Collaborative Research: Time-Continuous Climate Simulations of Abrupt Events and Transitions through the Cenozoic

合作研究：新生代突发事件和转变的时间连续气候模拟

• 批准号: 0513402
• 负责人: Robert DeConto
• 金额: $ 48.96万
• 依托单位: University of Massachusetts Amherst
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-03-01 至 2012-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0513402&HistoricalAwards=false
• 关键词: Collaborative; Research; Time; Continuous; Climate

This award funds the development of a new class of climate system models combining the spatial capabilities of coupled General Circulation Models (GCM) with highly resolved and computationally efficient long-term components including ice sheets and oceans. This will allow for long temporal integrations while accounting for evolving boundary conditions and transient forcing, including greenhouse gas variations. The premise for the project is that the application of sophisticated numerical climate models to isolated snapshots at specific time points through the Cenozoic has contributed to an understanding of equilibrium climate sensitivity under a wide range of boundary conditions. The researchers maintain that such an approach is somewhat limited by failing to account for the time-continuous nature of climate change over long time scales. They postulate that a better understanding of relatively sudden transitions and abrupt events recognized in Cenozoic climate records requires a new modeling approach capable of multi-million year integrations of long-term variables (i.e., oceans, ice sheets, geochemical cycles) while accounting for relatively high frequency forcing (e.g., orbital cycles) and internal feedbacks contributing to non-linear behavior.Specifically, the researchers will simulate both transitional climate shifts (Eocene-Oligocene cooling and Antarctic glaciation; Middle-Late Miocene cooling and the buildup of East Antarctic ice; onset of Northern Hemisphere glaciation) and transient events (earliest Miocene glaciation) recognized in proxy climate records. The researchers will use multiple simulations in an attempt to identify the primary forcing and important processes associated with: 1) physical climate components, feedbacks, and interactions; and 2) the role of orbital, greenhouse gas, and tectonic forcing in Cenozoic climate variability. Results from this research have the potential to add to the knowledge of how Earths climate transitions from one mean state to another by examining key Cenozoic temporal horizons. The use of a Global Imagination projector enhances the research and education aspects of the project by adding the ability to display model results on a spherical projection that is layered in any manner that the researcher chooses. Superimposing climatic circulation patterns over landmasses on a rotating globe, for example, can help researchers gain a new perspective on their model results while encouraging new avenues of inquiry. Similarly, allowing those outside of the field of modeling and members of the general public to see such representations could lead to greater understanding of climate processes by spurring new thoughts on old subjects.

该奖项为新的气候系统模型的发展提供了资金，该模型结合了耦合通用循环模型（GCM）的空间能力以及高度分辨和计算高效的长期组件，包括冰盖和海洋。这将允许长时间的时间整合，同时考虑不断发展的边界条件和瞬态强迫，包括温室气体变化。 该项目的前提是，通过新生代在特定时间点应用复杂的数值气候模型在特定时间点隔离快照，这有助于理解在广泛的边界条件下平衡气候灵敏度。研究人员坚持认为，这种方法在某种程度上没有说明长期尺度上气候变化的及时性质而受到限制。他们假设，在库诺卡气候记录中认识到相对突然的过渡和突然事件的更好理解需要一种新的建模方法，能够在长期变量（即海洋，冰盖，地球化学周期）中进行数百万年度整合，同时考虑相对较高高频强迫（例如，轨道循环）和内部反馈有助于非线性行为。具体地说，研究人员将模拟两种过渡性气候变化（始新世 - 寡新世冷却和南极冰川;中元元素中新世冷却以及东南极冰的堆积在北半球的冰川中发作和瞬时事件（最早的中新世冰川）在代理气候记录中认可。研究人员将使用多个模拟来确定与：1）物理气候组成部分，反馈和相互作用的主要强迫和重要过程； 2）轨道，温室气体和构造强迫在新生代气候变化中的作用。这项研究的结果有可能通过检查关键的新生代时间范围来增加对地球气候如何从一种平均状态到另一种状态的知识。全球想象力投影仪的使用通过添加了以研究人员选择的任何方式层层的球形投影显示模型结果的能力，从而增强了项目的研究和教育方面。例如，在旋转地球仪上的陆地上的叠加气候循环模式可以帮助研究人员对其模型结果获得新的看法，同时鼓励新的询问途径。同样，允许建模领域和公众成员看到这种表示形式的人，可以通过刺激对旧主题的新思想来进一步了解气候过程。