Estimating thin ice thickness around Svalbard using MODIS satellite imagery

IF 1.4 4区地球科学 Q3 GEOGRAPHY, PHYSICAL

Geografiska Annaler Series A-Physical Geography Pub Date : 2022-04-03 DOI:10.1080/04353676.2022.2070158

Ø. Rudjord, R. Solberg, G. Spreen, S. Gerland

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引用次数: 1

Abstract

ABSTRACT Information about the state of the Arctic sea ice is becoming increasingly important. This paper describes an approach for automatic retrieval of daily thin sea ice thickness maps around Svalbard. The algorithm uses thermal satellite imagery from MODIS to estimate the surface temperature of the ice and further uses a thermal model of the ice surface to estimate the thickness of the sea ice. The approach is usable for thin sea ice, up to ca. 50 cm thick, during cold weather (freezing) conditions and without cloud cover present. The algorithm is compared with helicopter-borne electromagnetic ice thickness measurements. The comparison yields increasing root-mean-square deviation (RMSD) for thicker ice. The lowest RMSD found is 8.7 cm for ice thickness in the range 10 cm < hi ≤ 20 cm. The highest RMSD found is 25.2 cm for ice thickness in the range 30 cm < hi ≤ 40 cm. The bias shows no such trend, and the overall bias is found to be −5.5 cm. The results show that this is a promising approach, allowing monitoring of thin sea ice thickness at relatively higher spatial resolution.

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利用MODIS卫星图像估计斯瓦尔巴群岛周围的薄冰厚度

关于北极海冰状况的信息变得越来越重要。本文介绍了一种自动检索斯瓦尔巴群岛周边海冰薄厚度图的方法。该算法利用MODIS卫星热像图估算海冰表面温度，并利用海冰表面热模型估算海冰厚度。这种方法适用于在寒冷天气(冰冻)和没有云层覆盖的情况下，厚度约为50厘米的薄海冰。将该算法与直升机机载电磁测冰厚度进行了比较。比较结果表明，冰越厚，均方根偏差(RMSD)越大。在10 cm < hi≤20 cm范围内，冰厚RMSD最小值为8.7 cm。在30 cm < hi≤40 cm范围内，冰厚RMSD最大值为25.2 cm。偏置没有这种趋势，总体偏置为−5.5 cm。结果表明，这是一种很有前途的方法，可以以相对较高的空间分辨率监测薄海冰厚度。

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

Geografiska Annaler Series A-Physical Geography 地学-地质学

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Geografiska Annaler: Series A, Physical Geography publishes original research in the field of Physical Geography with special emphasis on cold regions/high latitude, high altitude processes, landforms and environmental change, past, present and future. The journal primarily promotes dissemination of regular research by publishing research-based articles. The journal also publishes thematic issues where collections of articles around a specific themes are gathered. Such themes are determined by the Editors upon request. Finally the journal wishes to promote knowledge and understanding of topics in Physical Geography, their origin, development and current standing through invited review articles.