Understanding Climate-Biogeochemical Feedbacks During the Last Glacial Cycle: A Systematic Modeling and Paleo-Data Synthesis Approach

研究人员及其同事将使用系统的建模方法来解开千年和冰川间冰期气候变化的控制强迫功能以及放大机制。这项研究的总体科学目标是更好地了解从末次冰期到全新世过渡期间物理和地球化学过程的动态作用。研究人员将使用全球三维动态大气-海洋-与植被模式和海洋碳循环模式耦合的中等复杂性海冰模式，以开发涵盖末次冰期终止和整个全新世时期。该模型的模拟输出将直接比较，在振幅，时间和季节性方面，与公开可用的海洋，以及陆地，代理档案涉及数据从沉积物芯，冰芯，洞穴沉积物，和湖泊水平indexs.The研究战略的目的是追求以下科学问题：如何全球碳循环响应轨道驱动的气候变化？轨道引起的南半球西风带变化在驱动大气二氧化碳变化中有多重要？碳循环响应在加速冰川-间冰期转变中发挥了什么作用？在末次冰期，碳循环在调节千年尺度的气候变率方面发挥了什么作用？这项研究将有助于提高更广泛的科学界对地球辐射敏感性的理解，并可能对未来气候的理解产生影响。研究战略将具体帮助区分，区域，各种气候强迫因素和援助进一步努力解释从末次冰期的古代用数据。该研究项目还将培训一名博士后学者和一名古气候建模和数据分析研究生。

The researcher, and colleagues, will use a systematic modeling approach to disentangle the controlling forcing functions, as well as amplifying mechanisms, of millennial and glacial-interglacial climate variability. The general scientific goal of the research is an improved understanding of the dynamic role of physical and biogeochemical processes during the transition from the last glacial into the Holocene.Specifically, the researcher will use a global three-dimensional dynamical atmosphere-ocean-sea ice model of intermediate complexity coupled to a vegetation model and a marine carbon cycle model to develop transient simulations covering the last glacial termination and the entire Holocene period. The model simulation output will be directly compared, in terms of amplitude, timing and seasonality, with publicly available marine, as well as terrestrial, proxy archives involving data from sediment cores, ice cores, speleothems, and lake-level indices.The research strategy is designed to pursue the following scientific questions:How does the global carbon cycle respond to orbitally-driven climate variations? How important are orbitally-induced changes of the southern hemispheric westerlies in driving atmospheric carbon dioxide variations? What role does the carbon cycle response play in accelerating glacial-interglacial transitions?What role does the carbon cycle play in modulating millennial-scale climate variability during the last glacial period? The research will help to improve the wider science community''s understanding of the radiative sensitivity of Earth with possible implications for the understanding of future climate. The research strategy will specifically help differentiate, regionally, between various climate forcing factors and aid further efforts to interpret paleo-proxy data from the last glacial period. The research project will also enable the training of a postdoctoral scholar and a graduate student in paleoclimate modeling and data analyses.