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

鉴于人类活动引起的变暖具有前所未有的性质，对过去间冰期的定量古气候重建为过度温暖时期的自然背景条件提供了有价值的见解。一个突出的例子是末次间冰期（12.9 - 11.6万年前），其特征是全球平均温度比工业化前高1摄氏度，北极变暖剧烈，全球海平面比现在高6-9米。尽管以前被认为是相对稳定的，最近的研究揭示了一系列高频率的气候振荡，其强度超过了全新世（过去11700年）在北大西洋和南欧的最后一次间冰期（Tzedakis等人，2018年）。这就提出了一系列关于突发事件的地理范围和强度的问题，以及是否比现在更温暖的时间间隔本身就更不稳定。缺乏精确、独立和可靠的年代学控制一直是限制早期间冰期高频气候变率识别的主要制约因素。应用年代学，使用过时的火山灰（火山灰）层，该项目的目的是采用花粉分析，以重建陆地植被和评估的气候不稳定的程度，在末次间冰期在Fucino盆地，意大利中部，与全新世相比。

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.