Home » Ciência » Natureza e Meio Ambiente » AntA?rtica perdeu ai???uma Londresai??? de gelo marinho subterrA?neo em seis anos

AntA?rtica perdeu ai???uma Londresai??? de gelo marinho subterrA?neo em seis anos

FenA?meno pode ter implicaAi??Ai??es para o aumento do nAi??vel do mar global

Um novo estudo publicado na revistaAi??Nature GeoscienceAi??mostra que oceano AntA?rtico perdeu uma A?rea de 1.463 quilA?metros quadrados de gelo submarino entre 2010 e 2016, o equivalente Ai?? A?rea de Londres.

Pela primeira vez, os pesquisadores do Centro de ObservaAi??A?o Polar e Modelagem da Universidade de Leeds, no Reino Unido, conseguiram dimensionar com precisA?o a perda que ocorre nas plataformas de gelo no fundo do mar.

A penAi??nsulaAi??AntA?rticaAi??Ai?? um dos lugares de aquecimento mais rA?pido no planeta. As temperaturas na costa oeste subiram cerca de 2,9 graus Celsius (A?C) nos A?ltimos 60 anos, cerca de trA?s vezes a mAi??dia global, enquanto as temperaturas da superfAi??cie do mar subiram mais de 1A?C.

ai???A AntA?rtica estA? derretendo em sua base. NA?s nA?o podemos ver esse processo porque estA? acontecendo abaixo da superfAi??cie do marai???, disse o professor Andrew Shepherd, um dos autores do estudo, ao jornal britA?nicoAi??The Guardian.

A equipe produziu o primeiro mapa completo mostrando que a borda submarina das geleiras, tambAi??m chamada ai???linha de aterramentoai???, estA? mudando. Ela representa o limite entre a geleira e seu apoio sobre o leito marinho.

(Hannes Konrad et al./Universidade de Leeds/DivulgaAi??A?o)

As linhas de aterramento sA?o um indicador-chave da instabilidade do manto de gelo, porque as mudanAi??as em sua posiAi??A?o refletem o desequilAi??brio com o oceano circundante e afetam o fluxo do gelo interno. Registros desse processo sA?o importantes para os cientistas avaliarem a escala do desequilAi??brio.

O estudo indica que o recuo da linha de aterramento foi extremo em oito dos 65 maiores glaciares da regiA?o. O ritmo do degelo desde a A?ltima era glacial Ai?? de aproximadamente 25 metros por ano. O recuo da linha de aterramento nessas geleiras Ai?? cinco vezes maior que essa taxa.

Os pesquisadores tambAi??m identificaram comportamentos inesperados no gelo marinho. Embora o recuo da linha de aterramento da geleira Thwaites na AntA?rtica Ocidental tenha acelerado, na geleira vizinha de Pine Island ai??i?? atAi?? recentemente uma das que mais recuou no continente ai??i?? nA?o houve mudanAi??a. Isso sugere que o derretimento do gelo subterrA?neoAi??pode ter parado nessa A?rea.

Segundo os cientistas, essas diferenAi??as enfatizam a natureza complexa da instabilidade das camadas de gelo em todo o continente, e a capacidade de detectA?-las ajuda os cientistas a identificar as A?reas que merecem mais investigaAi??A?o.

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