Detection of Landfast Sea Ice Near Jang Bogo Antarctic Research Station Using Layer-Stacked Sentinel-1 Interferometric SAR Coherence Images

Seung Hee Kim; Hyangsun Han

doi:10.9720/kseg.2022.2.271

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2022 Vol.32, Issue 2 Preview Page Next Page

Research Article

Detection of Landfast Sea Ice Near Jang Bogo Antarctic Research Station Using Layer-Stacked Sentinel-1 Interferometric SAR Coherence Images Sentinel-1 영상레이더 간섭 긴밀도 영상의 레이어 병합을 활용한 남극 장보고 과학기지 주변 정착해빙 탐지

30 June 2022. pp. 271-280

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Abstract

Landfast sea ice forms near coastlines in polar regions. Continuous monitoring of this sea ice is important, as it plays a key role in the marine ecosystem and affects the operation of nearby research stations. This study detected landfast sea ice around Jang Bogo research station in East Antarctica by stacking interferometric coherence images of Sentinel-1 synthetic aperture radar (SAR) data with 6-, 12- and 18-day temporal baselines. A total of 50 landfast sea ice maps were generated covering July 2017 to June 2018. The time series revealed regional differences in the timing of the maximum extent as well as growth rate of landfast sea ice. Overall, detecting landfast sea ice using interferometric SAR coherence seems promisingly feasible; however, limitations remain owing to low backscattering coefficients from new and smooth sea ice surfaces and subtle movements of sea ice in contact with the Campbell Glacier Tongue.

Keywords

landfast sea ice

synthetic aperture radar

coherence

Antarctica

Sentinel-1

정착해빙은 극지역 해안에 형성되는 고착된 해빙으로, 해양 생태계와 해안에 위치한 과학기지들의 운용에 큰 영향을 끼치는 중요한 인자이기 때문에 지속적인 관측이 중요하다. 본 연구에서는 6, 12, 18일의 시간 기선을 가지는 Sentinel-1 영상레이더(synthetic aperture radar, SAR) 간섭 긴밀도 영상들을 레이어 병합하여 동남극 장보고 과학기지 주변의 정착해빙을 탐지하였다. 2017년 7월부터 2018년 6월까지 총 50장의 간섭 긴밀도 영상을 제작하였으며, 이로부터 1년간의 정착해빙 면적 변화를 도출하였다. Campbell 빙하설을 기준으로 동쪽과 서쪽에서 정착해빙의 면적이 최대가 되는 시기가 상이함을 확인하였다. 이 연구를 통하여 SAR 간섭 긴밀도를 활용한 정착해빙 탐지 가능성을 확인하였으나, 생성 시간이 짧거나 부드러운 표면을 가져 작은 레이더 후방산란을 보이는 정착해빙과 Campbell 빙하설의 흐름 및 붕괴로 인해 급작스러운 움직임을 보이는 빙하설 인접 지역에서의 정착해빙이 미탐지 되는 한계점은 개선이 필요할 것으로 보인다.

키워드

정착해빙

영상레이더

긴밀도

남극

Sentinel-1

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Information

Publisher :Korean Society of Engineering Geology
Publisher(Ko) :대한지질공학회
Journal Title :The Journal of Engineering Geology
Journal Title(Ko) :지질공학
Volume : 32
No :2
Pages :271-280
Received Date : 2022-06-11
Revised Date : 2022-06-24
Accepted Date : 2022-06-26
DOI :https://doi.org/10.9720/kseg.2022.2.271

The Journal of Engineering Geology ISSN:1226-5268(Print) 2287-7169(Online) 지질공학

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