Can a global model chemical mechanism reproduce NO, NO2, and O3 measurements above a tropical rainforest?

Pike, RC, Lee, JD, Young, PJ, Moller, S, Carver, GD, Yang, X, Misztal, P, Langford, B, Stewart, D, Reeves, CE, Hewitt, CN and Pyle, JA (2009) Can a global model chemical mechanism reproduce NO, NO2, and O3 measurements above a tropical rainforest? Atmospheric Chemistry and Physics Discussions, 9 (6). pp. 27611-27648. ISSN 1680-7375

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A cross-platform field campaign, OP3, was conducted in the state of Sabah in Malaysian Borneo between April and July of 2008. Among the suite of observations recorded, the campaign included measurements of NOx and O3 crucial outputs of any model chemistry mechanism. We describe the measurements of these species made from both the ground site and aircraft. We examine the output from the global model p-TOMCAT at two resolutions for this location during the April campaign period. The models exhibit reasonable ability in capturing the NOx diurnal cycle, but ozone is overestimated. We use a box model containing the same chemical mechanism to explore the weaknesses in the global model and the ability of the simplified global model chemical mechanism to capture the chemistry at the rainforest site. We achieve a good fit to the data for all three species (NO, NO2, and O3), though the model is much more sensitive to changes in the treatment of physical processes than to changes in the chemical mechanism. Indeed, without some parameterization of the nighttime boundary layer-free troposphere mixing, a time dependent box model will not reproduce the observations. The final simulation uses this mixing parameterization for NO and NO2 but not O 3, as determined by the vertical structure of each species, and matches the measurements well.

Item Type: Article
Additional Information: © Author(s) 2010. This work is distributed under the Creative Commons Attribution 3.0 License.
Faculty \ School: Faculty of Science > School of Environmental Sciences
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Depositing User: Rosie Cullington
Date Deposited: 23 Feb 2011 11:11
Last Modified: 17 Mar 2020 15:49

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