The influence of cloud chemistry on HOx and NOx in the moderately polluted marine boundary layer: a 1-D modelling study
Item
Title (Dublin Core)
The influence of cloud chemistry on HOx and NOx in the moderately polluted marine boundary layer: a 1-D modelling study
Description (Dublin Core)
A 1-D marine stratocumulus cloud model has been supplemented with a comprehensive and up-to-date aqueous phase chemical mechanism for the purpose of assessing the impact that the presence of clouds has on gas phaseHO<sub>x</sub>, NO<sub>x</sub> and O<sub>3</sub> budgets in the marine boundary layer. The simulations presented here indicate that cloud may act as a heterogeneous source of HONO<sub>g</sub>. The conversion of HNO<sub>4(g)</sub> at moderate pH (~ 4.5) is responsible for this, and, to a lesser extent, the photolysis of nitrate (NO<sub>3</sub><sup>-</sup>). The effect of introducing deliquescent aerosol on the simulated increase of HONO<sub>g</sub> is negligible. The most important consequences of this elevation in HONO<sub>g</sub> are that, in the presence of cloud, gas phase concentrations of NO<sub>x</sub> species increase by a factor of 2, which minimises the simulated decrease in O<sub>3(g)</sub>, and results in a regeneration of OH<sub>g</sub>. This partly compensates for the removal of OH<sub>g</sub> by direct phase transfer into the cloud and may have important implications regarding the oxidising capacity of the marine boundary layer.
Creator (Dublin Core)
Williams, J. E.
Dentener, F. J.
Berg, A. R.
Date (Dublin Core)
2018-06-29
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-2-39-2002
https://acp.copernicus.org/articles/2/39/2002/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
