Surface roughness from in-situ measurements around Indian Antarctic stations

IF 1.5 4区地球科学 Q3 ECOLOGY

Polar Science Pub Date : 2023-12-01 DOI:10.1016/j.polar.2023.100971

Megha Maheshwari , Kamaljit Singh Rajkumar , Jayaprasad Pallipad , Dhani Ram Rajak , Sandip Rashmikant Oza , Raj Kumar

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引用次数: 0

Abstract

Surface roughness is an important parameter in deriving energy balance over the polar ice-sheets and glaciers. In Antarctica, roughness appears as snow patches and is affected by wind transport. It is also influenced by snowfall, snowdrifts, snowmelt, and snow grain size. In this paper, we derive surface roughness using a laser distometer. The roughness measurements were collected during the 32nd Indian Scientific Expedition to Antarctica 2013 (ISEA-32). After removal of all the possible error sources, it is found that around the Indian Antarctic station Bharati (69.41°S, 76.18°E), roughness is in the range of 0.7–1.2 cm. Snowfall and wind introduce fluctuations in surface roughness measurements. Measurements around Maitri (70.76°S, 11.73°E) showed that different ice surfaces have different values of roughness (0.6–1.4 cm), with the minimum roughness in the interior ice sheet surrounded by hummocks. Sastrugi patterns were also captured in the analysis. Backscattering signatures from RADARSAT-2 imagery were examined in conjunction with the roughness measurements.

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印度南极站周围现场测量的表面粗糙度

表面粗糙度是推导极地冰原和冰川能量平衡的一个重要参数。在南极洲，粗糙度表现为雪斑，并受风的传播影响。它还受到降雪、雪堆、融雪和雪粒大小的影响。在本文中，我们利用激光粒度仪得出了表面粗糙度。粗糙度测量数据是在 2013 年第 32 次印度南极科学考察（ISEA-32）期间收集的。在剔除所有可能的误差源后，我们发现印度南极站 Bharati（69.41°S，76.18°E）周围的粗糙度在 0.7-1.2 厘米之间。降雪和风导致表面粗糙度测量值波动。在麦特里（南纬 70.76 度，东经 11.73 度）附近的测量结果显示，不同冰面的粗糙度值（0.6-1.4 厘米）不同，内部冰层的粗糙度最小，周围是驼峰。分析还捕捉到了 Sastrugi 模式。结合粗糙度测量结果，对雷达卫星-2 图像的反向散射特征进行了研究。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Polar Science ECOLOGY-GEOSCIENCES, MULTIDISCIPLINARY

CiteScore

3.90

自引率

5.60%

发文量

期刊介绍： Polar Science is an international, peer-reviewed quarterly journal. It is dedicated to publishing original research articles for sciences relating to the polar regions of the Earth and other planets. Polar Science aims to cover 15 disciplines which are listed below; they cover most aspects of physical sciences, geosciences and life sciences, together with engineering and social sciences. Articles should attract the interest of broad polar science communities, and not be limited to the interests of those who work under specific research subjects. Polar Science also has an Open Archive whereby published articles are made freely available from ScienceDirect after an embargo period of 24 months from the date of publication. - Space and upper atmosphere physics - Atmospheric science/climatology - Glaciology - Oceanography/sea ice studies - Geology/petrology - Solid earth geophysics/seismology - Marine Earth science - Geomorphology/Cenozoic-Quaternary geology - Meteoritics - Terrestrial biology - Marine biology - Animal ecology - Environment - Polar Engineering - Humanities and social sciences.