HYDROLOGICAL DEVELOPMENT AND PHENOLOGY OF LAKES OF THE FILDES PENINSULA – ANTARCTICA: Hydrological development and phenology of lakes of the Fildes Peninsula - Antarctica

This paper evaluates the freezing and thawing dynamics of the Fildes Peninsula lakes using TerraSAR-X (TSX) images from February to April 2011, and the correlation of the open water surface area with temperature, precipitation and wind. The open water surface area was obtained from the TSX images cl...

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Bibliographic Details
Published in:Geosciences = Geociências
Main Authors: PETSCH, Carina, MATTOS COSTA, Rafaela, KELLEM DA ROSA, Kátia, VIEIRA, Rosemary, BRAUN, Matthias Holger, SIMÕES, Jefferson Cardia
Format: Article in Journal/Newspaper
Language:Portuguese
Published: Instituto de Geociências e Ciências Exatas - Campus de Rio Claro - UNESP 2020
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Online Access:https://www.periodicos.rc.biblioteca.unesp.br/index.php/geociencias/article/view/14453
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Summary:This paper evaluates the freezing and thawing dynamics of the Fildes Peninsula lakes using TerraSAR-X (TSX) images from February to April 2011, and the correlation of the open water surface area with temperature, precipitation and wind. The open water surface area was obtained from the TSX images classification using the MAXVER classifier for 12 images from 2011. The correlation of atmospheric air temperature with the area, determined by the Pearson and Spearman correlation method, demonstrates a significant correlation pattern in 7 of the 15 lakes, while precipitation is an important variable for the formation of open water in 11 of the 15 lakes. All lakes facing the Drake Passage show significant correlation with wind direction. It is possible that the wind acts causing waves on the liquid surface, which in turn cause the surface ice to break. As for wind direction, this variable may be linked to changes in the duration of the ablation period for the Fildes peninsula. In general, the TSX images allowed an unprecedented temporal detailing for the study area, making it possible to map the lakes from February to April 2011. Este artigo avalia a dinâmica de congelamento e descongelamento dos lagos da península Fildes, utilizando imagens TerraSAR-X (TSX) entre fevereiro e abril de 2011, e a correlação da área de superfície líquida com as variáveis temperatura, precipitação e vento. A área de superfície líquida foi obtida a partir de classificação de imagem TSX, utilizando o classificador MAXVER, para 12 imagens do ano de 2011. A correlação de temperatura do ar atmosférico com a área, determinada pelo método de correlação de Spearman e Pearson, demonstra padrão de correlação significativa em 7 dos 15 lagos, enquanto a precipitação é uma importante variável na formação da superfície líquida em 11 dos 15 lagos. Todos os lagos voltados para a passagem de Drake mostram correlação significativa coma direção do vento que atua causando ondas na superfície líquida e que, por sua vez, provocam a quebra do gelo na ...