O QUE A BUSCA PELO GELO MAIS ANTIGO DO PLANETA PODE REVELAR SOBRE O CLIMA
Autor: Gilmar Mendes da Silva | Publicado: 2016-12-22T11:56:00-02:00




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<![endif]-->Uma
equipe de cientistas está trabalhando na Antártida para encontrar a geleira
mais antiga do mundo. Eles querem perfurar o gelo e retirar amostras que
permitam descobrir rastros das mudanças climáticas do passado. 

A ideia
do grupo é tentar estender o conhecimento que se tem do clima passado.

“Nós
temos um excelente registro sobre o que aconteceu no clima nos últimos 800 mil
anos, mas ainda há aspectos que não conseguimos explicar plenamente”, disse
Robert Mulvaney, que faz parte do grupo de pesquisas britânico sobre a
Antártida (BAS, na sigla em inglês).

“Estudando
geleiras que tem 1,5 milhão de anos, isso poderá nos dar a convicção de que
realmente entendemos bem o sistema climático, que podemos ter certeza absoluta
de que o que estamos projetando para as próximas centenas de anos se baseia em
um estudo completo e no conhecimento da Ciência ", disse ele à BBC.

Uma
análise química de um pedaço de gelo antigo pode trazer várias informações
sobre como era o clima na região no passado – e como ele foi mudando ao longo
dos séculos.

Quando o
gelo é trazido à superfície, ele é cortado em pedaços para ser estudado. Até
elementos químicos presos em bolhas de ar entre flocos de neve são examinados
minuciosamente. Dessa forma, cientistas são capazes de mapear as temperaturas e
a atividade solar de séculos passados.
Espera-se que esses dados ajudem os cientistas a
fazer previsões mais precisas sobre como as condições climáticas no planeta
podem se desenvolver no futuro