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?

目前有关西伯利亚多年冻土的研究旨在重建过去气候中多年冻土生长的历史，研究与南极海冰的长期冻土下降，并研究了永久冻土与碳循环动力学的关系（Vaks等人，2013年； Vaks等人2020; Lechleitner等人2020; 2020; 2020）。先前的研究集中在利基时间尺度上，通常是过去500，000年来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，2013），尽管一些研究是关于相对较新的时间表（即Vaks等人2020）。这项研究的研究目的主要是从Lechleitner等人（2020年）所承认的有关Speleothem记录的能力确定永久冻土降解的化学特征的能力的局限性，该记录的化学特征，这是发生在过去的气候和列出这些过程的列表的能力以及对这些过程的确定性（同时）（lieChipers）的能力。但是，这项研究将通过明显的重点在420，000年前融化冰冻的古气候记录，从而确定过去的气候动力学相关的反馈以及在不同的气候条件下（即温度）（即，即多年的时空行为）（即，从420，000年开始）。因此，为了解决工作问题，这项研究将试图回答以下研究问题（RQ）：1）在西伯利亚中部，长期冻结的位置和速度是否可以在不同的温暖场景下重建？ 2）水分传输和西伯利亚生态系统的影响是什么？ 3）来自Botovskaya洞穴的Speleothems可以准确地重建过去的温度变化吗？4）Speleothem代理与局部和全球气候条件的关系是什么？