How did permafrost thaw affect regional climate and environment in continental Siberia?

多年冻土融化如何影响西伯利亚大陆的区域气候和环境？

• 批准号: 2597831
• 金额: --
• 依托单位: Northumbria University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2597831
• 关键词: How; did; permafrost; thaw; affect

Current studies concerning Siberian permafrost have aimed to reconstruct the history of permafrost growth in past climates, investigate permafrost decline in association with Antarctic sea ice, and examine the relationship of permafrost to carbon cycle dynamics (Vaks et al. 2013; Vaks et al 2020; Lechleitner et al. 2020). Prior studies have concentrated on niche timescales, typically the past 500,000 years to assess the relationship between global temperature and permafrost extent (Vaks et al. 2013; Pacton et al. 2013), although some studies are on relatively recent timescales (i.e. Vaks et al. 2020). The research aims of this study would primarily pick up from the limitations acknowledged by Lechleitner et al (2020) concerning the capability of speleothem records to identify the chemical signatures of permafrost degradation, the timescale that this occurs on, as well as the capability to reconstruct past climate and the identification of chemical signals governing these processes (Leichleitner et al. 2018). However, this study would essentially develop on existing literature by distinctly focusing on interglacial permafrost thawing paleoclimatic records from ~420,000 years ago to identify past climate dynamics associated feedbacks and the spatio-temporal behaviour of permafrost under different climate conditions (i.e. temperature). Therefore, to address the working question, this study would attempt to answer the following research questions (RQ): 1) Can the location and speed of permafrost thaw in Central Siberia be reconstructed under different warming scenarios? 2) What are the repercussions for moisture transport and Siberian ecosystems? 3) Can speleothems from Botovskaya cave accurately reconstruct past temperature changes?4) What is the relationship of speleothem proxies to local and global climate conditions?

目前关于西伯利亚永久冻土的研究旨在重建过去气候中的永久冻土生长历史，调查与南极海冰有关的永久冻土的减少，并研究永久冻土与碳循环动力学的关系(Vaks等人。2013年；Vaks等人2020年；Lechleitner等人。2020)。以前的研究集中在生态位时间尺度上，通常是过去500,000年来，以评估全球温度和永久冻土范围之间的关系(Vaks等人。2013年；Pacton等人。2013年)，尽管一些研究是关于相对较新的时间尺度(即Vaks等人)。2020)。这项研究的研究目的主要是从Lechleitner等人(2020)承认的关于洞穴记录识别永久冻土退化的化学特征、发生这种情况的时间尺度以及重建过去气候和识别支配这些过程的化学信号的能力方面的限制(Leichleitner等人)。2018年)。然而，这项研究基本上是在现有文献的基础上发展起来的，将重点明确地放在42万年前的间冰期多年冻土融化的古气候记录上，以确定过去与气候动力学相关的反馈以及不同气候条件(即温度)下永久冻土的时空行为。因此，为了解决工作中的问题，本研究试图回答以下研究问题(RQ)：1)在不同的变暖情景下，西伯利亚中部冻土融化的位置和速度能否被重建？2)对水汽输送和西伯利亚生态系统有什么影响？3)来自博托夫斯卡亚洞穴的洞穴能否准确地重建过去的温度变化？4)洞穴中的洞穴生态系统与当地和全球气候条件有什么关系？