Collaborative Research: Detailed Investigation of the Dynamic Component of Sea Ice Mass Balance

合作研究：海冰质量平衡动力成分的详细研究

• 批准号: 0612527
• 负责人: Jennifer Hutchings
• 金额: --
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-15 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0612527&HistoricalAwards=false
• 关键词: Collaborative; Research; Detailed; Investigation; Dynamic

Hutchings - 0612527Geiger - 0611991Kambhamettu - 0612105A campaign consisting of fieldwork, remote sensing analyses, and modelling is proposed to investigate the mechanisms whereby the motion of sea ice, in particular the opening of leads and their closing to form ridges, contribute to the mass balance of the arctic ice pack. The field campaign is proposed to occur over a 2-month period in spring 2007, taking advantage of the planned U.S. Navy ice camp. The season and location of the camp occur when and where this dynamic component dominates the mass balance of an ice cover that is nearing its maximum annual mean thickness. Data collected will be used to directly validate model parameterizations of the relationship between stress and strain rate within the ice pack and the mechanical redistribution of ice mass. The PIs will test model configurations commonly used in Global Climate Models (GCMs), to provide the GCM community with a direct estimate of how accurately such models reproduce the ridging and dynamic-thermodynamic control of the ice thickness distribution. A series of model runs will be performed to estimate sea ice mass sensitivity to model parameters and variables. Combined analysis of this model output, observations and sensor inter-comparisons will allow identification of key monitoring requirements to complement model uncertainties. The results of this study will contribute to a better understanding of the processes contributing to variations in the arctic sea ice pack, enhancements to models of such processes, and consequent improved predictions of the trajectory of important aspects of the climate system, such as the recently observed reduction in summer sea ice extent in the Arctic Ocean.

Hutchings-0612527Geiger-0611991Kambhamettu-0612105A运动由野外工作、遥感分析和模拟组成，旨在研究海冰的运动，特别是引线的打开和闭合形成海脊，有助于北极冰盖的质量平衡的机制。野战活动计划在2007年春季进行，为期两个月，利用计划中的美国海军冰雪营地。夏令营的季节和地点发生在这种动态成分支配着接近其年平均最大厚度的冰盖的质量平衡时。收集的数据将被用来直接验证冰包内应力和应变率之间的关系以及冰块的机械重新分布的模型参数。PIS将测试全球气候模式(GCM)中常用的模式配置，为GCM社区提供关于此类模式再现冰层厚度分布的隆起和动力热力学控制的精确度的直接估计。将进行一系列模型运行，以估计海冰质量对模型参数和变量的敏感性。对该模型输出、观测和传感器相互比较的综合分析将有助于确定关键的监测要求，以补充模型的不确定性。这项研究的结果将有助于更好地了解造成北冰洋海冰变化的过程，改进这种过程的模型，从而改进对气候系统重要方面的轨迹的预测，例如最近观察到的北冰洋夏季海冰面积的减少。