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Aumento de la abundancia de nitrógeno en el noroeste del Océano Pacífico debido a la deposición de nitrógeno
Tae-Wook Kim1, Kitack Lee, Raymond G Najjar
1School of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang, 790-784, Korea.
Science (New York, N.Y.)
|September 24, 2011
Resumen
La contaminación por nitrógeno de la deposición atmosférica ha aumentado el nitrógeno (N) sobre el fósforo (P) en el noroeste del Pacífico. Este cambio ha cambiado los ecosistemas marinos de limitados en nitrógeno a limitados en fósforo.
Área de la Ciencia:
- Química marina La química marina es la química de los océanos.
- Oceanografía La oceanografía es la oceanografía.
- Ciencias ambientales Ciencias ambientales.
Sus antecedentes:
- Desde 1980, los mares marginales del noroeste del Océano Pacífico muestran una mayor abundancia relativa de nitrato (N) sobre el fósforo (P).
- Esta región está aguas abajo del continente asiático industrializado, lo que sugiere influencias antropogénicas.
Objetivo del estudio:
- Investigar los impulsores del aumento de la disponibilidad de nitrógeno en los mares marginales del noroeste del Pacífico.
- Determinar el impacto de las proporciones cambiantes de nutrientes en la limitación del ecosistema marino.
Principales métodos:
- Análisis de los datos históricos sobre las concentraciones de nutrientes (nitrato y fósforo) en el agua de mar.
- Análisis de correlación entre las estimaciones de deposición de nitrógeno atmosférico y las concentraciones de nitrógeno observadas.
- Evaluación del aporte de nitrógeno fluvial en áreas específicas.
Principales resultados:
- Se ha observado un aumento significativo de N sobre P desde 1980.
- La deposición de nitrógeno atmosférico se identifica como un factor principal del aumento de la disponibilidad de N, mostrando una alta correlación temporal (r = 0,74 a 0,88).
- El aporte de nitrógeno fluvial también es un factor significativo en algunas áreas, contribuyendo al cambio.
Conclusiones:
- El aumento de la disponibilidad de nitrógeno, principalmente de la deposición atmosférica y la entrada fluvial, ha alterado la estequiometría de nutrientes en los mares marginales del noroeste del Pacífico.
- Grandes áreas han pasado de ser ecosistemas limitados por nitrógeno a ecosistemas limitados por fósforo.
- Estos cambios tienen implicaciones significativas para los ciclos biogeoquímicos marinos y el funcionamiento de los ecosistemas.
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