Sea-ice surface roughness estimates from airborne laser scanner and laser altimeter observations in Fram Strait and north of Svalbard
Sea-ice surface roughness estimates from airborne laser scanner and laser altimeter observations in Fram Strait and north of Svalbard
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DOI：
10.3189/2015aog69a717
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发表时间：
2015-01-01
影响因子：
2.9
通讯作者：
Haas, Christian
中科院分区：
文献类型：
--
作者：
Beckers, Justin F.;Renner, Angelika H. H.;Haas, Christian
我们提出了 2010 年通过机载激光扫描仪和单光束激光高度计获得的弗拉姆海峡北极地区和斯瓦尔巴群岛北部南森盆地的海冰表面粗糙度估计值，即相对表面高程的标准差。我们将扫描仪与高度计进行了比较，并比较了两个测量区域之间的差异。我们使用扫描仪在平坦表面上的双曲线响应根据扫描仪数据估计并校正传感器滚动。在扫描仪和高度计的表面粗糙度统计分布变得相似之前，测量调查必须在斯瓦尔巴群岛以北超过 5 公里，在弗拉姆海峡超过 15 公里。表面粗糙度概率分布的形状与冰厚度的机载电磁感应测量的形状一致。与南森盆地的冰相比，弗拉姆海峡的冰具有更大的平均表面粗糙度（0.16 m vs 0.09 m），并且粗糙度值的分布更广泛。在格陵兰岛海岸附近的弗拉姆海峡发现的固定冰上观察到表面粗糙度随着冰厚度的增加而增加，但流冰却没有。
We present sea-ice surface roughness estimates, i.e. the standard deviation of relative surface elevation, in the Arctic regions of Fram Strait and the Nansen Basin north of Svalbard acquired by an airborne laser scanner and a single-beam laser altimeter in 2010. We compare the scanner to the altimeter and compare the differences between the two survey regions. We estimate and correct sensor roll from the scanner data using the hyperbolic response of the scanner over a flat surface. Measurement surveys had to be longer than 5 km north of Svalbard and longer than 15 km in Fram Strait before the statistical distribution in surface roughness from the scanner and altimeter became similar. The shape of the surface roughness probability distributions agrees with those of airborne electromagnetic induction measurements of ice thickness. The ice in Fram Strait had a greater mean surface roughness, 0.16 m vs 0.09 m, and a wider distribution in roughness values than the ice in the Nansen Basin. An increase in surface roughness with increasing ice thickness was observed over fast ice found in Fram Strait near the coast of Greenland but not for the drift ice.