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Rápido aumento del siglo XX en el surgimiento costero frente al noroeste de África
H V McGregor1, M Dima, H W Fischer
1DFG Research Center Ocean Margins, University of Bremen, Leobener Strasse, D-28359 Bremen, Germany. mcgregor@uni-bremen.de
Science (New York, N.Y.)
|February 3, 2007
Resumen
El resurgimiento costero frente al noroeste de África se intensificó en el siglo XX, mostrando un enfriamiento sin precedentes. Esta tendencia sugiere que el flujo ascendente puede aumentar con el aumento de las temperaturas globales y el CO2 atmosférico.
Área de la Ciencia:
- Oceanografía La oceanografía es la oceanografía.
- Paleoclimatología Paleoclimatología
Sus antecedentes:
- El margen del noroeste de África presenta importantes zonas costeras de surgencia.
- Las temperaturas de la superficie del mar (SST) están influenciadas por la dinámica de la subida de las aguas.
Objetivo del estudio:
- Reconstruir las variaciones de surgimiento del pasado en la costa noroeste de África.
- Investigar la relación entre el upwelling y las anomalías de temperatura en el hemisferio norte (NHTA).
Principales métodos:
- Se analizaron registros de 2500 años de SST de núcleos de sedimentos marroquíes.
- Datos correlacionados de SST con variaciones climáticas a escala milenaria.
Principales resultados:
- Se observó un enfriamiento anómalo del siglo XX, lo que indica un aumento de las fuentes ascendentes.
- Las SST encontradas variaron inversamente con las NHTA, con condiciones cálidas de la Pequeña Edad de Hielo y frías del Período Cálido Medieval.
- La variabilidad demostrada de la subida de aguas costeras se correlaciona con las NHTA.
Conclusiones:
- La subida de aguas costeras frente al noroeste de África está vinculada a las fluctuaciones de temperatura en el hemisferio norte.
- El calentamiento global futuro y el aumento de CO2 pueden conducir a una mayor intensificación de este sistema ascendente.
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