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The Reaction of Sulfur Dioxide Radical Cation with Hydrogen and its Relevance in Solar Geoengineering Models
Author(s) -
Satta Mauro,
Cartoni Antonella,
Catone Daniele,
Castrovilli Mattea Carmen,
Bolognesi Paola,
Zema Nicola,
Avaldi Lorenzo
Publication year - 2020
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.202000194
Subject(s) - chemistry , stratosphere , trace gas , photochemistry , exothermic reaction , sulfur dioxide , reactivity (psychology) , excited state , ionization , chemical reaction , photodissociation , atmospheric chemistry , atmospheric sciences , ion , inorganic chemistry , organic chemistry , atomic physics , physics , ozone , medicine , alternative medicine , pathology
SO 2 has been proposed in solar geoengineering as a precursor of H 2 SO 4 aerosol, a cooling agent active in the stratosphere to contrast climate change. Atmospheric ionization sources can ionize SO 2 into excited states of S O 2 · +, which quickly reacts with trace gases in the stratosphere. In this work we explore the reaction ofH 2D 2with S O 2 · +excited by tunable synchrotron radiation, leading to H S O 2 + + H ( D S O 2 + + D ), where H contributes to O 3 depletion and OH formation. Density Functional Theory and Variational Transition State Theory have been used to investigate the dynamics of the title barrierless and exothermic reaction. The present results suggest that solar geoengineering models should test the reactivity of S O 2 · +with major trace gases in the stratosphere, such as H 2 since this is a relevant channel for the OH formation during the nighttime when there is not OH production by sunlight. OH oxides SO 2 , triggering the chemical reactions leading to H 2 SO 4 aerosol.