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19 de abril de 2024
pero falta
Advierten que el océano cambiará de color por el calentamiento global jueves 7 de febrero de 2019 07:17
En 2100 más del 50 por ciento de los océanos habrá cambiado de color debido al cambio climático: se intensificarán las regiones azules y verdes, según una investigación del Instituto Tecnológico de Massachusetts (MIT).
El estudio publicado en Nature Communication concluye que el calentamiento global está provocando importantes alteraciones en las poblaciones de fitoplancton, un vegetal acuático, algo que afectará al color de los océanos.
Los resultados prevén que las zonas azules se vuelvan más azules, reflejando el descenso de los niveles de fitoplancton -y de vida en general-, y las verdes aún más verdes, lo que indicaría una proliferación de especies de fitoplancton.
El color del océano depende de cómo los rayos de sol interactúan con los componentes del agua. Las moléculas de agua absorben casi toda la luz solar, excepto la parte azul del espectro, lo que se traduce en que las zonas del océano con menos vida se perciben de un azul intenso.
En cambio, el fitoplancton contiene clorofila, que absorbe más azul y menos verde, por lo que las regiones ricas en algas son de un color verdoso.
Stephanie Dutkiewicz, la directora de investigación del proyecto, prevé que los cambios entre comunidades de fitoplancton podrían alterar las redes alimentarias que sustentan, lo que considera un problema"potencialmente serio".
Sin embargo, admite la dificultad que supone determinar si estos cambios se deben al cambio climático o a la variabilidad natural de la clorofila. "Un evento como El Niño o La Niña provocaría un cambio en la clorofila porque varía la cantidad de nutrientes que llegan al sistema", explica.
(EFE)