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Desoxigenación del océano a gran escala durante el Máximo Térmico Paleoceno-Eoceno
Weiqi Yao1, Adina Paytan2, Ulrich G Wortmann3
1Department of Earth Sciences, University of Toronto, Toronto, Ontario, M5S 3B1, Canada. weiqi.yao@mail.utoronto.ca.
Science (New York, N.Y.)
|July 21, 2018
Resumen
El calentamiento global puede causar la desoxigenación del océano, haciendo que los ecosistemas de las profundidades del océano sean inhabitables. El estudio del Máximo Térmico Paleoceno-Eoceno (PETM, por sus siglas en inglés) muestra condiciones sulfúricas que afectan a las especies marinas y a la pesca.
Área de la Ciencia:
- Paleoceanografía
- Biología marina
- Ciencias del clima
Sus antecedentes:
- El impacto del calentamiento global en las pesquerías sigue sin estar claro.
- Los registros geológicos relacionan los cambios en el ciclo del carbono con la desoxigenación del océano.
- El Máximo Térmico Paleoceno-Eoceno (PETM) proporciona un análogo relevante del cambio climático.
Objetivo del estudio:
- Para investigar la desoxigenación del océano durante el PETM.
- Evaluar el potencial de condiciones de sulfuro generalizadas en las profundidades del océano.
- Comprender las implicaciones para los ecosistemas marinos y la pesca.
Principales métodos:
- Análisis de los datos de isótopos de azufre del PETM.
- Modelado del océano para simular las condiciones ambientales.
Principales resultados:
- Se registró una excursión positiva de isótopos de azufre de 1 por mil durante el PETM.
- El modelado indica que grandes porciones del océano se volvieron sulfúricas.
- La toxicidad del sulfuro de hidrógeno amenaza las zonas mesopelágicas y batipelágicas.
Conclusiones:
- El PETM experimentó una significativa desoxigenación del océano y condiciones sulfúricas.
- Los ecosistemas de las profundidades oceánicas se enfrentan a graves amenazas por la toxicidad del sulfuro de hidrógeno.
- Los escenarios futuros de calentamiento podrían conducir a una pérdida generalizada de hábitat para las especies marinas.
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