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Aumento deglacial de la variabilidad estacional de la temperatura en el océano tropical
Lars Wörmer1, Jenny Wendt2, Brenna Boehman2,3
1MARUM - Center for Marine Environmental Sciences and Faculty of Geosciences, University of Bremen, Bremen, Germany. lwoermer@marum.de.
Nature
|November 30, 2022
Resumen
La terminación del Younger Dryas no alteró las temperaturas de la superficie del mar atlántico tropical (SST) anualmente. Sin embargo, la estacionalidad oceánica y la variabilidad interanual aumentaron significativamente, lo que afectó el clima en todos los continentes.
Área de la Ciencia:
- Paleoclimatología
- La oceanografía
- Ciencias del clima
Sus antecedentes:
- La transición del Dryas más joven (YD) al Holoceno implicó un abrupto calentamiento del hemisferio norte.
- El impacto de esta transición en las temperaturas oceánicas de baja latitud y la variabilidad climática sigue siendo objeto de debate.
- La variabilidad de la temperatura de la superficie del Atlántico tropical (SST) tiene implicaciones significativas para los patrones climáticos globales.
Objetivo del estudio:
- Para reconstruir la variabilidad del SST del Atlántico tropical durante la transición YD-Holoceno.
- Comprender la influencia del cambio climático abrupto en la dinámica de la temperatura del océano subanual a decenal.
- Evaluar la sensibilidad de las SST tropicales del Atlántico a los cambios climáticos glaciales e interglaciales.
Principales métodos:
- Imágenes espectrométricas de alta resolución (100-μm) de las alquenonas de cadena larga en los sedimentos de la cuenca de Cariaco.
- Análisis de núcleos de sedimentos para reconstruir las temperaturas y la variabilidad de la superficie del mar en el pasado.
- Cuantificación de la estacionalidad de la SST y de la variabilidad interanual.
Principales resultados:
- El promedio anual de SST en el Atlántico tropical se mantuvo estable durante la transición YD-Holoceno.
- La estacionalidad oceánica se duplicó, acercándose a las amplitudes modernas.
- La variabilidad interanual de la SST se intensificó durante el Holoceno temprano.
- Los cambios fueron potencialmente impulsados por cambios en la Zona de Convergencia Intertropical (ZCIT).
Conclusiones:
- La variabilidad del SST en el Atlántico tropical subdecadal es sensible a los cambios bruscos del clima de fondo.
- La transición YD-Holoceno condujo a un aumento de la estacionalidad de la SST y la variabilidad interanual, no a cambios en la media anual.
- Los hallazgos destacan las respuestas regionales complejas a los principales eventos climáticos glaciales e interglaciales.
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