A New Collaborative Ice Sheet Modelling Program

摘要OPP-0082453卡夫这是一项与加州大学伯克利分校和卡尔加里大学的首席研究人员合作的提案。格陵兰冰盖是古气候信息的丰富储存库，可能会导致全球海平面的大幅上升。首席研究人员将开发一个模型，以提高对格陵兰冰盖动态和历史的理解；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)对累积速率的控制(通过更准确的历史重建)，2)通过冰流的作用进行流动动力学，以及3)对气候强迫的响应(通过调查对温度和降雨率的空间可变强迫的响应)。他们将利用P.Huybrechts博士的真实地理区域开发一个全三维的数值冰盖热力学模型。具体目标包括：1)改进格陵兰冰盖项目2(GISP2)冰芯的累积速率历史，并为这一记录建立不确定性。没有人试图从格陵兰冰芯重建与整个冰盖部分动力学一致的堆积速率历史2)来改进从冰芯推算堆积速率的一般方法。这将是首次尝试将累积率重建与整个冰盖模型的动态预测联系起来。3)通过考虑冰流中的快速流动，提高对格陵兰冰盖动力学的理解。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，但这个系统影响了冰盖的一大片区域，并可能使冰盖对气候变化的反应比通常计算的更快。4)通过对空间变化的强迫的反应，提高对格陵兰冰盖对气候变化的反应的了解。模式冰盖的百年气候强迫将来自NCAR气候系统模式，这是一个海洋-大气-海冰-陆地表面耦合模式。

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.