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Oceanografía Química. también conocida como Oceanografía Química. Aumento del nitrógeno antropogénico en el Océano
Il-Nam Kim1, Kitack Lee2, Nicolas Gruber3
1School of Environmental Sciences and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Republic of Korea.
Science (New York, N.Y.)
|November 29, 2014
Resumen
El nitrógeno reactivo de Asia está aumentando los niveles de nitratos en el norte del Océano Pacífico. Esto puede cambiar la región de limitada en nitrógeno a limitada en fosfato, impactando la productividad del océano.
Área de la Ciencia:
- Oceanografía La oceanografía es la oceanografía.
- Ciencias ambientales Ciencias ambientales.
- Química marina La química marina es la química de las aguas marinas.
Sus antecedentes:
- Las emisiones de nitrógeno reactivo antropogénico del noreste de Asia están aumentando.
- Se observa una mayor deposición de nitrógeno en todo el Océano Pacífico Norte (NPO).
- La NPO es históricamente un ecosistema marino limitado por el nitrógeno.
Objetivo del estudio:
- Para cuantificar el aumento de la concentración de nitrato (N) en la parte superior del océano en el NPO.
- Para evaluar la distribución espacial de este aumento de N en relación con el fosfato (P).
- Comprender las implicaciones de cambiar las proporciones de nutrientes para la producción primaria.
Principales métodos:
- Análisis de las concentraciones de nutrientes oceánicos (nitrato y fosfato).
- Evaluación de los patrones de deposición de nitrógeno de fuentes atmosféricas.
- Modelado del impacto de los cambios de nutrientes en los ecosistemas marinos.
Principales resultados:
- Se observó un aumento detectable en la concentración de nitrato en la parte superior del océano en el NPO.
- La tasa de aumento del exceso de nitrógeno en relación con el fosfato fue más alta cerca de Asia (~ 0.24 μmol / kg / año) y disminuyó hacia el este.
- Los resultados se alinean con la distribución de la deposición de nitrógeno atmosférico.
Conclusiones:
- Las emisiones antropogénicas de nitrógeno están alterando el equilibrio de nutrientes en el NPO.
- El aumento de la disponibilidad de nitrógeno puede mejorar la producción primaria en esta región previamente N-limitada.
- Se indica un posible cambio a largo plazo de la limitación del nitrógeno a la limitación del fosfato en el NPO.
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