NASA's Operation IceBridge mission flew over the Ross Sea, Antarctica (20 and 27 November 2013) and collected data with Airborne Topographic Mapper (ATM) and Digital Mapping System (DMS). Using the DMS and reflectivity of ATM L1B, leads are detected to define local sea level height. The total freeboard is then obtained and converted to ice thickness. The estimated mean sea-ice thickness values are found to be in the 0.48–0.99 m range. Along the N-S track, sea ice was thinner southward rather than northward of the fluxgate, resulting in two peaks of modal thickness: 0.35 m (south) and 0.7 m (north). This supports that new ice produced in coastal polynyas is transported northward by katabatic winds off the ice-shelf. The lowest (2%) elevation method used for freeboard retrieval for ICESat is also tested for ATM data. It is found that the lowest elevation method tends to overestimate freeboard, but mean values are less affected than mode values. Using mean thickness values of ICESat and ATM along the ‘fluxgate’, separating the shelf from the deep ocean, the exported ice volume at this ‘fluxgate’ is found to be higher during the ICESat years (2003–2008) than during the IceBridge year (2013).

中文翻译：

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来自空中（IceBridge 2013）和卫星（ICESat 2003-2008）观测的罗斯海海冰干舷和厚度

NASA 的“冰桥行动”任务飞越南极洲罗斯海（2013 年 11 月 20 日至 27 日），并使用机载地形测绘仪 (ATM) 和数字测绘系统 (DMS) 收集数据。使用 DMS 和 ATM L1B 的反射率，检测引线以确定当地海平面高度。然后获得总干舷并将其转换为冰厚度。估计的平均海冰厚度值在 0.48-0.99 m 范围内。沿着 NS 轨道，海冰向南变薄而不是向北变薄，导致模态厚度的两个峰值：0.35 m（南）和 0.7 m（北）。这支持了沿海冰间产生的新冰被冰架下的下风向北输送。用于 ICESat 干舷检索的最低 (2%) 高程方法也针对 ATM 数据进行了测试。发现最低标高法往往会高估干舷，但平均值的影响小于众数值。使用 ICESat 和 ATM 沿“磁通门”的平均厚度值，将大陆架与深海分开，在这个“磁通门”处输出的冰量在 ICESat 年（2003-2008 年）高于冰桥年（2013）。