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Título: | On the formation of tropical rings of atomic halogens: Causes and implications |
Autor: | Saiz-Lopez, A. CSIC ORCID; Fernández, Rafael P. CSIC ORCID | Fecha de publicación: | 2016 | Editor: | American Geophysical Union | Citación: | Geophysical Research Letters 43: 2928- 2935 (2016) | Resumen: | Halogens produced by ocean biological and photochemical processes reach the tropical tropopause layer (TTL), where cold temperatures and the prevailing low ozone abundances favor the diurnal photochemical enhancement of halogen atoms. Under these conditions atomic bromine and iodine are modeled to be the dominant inorganic halogen species in the sunlit TTL, surpassing the abundance of the commonly targeted IO and BrO radicals. We suggest that due to the rapid photochemical equilibrium between halogen oxides and halogen atoms a natural atmospheric phenomenon evolves, which we have collectively termed >tropical rings of atomic halogens.> We describe the main causes controlling the modeled appearance and variability of these superposed rings of bare bromine and iodine atoms that circle the tropics following the Sun. Some potential implications for atmospheric oxidizing capacity are also explored. Our model results suggest that if experimentally confirmed, the extent and intensity of the halogen rings would directly respond to changes in oceanic halocarbon emissions, their atmospheric transport, and photochemistry. | URI: | http://hdl.handle.net/10261/142040 | DOI: | 10.1002/2015GL067608 | Identificadores: | doi: 10.1002/2015GL067608 issn: 1944-8007 |
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