fnctId=thesis,fnctNo=368
Seven-year variation in glacier surface velocity at Narsap Sermiain Southwest Greenland.
- 작성자
- 윤성효
- 저자
- Jung, S. W., & Hong, S. H.
- 발행사항
- 발행일
- 02 May 2023
- 저널명
- GIScience & Remote Sensing
- 국문초록
- 영문초록
- Glacier velocity is a critical factor closely related to ice dynamics of the Greenland ice sheet (GrIS). We present variations of ice velocity using space-based synthetic aperture radar (SAR) observations from July 2013 to September 2020. We focus on a tidewater outlet glacier of Narsap Sermia (NS), located in southwest Greenland, which is experiencing significant ice loss. A time series of high spatiotemporal resolution maps of ice velocity was traced by using an offset tracking approach with seven-year SAR acquisitions to understand glacier dynamics in time. We observed seasonal variations showing a dramatic increase in late spring (May) and early summer (June) followed by a sharp decrease in late summer (September). The seasonal variation was confirmed through Seasonal and Trend decomposition using Loess (STL) analysis. Overall, the NS glacier experienced a gradual speed-up of ice velocities. The ice velocity increased by 0.1?0.3?km/year from 2015 to 2017, then after a temporary decrease in 2018, the velocity moved faster by 0.9?km/year in 2020. The speed of glacier movement accelerated as it approached the tidal terminus of the glacier, showing approximately 6.0?km/year in 2020. The ice speed in 2020 increased by 0.9?km/year at the terminus region compared with 2014. We also discuss the relationship between the glacier velocity and temperature data such as air, land surface, and sea surface temperatures.
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