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Pruebas para el control de NO (x) sobre la formación nocturna de SOA.
A W Rollins1, E C Browne, K-E Min
1Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA.
Science (New York, N.Y.)
|September 8, 2012
Resumen
La formación nocturna de aerosoles orgánicos (OA) en Bakersfield aumenta con los óxidos de nitrógeno (NOx). Se espera que las reducciones en las emisiones de NOx disminuyan las concentraciones de OA en la región.
Área de la Ciencia:
- Química atmosférica La química atmosférica es la química de la atmósfera.
- La ciencia del aerosol es la ciencia del aerosol.
- Ciencias ambientales Ciencias ambientales.
Sus antecedentes:
- Los estudios de laboratorio muestran que los óxidos de nitrógeno (NOx) influyen en la producción de aerosoles orgánicos (OA) atmosféricos a través de varias vías químicas.
- La observación directa de estos efectos de los NOx en el OA ambiental ha sido limitada.
Objetivo del estudio:
- Para investigar el impacto directo de los óxidos de nitrógeno (NOx) en la formación de aerosoles orgánicos ambientales (OA).
- Para cuantificar la contribución de las vías químicas específicas a la producción nocturna de OA.
Principales métodos:
- Las mediciones de los nitratos orgánicos particulados se llevaron a cabo en Bakersfield, California.
- El análisis se centró en la relación entre las concentraciones de NOx y la formación de nitratos orgánicos.
- Investigó los efectos de supresión de las moléculas orgánicas reactivas en la química del radical nitrato (NO3).
Principales resultados:
- Se observó que la formación nocturna de nitrato orgánico aumentaba con las concentraciones de NOx.
- Las altas concentraciones de moléculas orgánicas reactivas suprimieron la formación de nitrato orgánico, lo que indica una química multigeneracional.
- Los nitratos orgánicos representaron aproximadamente un tercio del aumento nocturno de la OA.
Conclusiones:
- La química multigeneracional impulsada por el radical nitrato (NO3), un producto de las emisiones antropogénicas de NOx, es una fuente significativa de OA secundaria nocturna.
- La reducción de las emisiones de NOx en Bakersfield y sus alrededores debería conducir a una disminución de las concentraciones de aerosoles orgánicos.
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