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La posición de la corriente del golfo durante las glaciaciones cuaternarias
Science (New York, N.Y.)
|July 22, 1988
Resumen
Los patrones de circulación oceánica, incluida la Corriente del Golfo, están influenciados por el bombeo Ekman impulsado por el viento. Las capas de hielo continentales de la era glacial alteraron estos patrones de viento, cambiando las temperaturas superficiales del mar del Atlántico Norte.
Área de la Ciencia:
- Oceanografía La oceanografía es la oceanografía.
- Paleoclimatología Paleoclimatología
- Ciencias de la atmósfera Ciencias atmosféricas.
Sus antecedentes:
- Las teorías de la circulación general del océano vinculan los límites de los giros con la línea cero de "bombeo de Ekman".
- La frontera subpolar-subtropical del Atlántico Norte moderno se extiende desde el suroeste al noreste.
- Durante la última edad de hielo, este límite era más zonal, extendiéndose hacia Gibraltar.
Objetivo del estudio:
- Para investigar la influencia de las condiciones de la edad de hielo en la circulación del océano Atlántico Norte.
- Para entender cómo las capas de hielo continentales afectaron los patrones de viento y las temperaturas de la superficie del mar.
Principales métodos:
- Utilizó un modelo numérico de circulación general atmosférica.
- Condiciones atmosféricas simuladas durante la última edad de hielo (hace 18.000 años).
- Analizó el campo de bombeo Ekman resultante y su relación con los límites del paleogenio.
Principales resultados:
- La presencia de una capa de hielo continental de 3 km de espesor modificó significativamente el campo de bombeo de Ekman.
- La línea de bombeo cero de Ekman durante la edad de hielo se superpuso al límite del paleogenio.
- Esta modificación sugiere un vínculo causal entre las capas de hielo, los patrones de viento y los cambios oceanográficos.
Conclusiones:
- Las capas de hielo continentales jugaron un papel crucial en la alteración de los patrones de viento del Atlántico Norte durante las glaciaciones cuaternarias.
- Los cambios en los patrones de viento, impulsados por las capas de hielo, probablemente causaron cambios significativos en las temperaturas superficiales del mar del Atlántico Norte.
- El estudio demuestra un mecanismo por el cual la glaciación impacta la circulación oceánica y el clima.
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