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.***

[00:53 . 37]拟议的工作将根据1980年以来的观测资料，建立一个系统的南极海冰原位厚度气候学。海冰厚度是迄今为止最不为人所知的特性——可以从卫星上观测到面积范围和密实度等水平特性——但是厚度信息对于约束大尺度气候模型是必要的。南极海冰的三维生长和衰减是全球气候系统的一个重要特征，因为它直接改变了南大洋的海洋-大气相互作用。需要监测变率和变化的四种主要大尺度海冰特性是冰厚、密实度（包括范围）、移动和变形。在大尺度气候模式中，由于缺乏海冰厚度数据进行验证，引入了一个“自由”参数来进行任意调整，并允许范围广泛的结果无法进行检查。因此，很难确定哪个物理模型是正确的，从而导致对各种参数的敏感性产生不同的观点。该项目将(1)利用1980年至2000年期间42次航行中最近恢复的11,000个海冰属性记录，提供南极原位海冰厚度（和次级密实度）的气候学；(2)通过验证研究，扩大现场海冰气候学，使其包括1995年至2000年美国国家冰中心冰图的遥感信息；(3)通过确定南极海冰气候学、气候变率和气候趋势之间的关系，增加对气-冰-海洋相互作用的认识。这项工作将通过将海冰气候学结果连接到NIC的公共网站，以验证数值模式输出，获得数据同化的误差输入，研究海冰过程，并为业务使用服务。***