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

鉴于人为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了解过度变暖时期的自然背景条件提供了宝贵的见解。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℃，北极剧烈变暖，全球海平面比现在高6-9米。尽管之前被认为是相对稳定的，但最近的研究表明，在北大西洋和南欧，一系列高频气候振荡的强度大于全新世（过去11.7万年），打断了末次间冰期（Tzedakis et al., 2018）。这引发了一系列关于突发事件的地理范围和强度的问题，以及比现在更暖的间隔是否本质上更不稳定的气候。缺乏精确、独立和可靠的年代学控制是限制在早期间冰期内确定高频气候变率的主要制约因素。本项目采用年代测定的火山灰（火山灰）层年代学，旨在利用花粉分析来重建陆地植被，并评估意大利中部富西诺盆地末次间冰期与全新世相比的气候不稳定程度。

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.