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Notícias | Comunitária 87.9 FM
Início Notícias Aerossóis do vulcão de Tonga colorem o céu do Sul do Brasil Voltar

Aerossóis do vulcão de Tonga colorem o céu do Sul do Brasil

Aerossóis do vulcão de Tonga colorem o céu do Sul do Brasil

Há vários dias a coloração do céu vem chamando a atenção dos brasileiros ao amanhecer e no fim da tarde. Inicialmente, as imagens do céu cor de rosa ou muito alaranjado ou vermelho vieram de vários estados da Região Sudeste. Nesta semana, o céu tem dado espetáculo no nascer do sol e no ocaso também em estados do Sul do país. A razão é a erupção maciça de um vulcão submarino em Tonga, no Pacífico Sul, na metade de janeiro.

O aspecto do céu muito avermelhado, rosa e laranja decorre de material particulado e aerossóis liberados pela erupção na atmosfera superior. A cinza fina ejetada por uma erupção vulcânica na estratosfera pode ser transportada pelos ventos para todo o mundo.

O dióxido de enxofre expelido reage na atmosfera para formar aerossóis de sulfato (aerossóis são partículas minúsculas suspensas no ar). Tanto as cinzas quanto os aerossóis podem espalhar os raios do sol, dando ao nascer e ao pôr do sol as cores mais vibrantes que se têm observado.

Partículas no ar normalmente espalham a luz solar recebida e é por isso que o céu é azul durante o dia. Quando o Sol se põe ou nasce, os raios atingem as camadas superiores da atmosfera e os comprimentos de onda são divididos e refletidos em vez de serem absorvidos.

As cores muito vibrantes do céu em razão da erupção do vulcão Hunga Tonga-Hunga Ha'apai aparecem ontem e hoje em muitas cidades do Rio Grande do Sul, Santa Catarina e do Paraná, encantando quem atentou para o céu ao amanhecer e principalmente no fim da tarde. Em Porto Alegre, o efeito foi muito visível a partir desta terça com o céu claro no fim da tarde e sem as nuvens da véspera.





Autor: Rádio Comunidade

Data da Postagem: 02/02/2022 16:15:00

Fonte: MetSul Meteorologia /Foto: Carlos Miguel Benedetti/ClicRDC