A New Collaborative Ice Sheet Modelling Program

一个新的协作冰盖建模程序

• 批准号: 0082453
• 负责人: Kurt Cuffey
• 金额: $ 18.78万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-10-01 至 2005-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0082453&HistoricalAwards=false
• 关键词: New; Collaborative; Ice; Sheet; Modelling

AbstractOPP-0082453CuffeyThis is a collaborative proposal with Principal Investigators from the Universities of California-Berkeley and Calgary. The Greenland ice sheet is a rich repository for paleoclimate information and may contribute to substantial increases in global sea level. The Principal Investigators will develop a model to improve understanding of Greenland ice sheet dynamics and history; this will complement existing modeling programs at European universities and institutes. The work will improve understanding of: 1) controls on accumulation rate (through more accurate historical reconstructions), 2) flow dynamics through the role of ice stream flow, and 3) response to climate forcings (by investigating response to spatially variable forcings of temperature and precipitation rate).They will develop a numerical fully three-dimensional thermomechanical model of the ice sheet using a realistic geographic domain by Dr. P. Huybrechts. The specific objectives include:1) To improve the accumulation rate history derived from the Greenland Ice Sheet Project 2 (GISP 2) ice core and establish uncertainties for this record. No attempt has been made to reconstruct accumulation rate history from the Greenland ice cores that is consistent with the partial dynamics of the whole ice sheet2) To improve the general methodology for derivation of accumulation rate from ice cores. This will be the first attempt to link accumulation rate reconstructions to the dynamic predictions of a whole ice sheet model. 3) To improve understanding of Greenland ice sheet dynamics by accounting for fast flow in ice streams. The enormous ice flux through the Jakobshavn ice stream has not been resolved in whole ice sheet models, but this system affects a large region of the ice sheet and probably allows the ice sheet to respond more rapidly to climate change than is usually calculated. 4) To improve understanding of the response of the Greenland ice sheet to climate change by the response to spatially varying forcings. Century-scale climatic forcing for the model ice sheet will be derived from the NCAR Climate System Model, a coupled ocean-atmosphere-sea ice-land surface model.

这是一项与加州大学伯克利分校和卡尔加里大学首席研究员的合作提案。格陵兰冰盖是一个丰富的古气候信息储存库，可能导致全球海平面大幅上升。首席调查员将开发一个模型，以提高对格陵兰冰盖动态和历史的了解；这将补充欧洲大学和研究所现有的建模项目。这项工作将提高对以下方面的理解：1)对积累速率的控制（通过更精确的历史重建），2)通过冰流流动的作用的流动动力学，以及3)对气候强迫的响应（通过研究对温度和降水率空间可变强迫的响应）。他们将利用P. Huybrechts博士提出的现实地理区域，建立一个全三维冰盖热力学数值模型。具体目标包括：1)改进格陵兰冰盖计划2 （GISP 2）冰芯的积累速率历史，并确定该记录的不确定性。没有人试图从格陵兰冰芯中重建与整个冰盖部分动力学相一致的积累速率历史2)改进从冰芯中推导积累速率的一般方法。这将是将累积率重建与整个冰盖模型的动态预测联系起来的第一次尝试。3)通过考虑冰流的快速流动，提高对格陵兰冰盖动力学的认识。通过雅各布港冰流的巨大冰通量尚未在整个冰盖模型中得到解决，但该系统影响了冰盖的大片区域，并且可能使冰盖对气候变化的反应比通常计算的更快。4)通过对空间变化强迫的响应，提高对格陵兰冰盖对气候变化响应的认识。模式冰盖的世纪尺度气候强迫将来自NCAR气候系统模式，这是一个耦合的海洋-大气-海洋-冰-陆表面模式。