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Chlorine-hydrocarbon Photochemistry in the Marine Troposphere and Lower Stratosphere by H. B. Singh; J. F. Kasting is a Earth and Planetary Sciences article available to read on EtoBox.

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A one-dimensional photochemical model was used to explore the role of chlorine atoms in oxidizing methane and other nonmethane hydrocarbons (NMHCs) in the marine troposphere and lower stratosphere. Where appropriate, the model predictions were compared with available measurements. C1 atoms are predicted to be present in the marine troposphere at concentrations of approximately 103 cm -3, mostly as a consequence of the reaction of OH with HCI released from sea spray. Despite this low abundance, our results indicate that 20 to 40% of NMHC oxidation in the troposphere (0-10 km) and 40 to 90% of NMHC oxidation in the lower stratosphere (10-20 km) is caused by CI atoms. At 15 km, NMHC--C1 reactions account for nearly 80% of the PAN produced.The model was also used to test the longstanding hypothesis that NOCI is an intermediate to HCI formation from sea salt aerosols. It was found that the NOC1 concentration required (-10 ppt) would be incompatible with field observations of reactive nitrogen and ozone abundance. Chlorine nitrate (CIONO2) and methyl nitrate (CH3ONO2) were shown to be minor components of the total NO3. abundance. Heterogeneous reactions that might enhance photolysis of h

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Author

H. B. Singh; J. F. Kasting

Publisher

Springer Netherlands; Springer-Verlag; Kluwer Academic Publishers; Springer Science and Business Media LLC (ISSN 0167-7764)

Published

1988

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)