Investigation of Interannual Sea Ice Thickness Variability in the Southern Ocean

南大洋海冰厚度年际变化调查

• 批准号: 0130537
• 负责人: Stephen Ackley
• 金额: $ 4万
• 依托单位: Clarkson University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-15 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0130537&HistoricalAwards=false
• 关键词: Investigation; Interannual; Sea; Ice; Thickness

0130537AckleyThe proposed work will develop a systematic climatology of in situ antarctic sea ice thickness from observations made since 1980. Sea ice thickness is by far the least well known property - horizontal properties such as areal extent and compactness can be observed from satellites - but thickness information is necessary to constrain large-scale climate models. The three-dimensional growth and decay of antarctic sea ice is an important feature of the global climate system as it directly modifies ocean-atmosphere interaction in the Southern Ocean. The four major large-scale sea ice properties that need to be monitored for variability and change are ice thickness, compactness (including extent), movement, and deformation. In large-scale climate models, the lack of sea ice thickness data for validation introduces a "free"parameter for arbitrary tuning and allows a wide range of results which cannot be checked. Hence it is difficult to ascertain which model physics are correct, leading to divergent viewpoints about the sensitivity of the various parameters. This project will (1) provide an antarctic climatology of in situ sea ice thickness (and secondarily compactness) using the recently recovered 11,000 sea ice property records from 42 voyages between 1980 and 2000; (2) through validation studies, expand the in situ sea ice climatology to include remote sensinginformation from U.S. National Ice Center ice charts from 1995 to 2000, and (3) contribute to the greater knowledge of air-ice-ocean interaction by determining the relationship between an antarctic sea ice climatology, climate variability, and climate trends.The work will serve the community at large by linking the sea ice climatology results into the public NIC web-site for the validation of numerical model outputs, to obtain error-bounded input for dataassimilation, to study sea ice processes, and for operational use.***

0130537Ackley拟议的工作将开发出一种自1980年以来观察结果的原位南极海冰厚度的系统气候。到目前为止，海冰厚度是最不知名的特性 - 可以从卫星上观察到水平范围和水平范围，但可以从卫星上观察到 - 但是厚度信息是必要的，但是厚度信息是限制大型大型气候模型的必要条件。 南极海冰的三维生长和衰减是全球气候系统的重要特征，因为它直接改变了南大洋中的海洋 - 大气相互作用。需要监控可变性和变化的四个主要大型海冰性能是冰厚，紧凑度（包括范围），运动和变形。在大规模的气候模型中，缺乏验证的海冰厚度数据引入了一个“免费”参数以进行任意调整，并允许无法检查的广泛结果。 因此，很难确定哪种模型物理是正确的，从而导致有关各种参数灵敏度的不同观点。该项目（1）将使用最近在1980年至2000年之间的42次航行中回收的11,000次海冰物业记录提供现场海冰厚度的南极气候； （2）通过验证研究，扩大现场海冰气候学，包括从1995年到2000年美国国家冰中心冰图的遥感信息，以及（3）通过确定南极海冰的冰际趋势和气候趋势的广泛效果，从而有助于对空气冰山相互作用的更多知识。数值模型输出，以获取误差的输入以进行数据介绍，研究海冰工艺和运营使用。***