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Updated: Jun 6, 2025
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A Strain Gauge Monitor SGM for Continuous Valve Gape Measurements in Bivalve Molluscs in Response to Laboratory Induced Diel-cycling Hypoxia and pH
Published on: August 1, 2018
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Oscilaciones decenales en la mayor zona de déficit de oxígeno del océano
N N Duprey1, A D Foreman1, J D Carriquiry2
1Max Planck Institute for Chemistry (Otto Hahn Institute), Mainz, Germany.
Science (New York, N.Y.)
|November 28, 2024
Resumen
El calentamiento de los océanos afecta a las zonas con deficiencia de oxígeno (ODZ). Los isótopos de nitrógeno de coral revelan cambios decenales en la desnitrificación del Pacífico Norte Tropical Oriental, vinculados a la Variabilidad Decenal del Pacífico, no solo a las tendencias de calentamiento global a largo plazo.
Área de la Ciencia:
- Química marina
- Paleoceanografía
- Ciencias del clima
Sus antecedentes:
- Los efectos del calentamiento de los océanos en las zonas con deficiencia de oxígeno (ODZ) no están claros debido a los datos históricos limitados.
- Comprender los cambios pasados en las ZOD es crucial para predecir la desoxigenación futura del océano.
Objetivo del estudio:
- Reconstruir el pasado de la desnitrificación en la ZOD del Pacífico Norte Tropical Oriental (ETNP).
- Investigar la influencia de la variabilidad climática decenal en la dinámica de las ZOD.
Principales métodos:
- Isótopos de nitrógeno ligados al esqueleto de coral utilizados (CS-δ15N) para registros resueltos mensuales.
- Analizó una serie temporal de 80 años de CS-δ15N del ETNP.
Principales resultados:
- Se observaron variaciones significativas decenales en la desnitrificación de ETNP y la deficiencia de oxígeno.
- La desnitrificación alcanzó su punto máximo durante las fases frías de la Variabilidad Decadal del Pacífico.
- Una mayor afluencia durante estas fases probablemente aumentó la productividad y la demanda de oxígeno.
Conclusiones:
- La variabilidad decadal, en particular la variabilidad decadal del Pacífico, influye fuertemente en la dinámica de las ZOD de la ETNP.
- Las evaluaciones previas de las tendencias a largo plazo de las ZOD pueden haber sido sesgadas por las oscilaciones decenales.
- La evolución futura de las ZOD depende de la interacción entre el calentamiento global y los patrones climáticos decenales.
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