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Respuesta dinámica del Océano Pacífico tropical al forzamiento solar durante el Holoceno temprano
Thomas M Marchitto1, Raimund Muscheler, Joseph D Ortiz
1Department of Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO 80309, USA. tom.marchitto@colorado.edu
Science (New York, N.Y.)
|December 4, 2010
Resumen
Este estudio revela las temperaturas de la superficie del mar del Holoceno frente a Baja California, mostrando el calor temprano relacionado con los ciclos solares y la dinámica de El Niño-Oscilación Sur (ENSO). Estos hallazgos ofrecen información sobre la variabilidad climática pasada y las respuestas oceánicas.
Área de la Ciencia:
- La paleoceanografía es la paleoceanografía.
- Ciencias del clima Ciencias del clima Ciencias del clima
- La geoquímica marina es la geoquímica marina.
Sus antecedentes:
- La Oscilación El Niño-Sur (ENSO) influye significativamente en la variabilidad interanual de la temperatura de la superficie del mar (SST) frente a Baja California.
- Comprender el comportamiento pasado de ENSO y sus impulsores es crucial para predecir los patrones climáticos futuros.
Objetivo del estudio:
- Para reconstruir un registro SST del Holoceno de alta resolución de la costa oeste de Baja California Sur.
- Para investigar la relación entre el pasado SST, la variabilidad solar, y las condiciones ENSO-como.
Principales métodos:
- Se utilizó un proxy de magnesio/calcio (Mg/Ca) de alta resolución para determinar las temperaturas pasadas de la superficie del mar.
- Fluctuaciones correlacionadas de SST con proxies de nucleidos cosmogénicos para la variabilidad solar.
Principales resultados:
- A principios y mediados del Holoceno, las SST eran más frías, alineándose con el enfriamiento del Pacífico ecuatorial oriental y las simulaciones de forzamiento orbital.
- Las fluctuaciones de SST a escala milenaria en el Holoceno temprano se correlacionaron con mínimos solares, lo que sugiere condiciones similares a El Niño.
- Los patrones observados se alinean con los teóricos.
- El termostato dinámico del océano.
- respuesta de ENSO al forzamiento radiativo.
Conclusiones:
- El registro proxy Mg/Ca proporciona valiosos conocimientos sobre la dinámica océano-atmósfera del Holoceno en el Pacífico Norte.
- La variabilidad solar puede haber influido en el comportamiento de ENSO durante el Holoceno temprano.
- Los hallazgos apoyan los modelos teóricos de la respuesta de ENSO a las fuerzas climáticas externas.
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