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Halógenos de la capa límite en la costa de la Antártida

Alfonso Saiz-Lopez¹, Anoop S Mahajan, Rhian A Salmon

¹School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK.

Science (New York, N.Y.)

|July 21, 2007

Resumen

El yodo antártico y los óxidos de bromo están presentes durante todo el año, lo que afecta el clima. Los niveles más altos jamás registrados de óxido de yodo causan un agotamiento significativo de la capa de ozono y una rápida oxidación de otros compuestos.

Área de la Ciencia:

Química de la atmósfera química de la atmósfera
Ciencias del clima Ciencias del clima Ciencias del clima
Ciencias ambientales Ciencias ambientales.

Sus antecedentes:

Los halógenos influyen significativamente en la capacidad de oxidación troposférica.
Los óxidos de yodo contribuyen a la formación de aerosoles ultrafinos con implicaciones climáticas potenciales.

Objetivo del estudio:

Informar las mediciones durante todo el año de la capa límite de óxido de yodo y óxido de bromo en la Antártida.
Para investigar los ciclos estacionales y las concentraciones de estas especies halógenas.

Principales métodos:

Se llevaron a cabo mediciones continuas de óxido de yodo y óxido de bromo en la Estación Halley, en la Antártida.
La recopilación de datos abarcó todo un año, centrándose en el período iluminado por el sol.

Principales resultados:

Tanto el óxido de yodo como el óxido de bromo se detectaron durante todo el año iluminado por el sol.
Estas especies mostraron patrones estacionales y concentraciones similares.
En primavera, el óxido de yodo alcanzó un máximo de 20 partes por billón, una concentración atmosférica récord.
Los niveles de halógenos observados llevaron a un agotamiento sustancial de la capa de ozono.
Se observó una rápida oxidación de sulfuro de dimetilo y mercurio en la capa límite de la Antártida.

Conclusiones:

Los óxidos de halógeno juegan un papel crucial en la química atmosférica de la Antártida.
Las altas concentraciones observadas tienen implicaciones significativas para los niveles de ozono y la oxidación de gases traza clave.

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