Retrieval of Svalbard ice flow velocities using Sentinel 1A/1B three-pass Differential SAR Interferometry

• Main Authors: Nela, Bala Raju, Singh, Gulab, Mohanty, Shradha, Rajat, Arigony-Neto, Jorge, Glazovsky, Andrey F.
• Format: Text
• Language: unknown
• Published: Taylor & Francis 2022
• Subjects: Space Science; Medicine; Cell Biology; Molecular Biology; 59999 Environmental Sciences not elsewhere classified; FOS Earth and related environmental sciences; 39999 Chemical Sciences not elsewhere classified; FOS Chemical sciences; Sociology; FOS Sociology; 69999 Biological Sciences not elsewhere classified; FOS Biological sciences; Svalbard; glacier
• Online Access: https://dx.doi.org/10.6084/m9.figshare.19140220.v1; https://tandf.figshare.com/articles/journal_contribution/Retrieval_of_Svalbard_ice_flow_velocities_using_Sentinel_1A_1B_three-pass_Differential_SAR_Interferometry/19140220/1

Glacier velocity is an important parameter to characterize glacier dynamics and to derive ice thickness and mass balance. The 2-pass/3-pass Differential Synthetic Aperture Radar Interferometry (DInSAR) techniques are advantageous in estimating glacier movements. However, the 2-pass DInSAR requires an external Digital Elevation Model (DEM), whereas the 3-pass DInSAR does not. The 3-pass DInSAR technique is adopted with Sentinel-1A/1B to map the Svalbard glacier flow velocities. Furthermore, the effect of glacier surface elevation change on the 2-pass DInSAR results were revealed by comparing glacier velocity with the two time period topographic information. The coherence indicates that Sentinel-1A/1B has a high potential to infer operational glacier velocity using the 3-pass DInSAR method with an average atmospheric uncertainty of 0.24 cm/day over the studied region. The precision of the 3-pass DInSAR is analyzed by comparing 2-pass derived line-of-sight (LOS) velocity on the same dates. The 3-pass DInSAR achieves high-resolution and detailed information.