C‐band backscatter from a complexly‐layered snow cover on first‐year sea ice
C‐band backscatter from a complexly‐layered snow cover on first‐year sea ice
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第一年海冰上复杂层积雪的 C 波段后向散射
DOI：
10.1002/hyp.10255
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发表时间：
2014
影响因子：
3.2
通讯作者：
C. Derksen
中科院分区：
文献类型：
--
作者：
M. Fuller;T. Geldsetzer;J. P. Gill;J. Yackel;C. Derksen
我们提出了一个案例研究，对光滑、陆地固定、第一年海冰上复杂分层积雪的C波段微波反向散射特征进行了观察和建模。我们研究了复杂分层的雪如何影响后向散射，通过将签名与简单积雪的签名进行比较，并通过模型敏感性分析。后向散射特征是使用基于表面的散射仪在加拿大哈德逊湾的海冰上获得的。同时进行的冰雪地球物理测量和冰上气象观测描述了积雪的形成和结构。多层冰雪后向散射模型被用来反复添加和减去复杂的积雪的组件，以评估其对整体后向散射的影响。对于20°和70°之间的入射角，来自光滑的第一年海冰上的复杂积雪的后向散射明显高于来自类似海冰上的简单积雪的后向散射。敏感性分析表明，粗糙的冰层内形成的复杂的积雪和那些叠加在海冰界面的物理机制，影响增加表面和体积后向散射。这对海冰测绘、地球物理反演和积雪厚度研究具有影响。版权所有© 2014约翰威利父子有限公司.
We present a case study of observed and modelled C‐band microwave backscatter signatures for a complexly‐layered snow cover on smooth, land‐fast, first‐year sea ice. We investigate how complexly‐layered snow affects the backscatter, by comparing signatures with those for a simple snow cover, and through model sensitivity analysis. Backscatter signatures are obtained using a surface‐based scatterometer, on sea ice in Hudson Bay, Canada. Coincident in situ snow and ice geophysical measurements, and on‐ice meteorological observations, describe the snow cover formation and structure. A multilayer snow and ice backscatter model is used to iteratively add and subtract components of the complex snow cover to assess their impacts on the overall backscatter. For incidence angles between 20° and 70°, the backscatter from a complex snow cover on smooth first‐year sea ice is significantly higher than backscatter from a simple snow cover on similar sea ice. Sensitivity analysis suggests that rough ice layers formed within the complex snow cover and those superimposed at the sea ice interface are the physical mechanisms that affect an increase in surface and volume backscattering. This has implications for sea ice mapping, geophysical inversion and snow thickness studies. Copyright © 2014 John Wiley & Sons, Ltd.