Seven-year variation in glacier surface velocity at Narsap Sermia in Southwest Greenland ...

• Main Authors: Jung, Seong-Woo, Hong, Sang-Hoon
• Format: Text
• Language: unknown
• Published: Taylor & Francis 2023
• Subjects: Physical Sciences not elsewhere classified; Medicine; Environmental Sciences not elsewhere classified; Ecology; FOS Biological sciences; Astronomical and Space Sciences not elsewhere classified; Virology; Greenland; Narsap Sermia; glacier; Ice Sheet; Tidewater
• Online Access: https://dx.doi.org/10.6084/m9.figshare.22734230.v1; https://tandf.figshare.com/articles/journal_contribution/Seven-year_variation_in_glacier_surface_velocity_at_Narsap_Sermia_in_Southwest_Greenland/22734230/1

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 ...