Inferring Mass Loss by Measuring Contemporaneous Deformation around the Helheim Glacier, Southeastern Greenland, Using Sentinel-1 InSAR

authored by

Zohreh Erfani Jazi, Mahdi Motagh, Volker Klemann

Abstract

The elastic response of solid earth to glacier and ice sheet melting, the most important consequences of climate change, is a contemporaneous uplift. Here, we use interferometric synthetic aperture radar (InSAR) measurements to detect crustal deformation and mass loss near the Helheim glacier, one of the largest glaciers in southeastern Greenland. The InSAR time series of Sentinel-1 data between April 2016 and July 2020 suggest that there is a maximum cumulative displacement of ~6 cm in the line of sight (LOS) direction from the satellite to the ground near Helheim. We use an exponentially decreasing model of the thinning rate, which assumes that the mass loss starts at the lower-elevation terminal region of the glacier and continues to the higher-elevation interior. A linear inversion of the derived crustal uplift in the vicinity of bedrock using this model for surface loading in an elastic half-space suggests a mass loss of 8.33 Gt/year, which agrees with the results from other studies.

Organisation(s)

Institute of Photogrammetry and GeoInformation (IPI)

External Organisation(s)

University of Tehran
Helmholtz Centre Potsdam - German Research Centre for Geosciences (GFZ)

Type

Article

Journal

Remote sensing

Volume

14

ISSN

2072-4292

Publication date

15.08.2022

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

General Earth and Planetary Sciences

Sustainable Development Goals

SDG 13 - Climate Action

Electronic version(s)

https://doi.org/10.3390/rs14163956 (Access: Open)