Pliocene Arctic vegetation and its feedbacks with climate: combining Lake El´gygytgyn pollen data and vegetation modelling

这些调查将有助于ICDP资助的西伯利亚东北部的“El'gygytgyn钻探项目”。它们主要包括中央湖El 'gygytgyn D1岩芯上新世和早更新世部分的孢粉学分析，从而补充了俄罗斯和美国的合作孢粉学家在中更新世和晚更新世岩芯部分的相应调查。温暖的上新世时期被认为是未来全球变化的一个密切类似。我们的目标是：（A）利用基于化石花粉数据的逆植被模型量化过去的气候变化，以得出未来北极可能进一步变暖的结论;（B）利用基于花粉的景观模型量化树木类群覆盖率，我们将根据植被-气候反馈机制进行解释;（C）推断过去的花粉库存和多样性及其随气候周期性的变化，以了解现代北极植被的起源和来源。在我们的研究设计中，我们故意将现代和化石花粉研究以及基于代理的建模方法交织在一起。通过我们的项目，我们将从古气候学的角度来讨论有关当今和未来北极变暖及其与植被的反馈的有争议的问题。

The investigations proposed contribute to the ICDP funded „El'gygytgyn Drilling Project“ in northeastern Siberia. They mainly comprise palynological analysis of the Pliocene and Early Pleistocene part of core D1 from central Lake El´gygytgyn, thus complementing respective investigations in the Middle and Late Pleistocene core part by collaborating palynologists in Russia and the USA. The warm Pliocene epoch is considered to be a close analogue to future global change. We aim (A) to quantify past climate change using inverse vegetation modelling based on fossil pollen data to conclude about potential further warming of the future Arctic; (B) to quantify tree taxa coverages using pollen-based landscape modelling that we will interpret in terms of vegetation-climate feedback mechanisms; (C) to infer past pollen inventory and diversity and its changes with climate cyclicity to understand the origin and source of modern Arctic vegetation. We deliberately intertwined modern and fossil pollen studies as well as proxy-based and modelling approaches in our study design. With our project we will contribute a palaeoclimatic perspective to controversially discussed questions concerning present-day and future Arctic warming and its feedbacks with vegetation.