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Unraveling the Unseen Players in the Ocean - A Field Guide to Water Chemistry and Marine Microbiology

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Evidencia de la troposfera del Pacífico para grandes fuentes globales de compuestos orgánicos oxigenados

H Singh¹, Y Chen, A Staudt

¹NASA Ames Research Center, Moffett Field, California 94035, USA. hsingh@mail.arc.nasa.gov

|April 27, 2001

Resumen

Los compuestos orgánicos oxigenados son muy abundantes en el hemisferio sur.

Área de la Ciencia:

Química atmosférica La química atmosférica es la química de la atmósfera.
La composición troposférica de la composición troposférica.

Sus antecedentes:

Los compuestos orgánicos oxigenados influyen en los procesos atmosféricos, incluido el transporte reactivo de nitrógeno, la producción de radicales y la formación de aerosoles.
Existe un conocimiento limitado con respecto a la distribución y las fuentes de estos compuestos, particularmente en el hemisferio sur.

Objetivo del estudio:

Para caracterizar la composición troposférica de las especies orgánicas oxigenadas sobre el Océano Pacífico tropical.
Investigar la abundancia y distribución de compuestos orgánicos oxigenados en el hemisferio sur.

Principales métodos:

Recopilación de datos de encuestas aéreas sobre el Océano Pacífico tropical (30°N a 30°S).
Medición de una docena de sustancias químicas oxigenadas (por ejemplo, carbonilos, alcoholes, nitratos orgánicos, peróxidos) y hidrocarburos C2-C8.

Principales resultados:

Las especies orgánicas oxigenadas se encuentran en abundancias extremadamente altas en la troposfera.
En conjunto, las especies oxigenadas son casi cinco veces más abundantes que los hidrocarburos no metánicos en el hemisferio sur.
Los modelos atmosféricos actuales no pueden simular con precisión estas abundancias observadas.

Conclusiones:

Es probable que existan fuentes significativas y previamente desconocidas de compuestos orgánicos oxigenados.
Las fuentes potenciales incluyen la oxidación atmosférica de hidrocarburos, la degradación fotoquímica oceánica y las emisiones de la vegetación terrestre.
Se necesita más investigación para identificar y cuantificar estas fuentes.

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