The effect of aeolian deposition on the surface roughness of melting snow, Byers Peninsula, Antarctica
The effect of aeolian deposition on the surface roughness of melting snow, Byers Peninsula, Antarctica
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风沉积对南极洲拜尔斯半岛融雪表面粗糙度的影响
DOI：
10.1002/hyp.7661
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发表时间：
2010
影响因子：
3.2
通讯作者：
Z. C. Whitt
中科院分区：
文献类型：
--
作者：
S. Fassnacht;M. Velasco;P. Meiman;Z. C. Whitt
积雪的表面是空气运动的底部边界层，其粗糙度影响空气动力学。风积物在积雪上的存在降低了积雪的覆盖度，并降低了表面的粗糙度。在南极洲南设得兰群岛的利文斯顿岛拜尔斯半岛的湖泊极地盆地融雪期间，风将粗糙的土壤颗粒（1-4 mm颗粒）从裸露、干燥和无雪的区域移动到邻近的积雪区。这种大的土壤颗粒的加入迅速改变了积雪表面的特征。在几天之内，最初出现在融化的雪表面上的太阳杯已经在雪表面上沉积土壤的区域被弄平。积雪表面的差异进行了评估，使用数字图像的粗糙度板插入到雪中，平行和垂直于主导风向。随机粗糙度是两倍的变量相比，干净的雪与土壤的雪，它是27%以上和26%以下的垂直与平行于风的干净的雪和雪与土壤，分别。变异函数分析表明，在55 × 55 cm的分析区域内，干净的雪有多达四种不同的粗糙度尺度，分形维数从1.33到1.83不等。在0·1 ~ 55 cm的范围内，雪与土壤的分形维数在平行和垂直于风的方向上没有显著变化，分形维数为1·65。版权所有© 2010约翰威利父子有限公司.
The surface of the snowpack is the bottom boundary layer for air movement, and its roughness influences aerodynamics. The presence of aeolian deposits on a snowpack decreases its albedo and is shown to decrease the roughness of the surface. During snowmelt in the Lake Limnopolar basin on Byers Peninsula of Livingston Island of the South Shetland Islands, Antarctica, wind moved coarse soil grains (1–4 mm particles) from a bare, dry and snow‐free area to an adjacent snowpack. This addition of large soil particles rapidly changed the snowpack surface characteristics. Within several days, the sun‐cups, initially present on the melting snow surface, had been smoothed out in areas where soil was deposited on the snow surface. The differences in the snowpack surface were assessed using digital imagery of a roughness board inserted into the snow, both parallel and perpendicular to the dominant wind direction. The random roughness was twice as variable for the clean snow compared to the snow with soil; it was 27% more and 26% less perpendicular versus parallel to the wind for the clean snow and snow with soil, respectively. Variogram analysis showed that the clean snow had up to four different scales of roughness over the 55 × 55 cm area of analysis, with fractal dimensions varying from 1·33 to 1·83. The snow with soil did not vary substantially from 0·1 to 55 cm with fractal dimensions of 1·65 in parallel and perpendicular to the wind. Copyright © 2010 John Wiley & Sons, Ltd.