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Maior iceberg do mundo deve perder o título em breve 6k3t2o

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Novas imagens de satélite mostram que o maior iceberg do mundo, chamado A-23a, está se despedaçando rapidamente. Depois de dois anos vagando pelo oceano, o gigante de gelo começa a se quebrar em milhares de pedaços. Conforme descrito pela NASA, a cena lembra um céu noturno cheio de estrelas – e pode ser o início do fim de uma jornada de quase quatro décadas.

O iceberg A-23a se desprendeu da plataforma de gelo Filchner, na Antártida, em 1986. Desde então, ele permaneceu praticamente imóvel, preso ao fundo do mar, no sul do Mar de Weddell. Por décadas, ficou como uma sombra congelada da plataforma de onde nasceu. Somente em 2023 ele voltou a se mover de forma significativa.

O iceberg A-23a se desfragmentando em milhares de pedaços no mar, encalhado próximo à Ilha Geórgia do Sul. Crédito: Imagem do Observatório da Terra da NASA por Michala Garrison, usando dados MODIS do NASA EOSDIS LANCE e GIBS / Worldview

Diferentemente da maioria dos icebergs, o A-23a seguiu um caminho incomum. Em vez de entrar no chamado “beco dos icebergs”, rota tradicional que leva os blocos de gelo em direção ao norte do Atlântico Sul, ele começou a girar. Esse movimento, chamado de “coluna de Taylor”, o fez dar 15 voltas entre março e novembro de 2024.

Esse comportamento chamou a atenção de cientistas, como Jan Lieser, do Serviço Meteorológico da Antártida. Em um comunicado, ele afirma que esse giro contínuo tornou o iceberg único nos registros. Mas nada dura (nem gira) para sempre: em novembro, o A-23a saiu do movimento circular. A hipótese é que alguma variação nas correntes o empurrou para fora do redemoinho.

A partir daí, o iceberg acelerou. Em apenas um mês, percorreu cerca de 240 km, o que é considerado uma grande distância nesse tipo de deslocamento. No início deste ano, ele se aproximou da Geórgia do Sul, uma ilha conhecida por abrigar milhares de pinguins e outras espécies.

Últimos dias de movimento circular do iceberg A-23a, em novembro de 2024, antes de se tornar imóvel no mar. Crédito: NASA

Iceberg perde pedaços rapidamente mesmo imóvel 3x5r5e

Ao chegar lá, o iceberg ficou praticamente parado. Especialistas acreditam que ele encalhou numa região rasa do oceano, onde outros icebergs também já ficaram presos no ado. Mesmo imóvel, o A-23a começou a perder pedaços de gelo em ritmo acelerado, principalmente por causa das águas mais quentes da região.

Entre os dias 6 de março e 3 de maio de 2025, o iceberg perdeu mais de 360 km quadrados de gelo – uma área maior que a cidade de Curitiba, no Paraná. Esse derretimento foi confirmado por imagens e dados do Centro Nacional de Gelo dos EUA.

A NASA observou que parte do gelo se soltou em blocos ao longo da borda norte do iceberg, resultado de dias de clima ensolarado. Isso é um sinal de que o A-23a está entrando em sua fase final. Ele ainda tem forma, mas está encolhendo de fora para dentro, pouco a pouco.

Em 16 de maio, ele ainda era considerado o maior iceberg do mundo, mas com apenas 29 km quadrados a mais que seu concorrente direto, o D-15A. Se continuar derretendo nesse ritmo, deve perder o título em breve. O fim do A-23a, segundo a NASA, agora é praticamente certo. 




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