Glacier fluctuations and a proglacial evolution in King George Bay (King George Island), Antarctica, since 1980 decade

• Published in: Anais da Academia Brasileira de Ciências
• Main Authors: KÁTIA K. DA ROSA, CLEIVA PERONDI, JÚLIA L. LORENZ, JEFFREY D. AUGER, PAMELA CAZAROTO, CARINA PETSCH, RAFAEL G. SIQUEIRA, JEFFERSON C. SIMÕES, ROSEMARY VIEIRA
• Format: Article in Journal/Newspaper
• Language: English
• Published: Academia Brasileira de Ciências 2023
• Subjects: Geographical Information System; polar regions; shrinkage environmental change; morainal landforms; climate change; Science; Q; George Bay; King George Bay; King George Island; Antarc*; Antarctica; Tidewater
• Online Access: https://doi.org/10.1590/0001-3765202320230624; https://doaj.org/article/c8626de9cf3443158477b3c59f948181

Abstract This study aims to investigate the glacier shrinkage and recent proglacial environment in King George Bay, Antarctica, since 1988 in response to climate change. Remote sensing data (SPOT, Sentinel, Landsat and Planet Scope images) were applied to glacial landforms and ice-marginal fluctuations mapping. Annual mean near-surface air temperature reanalysis solutions from ERA-Interim were analyzed. Moraines and glaciofluvial landforms were identified. The Ana Northern Glacier has the highest retreat value (3.64 km) (and area loss of 31%) in response to higher depth in frontal ice-margin and reveal ocean-glacier linkages. The Ana South Glacier changed from a tidewater glacier to land-terminating after 1995, and had an outline minimum elevation variation of 89 meters, a shrinkage of 0.63 km, and a new proglacial subaerial sector. The Ana South Glacier foreland had recessional moraines (probably formed between 1995 and 2022), lagoons, and lakes. There are many flutings in low-relief environments. The 1980-1989, 1990-1999, 2000-2009, 2010-2019 anomaly plots concerning to the 1980-2019 average for atmospheric temperature, are shown to be a driver of the local glacial trends.