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Estructura de densidad y transporte de la Corriente del Golfo durante el último milenio
David C Lund1, Jean Lynch-Stieglitz, William B Curry
1Massachusetts Institute of Technology/Woods Hole Oceanographic Institution Joint Program in Oceanography, Woods Hole, Massachusetts 02543, USA. dlund@gps.caltech.edu
Nature
|December 1, 2006
Resumen
La Corriente del Golfo fluyó más débil durante la Pequeña Edad de Hielo, contribuyendo potencialmente al enfriamiento del Atlántico Norte. Este estudio utilizó núcleos de sedimentos para reconstruir las condiciones oceánicas y climáticas del pasado.
Área de la Ciencia:
- Oceanografía La oceanografía es la oceanografía.
- Paleoclimatología Paleoclimatología
- Ciencias del clima Ciencias del clima Ciencias del clima
Sus antecedentes:
- La Corriente del Golfo es una importante corriente oceánica que transporta calor y agua al Atlántico Norte.
- Comprender la variabilidad a largo plazo de la Corriente del Golfo es crucial para las predicciones del cambio climático.
- Los registros instrumentales son demasiado cortos para capturar las fluctuaciones climáticas de varios siglos.
Objetivo del estudio:
- Para reconstruir el comportamiento pasado de la Corriente del Golfo utilizando archivos geológicos.
- Para investigar el papel de la Corriente del Golfo en eventos climáticos pasados como la Pequeña Edad de Hielo.
- Para evaluar el vínculo entre la circulación del océano Atlántico y el ciclo hidrológico.
Principales métodos:
- Análisis de foraminíferos de núcleos de sedimentos de alta resolución en el estrecho de Florida.
- Reconstrucción del gradiente de densidad de corriente cruzada y el corte vertical de corriente.
- Estimación del transporte de volumen pasado y la salinidad superficial.
Principales resultados:
- La Corriente del Golfo exhibió sistemáticamente un menor gradiente de densidad de corriente cruzada y corte de corriente vertical durante la Pequeña Edad de Hielo (aprox. 1200-1850 d.C.). también conocido como
- Se estima que el volumen de transporte de la Pequeña Edad de Hielo fue aproximadamente un 10% más débil que los valores actuales.
- El caudal reducido coincidió con mínimos de temperatura y una salinidad superficial anormalmente alta, lo que indica un vínculo con el ciclo hidrológico.
Conclusiones:
- La disminución del transporte de calor oceánico por la Corriente del Golfo puede haber contribuido al enfriamiento de la Pequeña Edad de Hielo en el Atlántico Norte.
- El estudio destaca un estrecho vínculo entre la circulación del Océano Atlántico y el ciclo hidrológico durante el último milenio.
- Los datos paleoceanográficos proporcionan información esencial sobre la dinámica climática a largo plazo y el comportamiento actual de los océanos.
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