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Character of climate instability during warm periods: Investigations from Central Italy

温暖时期气候不稳定的特征：意大利中部的调查

基本信息

批准号：
2061784
负责人：
金额：
--
依托单位：
University College London
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2018
资助国家：
英国
起止时间：
2018 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2061784
关键词：
Character climate instability during warm

项目摘要

In light of the unprecedented nature of anthropogenically-induced warming, quantitativepalaeoclimate reconstructions of past interglacials offer a valuable insight into naturalbackground conditions during periods of excess warmth. A prominent example is the LastInterglacial (129-116 thousand years ago), characterised by global mean temperature 1deg Cabove pre-industrial values, intense Arctic warming and global sea-level ~6-9 m abovepresent.Despite being previously considered as relatively stable, recent research has revealed aseries of high-frequency climate oscillations of greater intensity than during the Holocene (last11.7 thousand years) punctuating the Last Interglacial in the North Atlantic and southernEurope (Tzedakis et al., 2018). This has raised a series of questions regarding thegeographical extent and intensity of abrupt events, as well as whether intervals warmer thanpresent are inherently more climatically unstable.A lack of precise, independent and robust chronological control has been the primaryconstraint limiting the identification of high-frequency climate variability within earlierinterglacials. Applying a chronology using dated volcanic ash (tephra) layers, this project aimsto employ pollen analysis to reconstruct terrestrial vegetation and assess the extent of climateinstability during the Last Interglacial at Fucino Basin, Central Italy, compared to the Holocene.

鉴于人类活动导致的气候变暖是史无前例的，过去间冰期的定量古气候重建提供了对过度温暖时期的自然背景条件的宝贵洞察。一个突出的例子是末次间冰期(129-11.6万年前)，其特征是全球平均气温比工业化前高出1摄氏度，北极剧烈变暖，全球海平面高出约6-9米。尽管以前被认为是相对稳定的，但最近的研究发现，在北大西洋和南欧的最后一次间冰期(Tzedakis等人，2018年)期间，一系列高频气候振荡的强度比全新世(过去11.7万年)更大。这引发了一系列问题，涉及突发事件的地理范围和强度，以及比现在更温暖的间隔是否天生就更不稳定。缺乏精确、独立和强大的年代学控制一直是限制识别早期间冰期高频气候变异性的主要制约因素。应用年代火山灰(Tephra)层年表，该项目旨在利用花粉分析来重建陆地植被，并评估意大利中部富契诺盆地最后一次间冰期与全新世相比气候不稳定的程度。