Collaborative Research: A New Method for Understanding Mechanisms of Ice Sheet Demise Using Married General Circulation and Energy-Moisture Balance Model Simulations

合作研究：一种利用大气环流和能量-水分平衡模型模拟来了解冰盖消亡机制的新方法

• 批准号: 0753660
• 负责人: Anders Carlson
• 金额: $ 21.34万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-15 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0753660&HistoricalAwards=false
• 关键词: Collaborative; Research; New; Method; Understanding

Funding is provided to employ a new technique to address ice sheet disintegration through the use of paired simulations of a fully coupled atmosphere-ocean general circulation model (GCM) containing water isotopes and an energy mass balance model (EMBM) of ice sheet mass balance. The researchers will apply their new technique at discrete millennial time slices to the last deglaciation (21,000 to 10,000 years ago), when large Northern Hemisphere ice sheets disappeared. To test the skill of GCM results, the researchers will use tracers built into the model (i.e., water isotopes, cosmogenic isotopes, dust, sea salt, and wetland methane emissions) for which there are proxies in the paleoclimate record. GCM results will force the EMBM to simulate ice sheet mass balance at each time slice and will test the skill of the EMBM by comparing its predictions of ice sheet mass loss to that inferred from the geologic record of ice margin change during deglaciation. The overall research goal is to determine the minimum amount of melt water available to contribute to the small-scale processes involved in ice sheet decay. The broader impacts include the promise of providing greater insight into the mechanisms of ice sheet decay and the support of graduate and undergraduate students involved in the research.

提供资金，通过使用包含水同位素的完全耦合大气-海洋环流模型（GCM）和冰盖质量平衡的能量质量平衡模型（EMBM）的配对模拟，采用新技术来解决冰盖崩解问题。研究人员将在离散的千年时间切片上应用他们的新技术，直到最后一次冰消期（21,000 至 10,000 年前），当时北半球的大冰盖消失了。为了测试 GCM 结果的技巧，研究人员将使用模型中内置的示踪剂（即水同位素、宇宙成因同位素、灰尘、海盐和湿地甲烷排放），这些示踪剂在古气候记录中有代理。 GCM 结果将迫使 EMBM 模拟每个时间切片的冰盖质量平衡，并将通过将其对冰盖质量损失的预测与从冰消期期间冰缘变化的地质记录推断的结果进行比较来测试 EMBM 的技能。总体研究目标是确定可用于参与冰盖腐烂的小规模过程的最小融水量。 更广泛的影响包括有望提供对冰盖腐烂机制的更深入了解以及参与研究的研究生和本科生的支持。