INVENTÁRIO DE LAGOS GLACIAIS NAS ILHAS NELSON E REI GEORGE, ANTÁRTICA MARÍTIMA

This study presents the first glacial lake inventory for Nelson and King George Island forelands, Maritime Antarctica. Landsat, Digital Globe, Planet Scope and Sentinel 2 data and Google Earth mapping were applied in lake identification. The geomorphometric characteristics were obtained with TanDEM-...

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Bibliographic Details
Published in:Caminhos de Geografia
Main Authors: Araujo Gonçalves de Oliveira, Manoela, Petsch, Carina, Kellem da Rosa, Kátia, Vieira, Rosemary, Mattos Costa, Rafaela, Perondi, Cleiva, Cardia Simões, Jefferson
Format: Article in Journal/Newspaper
Language:Portuguese
Published: EDUFU - Editora da Universidade Federal de Uberlândia 2021
Subjects:
Áreas livres de gelo
Ambiente marginal ao gelo
Paraglacial
SIG
Forelands
Ice-marginal environment
Paraglacia
GIS
Barton
Barton Peninsula
Fildes
George Bay
Glacial Lake
King George Bay
King George Island
Nelson Island
Weaver
Antarc*
Antarctica
Antártica
Online Access:https://seer.ufu.br/index.php/caminhosdegeografia/article/view/54688
https://doi.org/10.14393/RCG228054688
Description
Summary:This study presents the first glacial lake inventory for Nelson and King George Island forelands, Maritime Antarctica. Landsat, Digital Globe, Planet Scope and Sentinel 2 data and Google Earth mapping were applied in lake identification. The geomorphometric characteristics were obtained with TanDEM-X and REMA. There are 56 glacial lakes covering areas of 320.000 in Nelson Island, and 144 lakes covering areas of 2.016.169 in King George Island. There lakes are primarily located in coastal sectors (0-40m elevation) and lower slopes (0-20%) terrains in islands. There are lakes in forelands related to recent (i.g. ice-marginal and ice-contact lakes in proglacial areas presented in Admiralty and King George Bay) and old deglaciation (e.g. Harmony, Stanbury, Fildes, Potter, Weaver and Barton Peninsula). The lakes were not identified in Northern sectors of the islands. The characterization of the lakes can assist in the explanation of possible differences of secular evolution of the lakes, therefore the sprouting of lakes in the sectors frontals of glaciers shows how much these are unstable to the heating in the region, and of this form we can infer on the dynamics of each one of them. O presente trabalho apresenta o primeiro inventário dos lagos glaciais nas áreas livres de gelo nas ilhas Rei George e Nelson, Antártica Marítima. Foram usadas imagens Landsat, Digital Globe, Planet Scope e Sentinel 2 para vetorização e mapeamento dos lagos através do Google Earth. Para a análise geomorfométrica foram utilizados os MDE Tandem-X e REMA. Há 56 lagos na ilha Nelson e 144 lagos na ilha Rei George, cobrindo um total de 320.000 m² de área e 2.016.169 m² de área, respectivamente. Os lagos se distribuem principalmente nos setores costeiros com baixas declividades (0-20%) e elevações (0-40m) nas áreas expostas das ilhas. Os lagos são formados em setores recentemente em deglaciarização (os lagos de contato com o gelo e marginais ao gelo, como por exemplo, nas áreas proglaciais na baía do Almirantado e Rei George) e ...

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