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.

提供的资金用于采用一种新技术，通过使用含有水同位素的完全耦合的大气-海洋环流模式和冰盖质量平衡的能量质量平衡模式的成对模拟来解决冰盖解体问题。研究人员将把他们的新技术应用于离散的千年时间切片到最后一次冰川消退（21,000到10,000年前），当时北方的大冰盖消失了。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），这些在古气候记录中有替代物。GCM的结果将迫使EMBM模拟冰盖质量平衡在每个时间片，并将测试的技能，通过比较其预测的冰盖质量损失的冰缘变化的地质记录推断在冰川消退。总的研究目标是确定最小量的融水可用于促进冰盖衰变所涉及的小规模过程。 更广泛的影响包括提供更深入了解冰盖衰变机制的承诺，以及参与研究的研究生和本科生的支持。