Observing the disintegration of the A68A iceberg from space

A. Braakmann-Folgmann*, A. Shepherd, L. Gerrish, J. Izzard, A. Ridout

*Corresponding author for this work

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Abstract

Icebergs impact the physical and biological properties of the ocean where they drift, depending on the degree of melting. We use satellite imagery and altimetry to quantify the area, thickness, and volume change of the massive A68A iceberg from its calving off the Larsen-C Ice Shelf in July 2017 until January 2021, when it disintegrated. A68A thinned from 235 ± 9 to 168 ± 10 m, on average, and lost 802 ± 34 Gt of ice in 3.5 years, 254 ± 17 Gt of which was through basal melting (a lower bound for the immediate fresh water input into the ocean). Basal melting peaked at 7.2 ± 2.3 m/month in the Northern Scotia Sea and an estimated 152 ± 61 Gt of freshwater was released off South Georgia, potentially altering the local ocean properties, plankton occurrence and conditions for predators.

Original languageEnglish
Article number112855
Number of pages9
JournalRemote Sensing of Environment
Volume270
Early online date10 Jan 2022
DOIs
Publication statusPublished - 1 Mar 2022
Externally publishedYes

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