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Estudo do colapso da superfície da geleira Dark na Antártica Oriental com base nos dados REMA

  • role： First author第一作者
  • Affiliation：

    Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430079, China

  • Email：ttliu23@whu.edu.cn
  • Introduction：刘婷婷，研究方向为极地遥感应用、遥感图像处理。E-mail： ttliu23@whu.edu.cn
LIU Tingting,  
  • role： Corresponding author通信作者
  • Affiliation：

    Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430079, China

  • Email：dingruilxm@whu.edu.cn
  • Introduction：丁锐， 研究方向为冰川动力学。E-mail： dingruilxm@whu.edu.cn
DING Rui*,  
  • Affiliation：

    Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430079, China

AI Songtao,  
  • Affiliation：

    Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430079, China

ZHANG Baojun,  
  • Affiliation：

    Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430079, China

WANG Zemin

Resumo

O aquecimento global afeta gravemente a estabilidade das geleiras, com colapsos ocorrendo na superfície de várias geleiras na Antártica. Devido à falta de modelos digitais de elevação (DEM) de alta resolução espacial e temporal para a superfície da Antártica, os estudos atuais sobre as variações espaço-temporais da superfície de uma única geleira são insuficientes. Utilizando dados do Modelo de Elevação de Referência da Antártica REMA de 11 períodos entre 2011 e 2016, foi realizado o monitoramento das mudanças de elevação na área de colapso da superfície da geleira Dark na Antártica Oriental, além da análise dos processos e causas do colapso com dados ópticos Landsat 7/8 e Worldview-2. Os resultados mostram que, em 2013, ocorreu um evento de colapso severo na geleira Dark, com profundidade máxima de aproximadamente 45,29 m, resultando na perda de cerca de 26,29×106 m3 de água; após o colapso, a elevação da superfície nesta área aumentou continuamente, recuperando-se até a elevação anterior ao colapso em 2016. A área de colapso apresenta características claras de subsidência geral e acúmulo de água de degelo, e supõe-se que haja uma relação estreita entre o colapso e o processo de drenagem do lago subglacial da geleira Dark. Este estudo comprova a grande instabilidade da geleira Dark e valida a viabilidade do monitoramento do colapso da superfície dos glaciares por meio dos dados REMA, oferecendo uma referência técnica para o monitoramento detalhado futuro da resposta da camada de gelo/ plataforma de gelo da Antártica às mudanças climáticas.

Palavras-chave

Antártica, geleira Dark, colapso da superfície, mudança climática, REMA;Modelo;Digital;de;Elevação, sensoriamento remoto, dados Landsat, dados Worldview

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