哨兵1号影像在南极触地线提取中的应用与分析

doi:10.13474/j.cnki.11-2246.2023.0267

摘要/Abstract

摘要： 冰川触地线是内陆冰盖和漂浮冰架的分界线,其位置的准确界定对南极冰川物质平衡计算、冰川动力学建模、冰川变化和海平面变化研究具有重要意义。本文针对Sentinel-1A/B雷达影像数据在南极触地线大规模提取中的应用,基于2020年Sentinel-1A/B雷达影像数据,采用DDInSAR方法对南极触地线进行了大范围的提取,提取触地线约23 472 km,结合MEaSURE_GL、MOA_GL2009、MEaSUREs冰流速等数据对触地线提取结果进行综合分析。结果表明:利用DDInSAR方法和Sentinel-1A/B雷达影像数据可以实现对南极触地线长期、高效且较全面的提取,南极不同地区的触地线具有不同的变化特征,存在稳定、回退、前进、消失和冰升等多种变化现象。南极半岛和西南极可以完全应用6 d的Sentinel-1A/B雷达影像数据提取触地线,东南极大部分区域只能应用12 d的Sentinel-1A/B雷达影像数据提取触地线。潮汐运动的强弱影响触地线的提取质量,在西南极的强潮汐区域触地线提取质量较高,在东南极冰盖周围的弱潮汐区域触地线提取质量较差或者结果空缺。南极触地线的提取受冰流速影响较大,当冰流速超过400 m/a时,由于较大冰流速的存在使得触地线提取质量较差甚至无法提取触地线。在利用Sentinel-1A/B雷达影像数据提取南极触地线时,南极半岛和东南极优先选择秋季的影像数据,西南极优先选择夏季的影像数据。

关键词: 触地线, DDInSAR, 南极, Sentinel-1A/B, 冰流速, 潮汐运动

Abstract: The grounding line is the boundary between the inland grounded ice sheet and the floating ice shelf. Precise extraction of the grounding line has a great significance for the calculation of the material balance of Antarctic glaciers, the modeling of glacier dynamics, glacier changes and sea level changes. This paper aims at the application characteristics of Sentinel-1A/B radar image data in the large-scale extraction of Antarctic grounding line. Based on the Sentinel-1A/B radar image data in 2020 and the DDInSAR method, a large-scale extraction of the Antarctic grounding line is carried out.The grounding line is about 23 472 km.Combined with MEaSURE_GL, MOA_ Gl2009,MEaSUREs velocity and other data,we have comprehensive analyzed the grounding line extraction result.The result shows that using Sentinel-1A/B radar image data and DDInSAR method can realize long-term, efficient and comprehensive extraction of Antarctic grounding line.The grounding line in different regions of Antarctica has different changing characteristics, including stability, retreat, advance, disappearance and ice rise.In the Antarctic Peninsula and the West Antarctic, we can use the 6 d Sentinel-1A/B radar image data to extract the grounding line. In the large part of the Eest Antarctic,we can only use the 12 d Sentinel-1A/B radar image data to extract the grounding line.The strength of tidal motion affects the quality of the grounding line extraction, the grounding line extraction quality is higher in the strong tidal area of the West Antarctic, and the grounding line extraction quality in the weak tidal area around the East Antarctic ice sheet is poor or the result is vacant.The extraction of the Antarctic grounding line is greatly affected by the ice velocity, when the ice velocity exceeds 400 m/a, the extraction quality of the grounding line is poor or even unable to extract due to the existence of the large ice velocity.When using Sentinel-1A/B radar image data to extract the Antarctic grounding line, the image data of the Antarctic Peninsula and the East Antarctic are preferentially selected during the autumn period, and the image data of the West Antarctic during the summer period are preferentially selected.

Key words: grounding line, DDInSAR, Antarctic, Sentinel-1A/B, ice velocity, tidal motion

中图分类号:

P237

赵现仁, 邢喆, 张峰, 郭灿文, 王晶, 孙毅, 马永, 赵彬如, 王剑. 哨兵1号影像在南极触地线提取中的应用与分析[J]. 测绘通报, 2023, 0(9): 70-76.

ZHAO Xianren, XING Zhe, ZHANG Feng, GUO Canwen, WANG Jing, SUN Yi, MA Yong, ZHAO Binru, WANG Jian. Application and analysis of Sentinel-1 images in Antarctic grounding line extraction[J]. Bulletin of Surveying and Mapping, 2023, 0(9): 70-76.

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