Abrupt climate and sea level change

气候和海平面突变

• 批准号: 2607858
• 金额: --
• 依托单位: University of Leeds
• 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-2607858
• 关键词: Abrupt; climate; sea; level; change

This PhD project will use numerical modelling to examine the causes and consequences of rapid climate and sea level change. Case studies from past deglaciations will be utilised to reach a new level of understanding for the link between ice sheet melting and sea level rise, rapid cooling, abrupt warming and the complete reorganisation of Atlantic Ocean circulation.At the Last Glacial Maximum (21,000 years ago), vast ice sheets stretched across much of the Northern Hemisphere. As climate warmed and the ice began melting, an intriguing and catastrophic chain of events was triggered: Largescale ocean circulation slowed, climate cooled, armadas of icebergs were released, sea level rose at an unprecedented rate, ocean circulation rapidly strengthened, temperatures suddenly increased by several degrees in a few decades...and then it all happened again just a few centuries later. Although well documented individually, we still do not know precisely how and even if these events are linked. Perhaps even more intriguingly, we know that many of the events have occurred repeatedly in Earth's past, suggesting there are consistent but currently unknown mechanisms in the Earth System for triggering abrupt climate change.The scientific community remains divided on the cause of the events, but there is consensus that the mechanisms are important to understand in order to predict when they will occur. As atmospheric CO2 rises in the coming years, and the Greenland and Antarctic ice sheets continue to melt, could these catastrophic events be triggered again?This exciting project will tackle this challenge directly, testing ice-ocean-atmosphere interactions that take place during deglaciations in order to produce seminal new knowledge on our climate. You will be at the heart of two international projects producing new model simulations and observational records of past abrupt climate change: The Paleoclimate Model Intercomparison Project (PMIP) Deglaciations Working Group and The International Union for Quaternary Research Focus Group on Deglaciations, both coordinated by Dr. Ruza Ivanovic. Thus, you will be granted access to the latest results and thinking from world-leading scientists, and, positioned at the forefront of international research into past warming climates, you will have the opportunity to feed into the global research agenda.PROJECT AIMYou will run and analyse complex numerical earth system models to examine the interplay between climate, ice sheets, icebergs and ocean circulation. You will compare the results from these simulations to observational records to evaluate model performance, verify/refute existing explanations for the events, and build and test new hypotheses. The overall aim is to establish the mechanisms that link ice, atmosphere and ocean in the Earth System, then explore the possibility that such rapid and catastrophic events as we know have occurred in the past will occur again in the future.

该博士学位项目将使用数值建模来检查快速气候和海平面变化的原因和后果。将利用过去脱脂的案例研究，以对冰盖融化与海平面上升，快速冷却，突然的变暖以及大西洋海洋循环的完全重组之间的联系达到新的理解，这是最后一个冰川最大值（21，000年前），大量的冰片遍布北部半北部的大部分。随着气候变暖和冰开始融化，触发了一系列有趣的灾难性事件链：Largescale Ocean Crockulation减慢，气候冷却，释放了气候降温，海平面以前所未有的速度上升，海洋循环迅速增强，温度突然增加了几个学位，然后在几个世纪中又发生了几个，几个又几乎没有一个少数几个。尽管单独记录了良好的文献记载，但我们仍然不确定如何以及链接这些事件。也许更有趣的是，我们知道许多事件在地球的过去反复发生，这表明目前在地球系统中存在一致但未知的机制来触发突然的气候变化。科学界在事件的原因上仍然分歧，但有共识，确定的机制是为了预测何时会发生的机制。随着大气二氧化碳在未来几年的上升，格陵兰和南极冰盖继续融化，可以再次触发这些灾难性的事件吗？这个令人兴奋的项目将直接应对这一挑战，测试冰山 - 大气相互作用，这些相互作用在脱胶过程中发生，以便在我们气候上产生开创性的新知识。您将是两个国际项目的核心，这些国际项目产生了新的模型模拟和过去的突然气候变化的观察记录：古气候模型对比项目（PMIP）脱胶工作组和国际Quaternary Research for for deglaciations of Declaciations，均由Ruza Ivanovic博士协调。因此，您将获得最新结果并从世界领先的科学家那里进行思考，并位于国际对过去变暖气候的研究的最前沿，您将有机会进入全球研究议程。ProjectAimyou将运行并分析复杂的数值接地系统模型，以检查气候，冰，冰，冰，冰，冰，冰，冰，冰，冰，冰，冰，冰，冰，冰，冰，海洋循环和海洋循环。您将将这些模拟的结果与观察记录进行比较，以评估模型性能，验证/反驳事件的现有解释，并构建和检验新的假设。总体目的是建立将冰，大气和海洋连接到地球系统中的机制，然后探索我们过去知道的这种快速和灾难性事件的可能性，将来会在将来再次发生。