时期的气候不稳定提供了宝贵的观测背景。虽然许多海洋和陆地记录表明末次间冰期存在气候不稳定，但时间的不确定性使对报告事件的局部或区域意义的评估复杂化。该项目旨在制作一个“地层罗塞塔石碑”，将葡萄牙南部边缘相同的深海序列中的深水和地表水水文与区域植被变化的重建联系起来；连接海洋和陆地记录和追踪千年尺度变化的关键领域。记录分辨率的提高将使我们能够探测百年尺度的事件，并确定这些事件是否在陆地和海洋代用物中都有体现。最突出的气候突变事件通常与冰川气候有关，对这些事件的典型解释是，它们是由大量淡水排放到北大西洋引发的。评估和扩展这一范式，使其包括过热和冰量减少期间的气候不稳定性，尤其具有重要意义，特别是在未来气候变化的背景下。

项目成果

Enhanced climate instability in the North Atlantic and southern Europe during the Last Interglacial.

• DOI: 10.1038/s41467-018-06683-3
• 发表时间: 2018-10-12
• 期刊: Nature communications
• 影响因子: 16.6
• 作者: Tzedakis PC;Drysdale RN;Margari V;Skinner LC;Menviel L;Rhodes RH;Taschetto AS;Hodell DA;Crowhurst SJ;Hellstrom JC;Fallick AE;Grimalt JO;McManus JF;Martrat B;Mokeddem Z;Parrenin F;Regattieri E;Roe K;Zanchetta G
• 通讯作者: Zanchetta G