Ocean Tide Modeling in South Ross Sea Using Interferometric SAR and Radar Altimetry

这项拟议的工作是试图使用ERS-1和ERS-2的雷达高度计数据和合成孔径雷达数据以干涉模式建立罗斯冰架下的正压海洋潮汐模型。一个30公里分辨率的模型将应用于整个罗斯冰架，而一个更高分辨率(30米)的模型将被开发用于100平方公里的陆架边缘部分。这项工作的一个预期结果是改善了罗斯冰架南部接地线的位置。海洋潮汐在大气、海洋、海冰和漂浮的冰架之间的复杂相互作用中发挥着重要作用。潮流在冰架底部造成湍流混合，造成部分冰山可能分离的裂缝，并可能影响冰架和海水之间的热量传输。拟议调查的主要科学目标包括：(1)开发减少潮汐混叠限制的方法，并使用重复通过合成孔径雷达干涉测量(InSAR)和来自ERS-1和ERS-2的雷达高度计数据来确定南罗斯海地区的精细分辨率(30-50米)正压海潮模型，(2)覆盖罗斯冰架浮动冰架区域的更高分辨率(30公里)的正压海潮模型，(3)评估和量化与所产生的潮汐模型有关的误差，以及(4)提供了一个改进的确定南罗斯海冰层和冰架之间的接地线的实例。该方法将利用南罗斯海上空ERS地面轨迹的汇聚和合成孔径雷达条带的重叠，试图打破潮汐混叠。所得到的模型将验证其准确性，并将其应用于其在检测南罗斯海冰架接地线方面的潜在改进的测试案例。

0088029Shum The proposed work is an attempt to use radar altimeter data and synthetic aperture radar data in an interferometric mode from ERS-1 and ERS-2 to develop a barotropic model of the ocean tide under the Ross Ice Shelf. A 30-kilometer resolution model will be applied to the entire Ross Ice Shelf, while a higher resolution (30 meters) model will be developed for a 100 square kilometer section of the shelf edge. One expected result of this work is an improved location of the southern grounding line of the Ross Ice Shelf. Ocean tides play a significant role in the complex interactions between the atmosphere, ocean, sea ice and floating glacial ice shelves. Tidal currents creates turbulent mixing at the bottom of the ice shelf contributing to the creation of rifts for the possible detachment of part of the icebergs and can influence heat transport between the ice shelf and sea water. The primary scientific objectives of the proposed investigation include: (1) the development of methodologies to diminish the tidal aliasing limitations and to use repeat-pass synthetic aperture radar interferometry (InSAR) and radar altimeter data from ERS-1 and ERS-2 for the determination of a fine resolution (30-50 m) barotropic ocean tide model in the South Ross Sea region, (2) a coarser resolution (30 km) barotropic ocean tide model covering the floating ice shelf region of the Ross Ice Shelf, (3) the assessment and quantification of errors associated with the resulting tide model, and (4) provide a demonstration of improved determination of grounding line between grounded ice and ice shelf in the South Ross Sea. The approach will make use of the convergence of ERS ground tracks over the southern Ross Sea and the overlapping of SAR swaths to attempt to break the tidal aliasing. The resulting model will be validated for its accuracy and applied to a test case of its potential improvement in the detection of grounding lines in the South Ross Sea Ice Shelf.***