Volcanoes have only recently been recognized as a potentially major source of reactive bromine species to the atmosphere, following from the detection of bromine monoxide (BrO) in the plume emitted by Soufrière Hills Volcano, Montserrat. However, BrO is not expected to be emitted in significant quantity from magma, presenting a puzzle regarding its formation. We report here new field measurements of the tropospheric plume emitted by Mt. Etna, Italy, which provide the first direct evidence of fast oxidation of halogen species in a volcanic plume, and lead to an explanation of how BrO is generated from magmatic HBr emissions. We show that the timescale of BrO formation (a few minutes after emission into the atmosphere) is consistent with rapid heterogeneous halogen chemistry involving sulphate aerosol in the plume. The model highlights considerable complexity to the oxidative chemistry of volcanic plumes

COPPENHEIMER, VI TSANEV, CF BRABAN, RA COX, JW ADAMS, AIUPPA A, et al. (2006). BrO formation in volcanic plumes. GEOCHIMICA ET COSMOCHIMICA ACTA, 70, 2935-2941 [10.1016/j.gca.2006.04.001].

BrO formation in volcanic plumes

AIUPPA, Alessandro;
2006

Abstract

Volcanoes have only recently been recognized as a potentially major source of reactive bromine species to the atmosphere, following from the detection of bromine monoxide (BrO) in the plume emitted by Soufrière Hills Volcano, Montserrat. However, BrO is not expected to be emitted in significant quantity from magma, presenting a puzzle regarding its formation. We report here new field measurements of the tropospheric plume emitted by Mt. Etna, Italy, which provide the first direct evidence of fast oxidation of halogen species in a volcanic plume, and lead to an explanation of how BrO is generated from magmatic HBr emissions. We show that the timescale of BrO formation (a few minutes after emission into the atmosphere) is consistent with rapid heterogeneous halogen chemistry involving sulphate aerosol in the plume. The model highlights considerable complexity to the oxidative chemistry of volcanic plumes
COPPENHEIMER, VI TSANEV, CF BRABAN, RA COX, JW ADAMS, AIUPPA A, et al. (2006). BrO formation in volcanic plumes. GEOCHIMICA ET COSMOCHIMICA ACTA, 70, 2935-2941 [10.1016/j.gca.2006.04.001].
File in questo prodotto:
File Dimensione Formato  
Oppenheimer et al 2006.pdf

non disponibili

Dimensione 479.52 kB
Formato Adobe PDF
479.52 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10447/27831
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 89
  • ???jsp.display-item.citation.isi??? 88
social impact