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El contenido de calor del océano regula el transporte de humedad entre el océano y el continente

Zhimin Jian¹, Yue Wang², Haowen Dang³

¹State Key Laboratory of Marine Geology, Tongji University, Shanghai, China. jian@tongji.edu.cn.

|October 19, 2022

Resumen

El contenido de calor del océano en la piscina cálida del Indo-Pacífico (IPWP) influye en el clima global. Los cambios en la insolación orbital impulsan las variaciones del contenido de calor del océano superior (OHC), amplificando los ciclos hidroclimáticos monzónicos durante 360,000 años.

Área de la Ciencia:

Paleoclimatología
La oceanografía
Dinámica del clima

Sus antecedentes:

La piscina cálida del Indo-Pacífico (IPWP) tiene un impacto significativo en el clima global a través del vapor de agua y la liberación de calor latente.
El contenido de calor del océano superior (OHC) del IPWP está relacionado con el cambio climático moderno, pero sus variaciones a largo plazo y sus efectos sobre el hidroclima son insuficientemente explorados.

Objetivo del estudio:

Investigar las variaciones a largo plazo en el OHC superior del IPWP en los últimos 360.000 años.
Comprender la relación entre el IPWP OHC, la insolación orbital y el clima hidráulico monzónico.
Explorar los mecanismos que amplifican el ciclo hidrológico océano-continente.

Principales métodos:

Proxies geoquímicos combinados y simulaciones de clima transitorio.
El IPWP superior (0-200m) analizó los cambios de la OHC durante 360.000 años.
Utilizó un modelo acoplado aire-mar habilitado por isótopos.

Principales resultados:

Las variaciones OHC superiores de IPWP en los últimos 360,000 años muestran precesión dominante y ciclos de oblicuidad más débiles, correlacionados con gradientes de insolación meridionales.
Sólo el 30%-40% de los aumentos de OHC deglacial se atribuyen a cambios en el volumen de hielo.
Un OHC superior de precesión más alto se correlaciona con el enriquecimiento isotópico de oxígeno de las aguas superficiales IPWP y la precipitación agotada de Asia Oriental.

Conclusiones:

Las variaciones OHC superiores del IPWP, impulsadas por la insolación orbital, amplifican el ciclo hidrológico océano-continente en escalas de tiempo precesionales.
Las variaciones de OHC, en lugar de la temperatura de la superficie, son los principales impulsores de esta amplificación a través de la humedad y la convergencia del calor latente.
El acoplamiento de las variaciones superiores de OHC y monzón, regulado por la insolación, es crítico para la regulación global del hidroclima en escalas de tiempo orbitales.

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