Large discrepancies in the estimates of ice discharge from the Antarctic Peninsula when using different ice-thickness datasets ...

• Main Authors: Shahateet, Kaian, Navarro, Francisco, Seehaus, Thorsten, Fürst, Johannes, Braun, Matthias
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Antarctic; The Antarctic; Antarctic Peninsula; Antarc*; Antarctica; Ice Sheet
• Online Access: https://dx.doi.org/10.57757/iugg23-2336; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018453

<!--!introduction!--> The Antarctic Peninsula Ice Sheet (APIS) has become a significant contributor to sea-level rise over the last decades. It is crucial to estimate the ice discharge from the APIS outlet glaciers to understand the overall mass balance of Antarctica. In this study, we calculated the ice discharge from the APIS outlet glaciers north of 70 ºS employing four widely used ice-thickness reconstructions. By using a common surface velocity field and flux gates, we found that the estimation of the total volumetric ice discharge between 2014 and 2017 ranges from 52 to 134 km 3 /y, with a mean of 85 ± 37 km 3 /y. The significant differences between the results of the total ice discharge, as well as a multi-model normalized root-mean-squared deviation of 1.20 for the whole data set reveal large differences and inconsistencies between the ice-thickness models. This highlights a fundamental issue: the limited availability of accurate ice-thickness measurements and the challenges faced by current ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...