Simulated effects of a snow layer on retrieval of CryoSat‐2 sea ice freeboard
Simulated effects of a snow layer on retrieval of CryoSat‐2 sea ice freeboard
复制标题
雪层对 CryoSat-2 海冰干舷反演的模拟影响
DOI：
10.1002/2014gl060993
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发表时间：
2014
影响因子：
5.2
通讯作者：
Ron Kwok
中科院分区：
文献类型：
--
作者：
Ron Kwok
模拟了雪层对CryoSat-2合成孔径干涉雷达高度计波形中海冰表面测距跟踪点（RP）位置的影响。在距离分辨率约为47 cm的情况下，空气-雪（a-s）界面的响应扩大了雪-冰（s-i）界面的响应，并将RP移向高度计。当它们的返回强度相当时，当雪厚度>20厘米时，这种影响最大。另一方面，RP位移远离高度计时，在雪层中的传播速度降低不占。这种分析探讨雪的厚度和相对散射强度的接口和两种不同的跟踪方法（前缘和质心），这些雪参数的敏感性，这些竞争的校正的依赖性。预期的误差取决于更好地了解界面和雪层的相对散射强度。
The impact of a snow layer on the location of the tracking point (RP) for ranging to the sea ice surface in CryoSat‐2 synthetic aperture interferometric radar altimeter waveforms is simulated. With a range resolution of ~47 cm, the response of the air‐snow (a‐s) interface broadens the response of the snow‐ice (s‐i) interface and displaces the RP toward the altimeter. This effect is largest when the strengths of their returns are comparable and when snow thicknesses are >20 cm. On the other hand, the RP is displaced away from the altimeter when the reduced propagation speed in the snow layer is not accounted for. This analysis examines the dependence of these competing corrections on snow thickness and the relative scattering strengths of the interfaces and the sensitivity of two different tracking approaches (leading edge and centroid) to these snow parameters. Expected errors depend on a better understanding of the relative scattering strengths of the interfaces and snow layer.