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Impacto de la Circumpolaridad Antártica El desarrollo actual en la estructura oceánica del Paleógeno tardío
Miriam E Katz1, Benjamin S Cramer, J R Toggweiler
1Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, NY 12180, USA. katzm@rpi.edu
Science (New York, N.Y.)
|May 28, 2011
Resumen
La Corriente Circumpolar Antártica (ACC) se desarrolló durante el Oligoceno temprano, estableciendo una estructura oceánica de cuatro capas. Este evento de enfriamiento global reorganizó la circulación del océano profundo y las masas de agua.
Área de la Ciencia:
- La paleoceanografía es la paleoceanografía.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
- Oceanografía La oceanografía es la oceanografía.
Sus antecedentes:
- El enfriamiento global y la glaciación antártica ocurrieron desde el Eoceno medio tardío hasta el Oligoceno temprano.
- La reorganización de las profundidades oceánicas estaba vinculada al desarrollo gradual de la Corriente Circumpolar Antártica (ACC).
Objetivo del estudio:
- Para investigar el desarrollo de la estructura de cuatro capas del océano.
- Comprender el impacto de la Corriente Circumpolar Antártica (ACC) en la circulación oceánica.
Principales métodos:
- Análisis bentónico de isótopos estables de foraminiferos.
- Comparación de datos del isótopo de carbono (δ(13) C) de aguas de mediana profundidad y aguas profundas en el Atlántico Norte occidental.
Principales resultados:
- En el Oligoceno temprano surgió una significativa compensación de δ(13) C entre las aguas del Atlántico Norte de mediana profundidad y profundidad.
- Desarrollo de mínimos de isótopos de oxígeno y carbono de profundidad intermedia vinculados al Agua Intermedia Antártica.
- Las aguas más frías se restringieron al sur del ACC, formando una capa oceánica de fondo distinta.
Conclusiones:
- La moderna estructura oceánica de cuatro capas (aguas superficiales, intermedias, profundas y de fondo) se originó durante el Oligoceno temprano.
- La Corriente Circumpolar Antártica (ACC) fue el principal impulsor de esta reorganización oceanográfica.
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