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Las señales climáticas superficiales se transmitieron rápidamente al Atlántico Norte profundo durante el último

Wanyi Lu¹, Delia W Oppo¹, Geoffrey Gebbie¹

¹Woods Hole Oceanographic Institution, Woods Hole, MA, USA.

Science (New York, N.Y.)

|November 16, 2023

Resumen

La absorción de calor del océano ha ralentizado el calentamiento de la superficie. Los registros de sedimentos revelan un enfriamiento profundo del océano durante la Pequeña Edad de Hielo, lo que indica que el océano moderó los cambios climáticos pasados.

Área de la Ciencia:

Paleoceanografía
Ciencias del clima
La oceanografía

Sus antecedentes:

Los datos instrumentales muestran el calentamiento del océano bajo la superficie, lo que sugiere una desaceleración en la absorción de calor del océano y su impacto en las temperaturas de la superficie.
Comprender la circulación oceánica pasada y la distribución del calor es crucial para interpretar las tendencias climáticas actuales.

Objetivo del estudio:

Para reconstruir la relación entre la superficie y las temperaturas del océano profundo en los últimos 1200 años utilizando registros de sedimentos de alta resolución.
Comparar los hallazgos paleoceanográficos con las observaciones instrumentales del calentamiento y refrescamiento de los océanos.

Principales métodos:

Análisis de núcleos de sedimentos de alta resolución del Atlántico Norte subpolar.
Reconstrucción de temperaturas oceánicas pasadas y patrones de circulación.

Principales resultados:

Los registros de sedimentos indican un enfriamiento de aproximadamente 0,5 ° C en aguas profundas (por debajo de 1300 m) desde la Anomalía Climática Medieval hasta la Pequeña Edad de Hielo, comenzando alrededor de 1350 CE.
Los registros de superficie muestran un inicio de enfriamiento más asíncrono en un período de 600 años.
Los cambios de temperatura en las profundidades del océano retrasaron los cambios de superficie, consistentes con la rápida transmisión de calor a través de la circulación oceánica.

Conclusiones:

La circulación oceánica, en particular la circulación meridional del océano Atlántico, transmite rápidamente la variabilidad de la superficie al océano profundo.
El océano actuó como un moderador significativo de la temperatura de la superficie de la Tierra durante el último milenio, un papel que continúa desempeñando hoy en día.

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