Investigation of Interannual Sea Ice Thickness Variability in the Southern Ocean

0130537 Ackley拟议的工作将根据1980年以来的观测结果，建立一个系统的原位南极海冰厚度气候学。 海冰厚度是迄今为止最不为人所知的属性-可以从卫星上观测到诸如面积范围和紧密度等水平属性-但厚度信息对于约束大尺度气候模型是必要的。 南极海冰的三维增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。需要监测变化和变化的四个主要大尺度海冰特性是冰的厚度、密实度（包括范围）、运动和变形。在大尺度气候模型中，由于缺乏海冰厚度数据进行验证，因此出现了一个“自由“参数，可任意调整，并产生了各种无法检查的结果。 因此，很难确定哪个模型物理是正确的，导致对各种参数的敏感性的不同观点。该项目将（1）提供一个海冰厚度的原位气候学（其次是紧密度），使用最近从1980年至2000年的42个航次中恢复的11，000份海冰属性记录;（2）通过验证研究，扩大原位海冰气候学，包括1995年至2000年美国国家冰中心冰图的遥感信息，以及（3）通过确定南极海冰气候学、气候变率和气候趋势之间的关系，有助于更好地了解空气-冰-海洋相互作用。这项工作将通过将海冰气候学结果连接到公共NIC网站以验证数值模式输出，为数据同化、研究海冰过程和业务使用获得误差有界的输入。

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.***