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Can a Global Model Chemical Mechanism Reproduce No, No2, and O3 Measurements Above a Tropical Rainforest? : Volume 9, Issue 6 (21/12/2009)

By Pike, R. C.

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Book Id: WPLBN0003998371
Format Type: PDF Article :
File Size: Pages 38
Reproduction Date: 2015

Title: Can a Global Model Chemical Mechanism Reproduce No, No2, and O3 Measurements Above a Tropical Rainforest? : Volume 9, Issue 6 (21/12/2009)  
Author: Pike, R. C.
Volume: Vol. 9, Issue 6
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Young, P. J., Lee, J. D., Moller, S., Yang, X., Carver, G. D., Pyle, J. A.,...Langford, B. (2009). Can a Global Model Chemical Mechanism Reproduce No, No2, and O3 Measurements Above a Tropical Rainforest? : Volume 9, Issue 6 (21/12/2009). Retrieved from

Description: Centre for Atmospheric Science, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK. 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 O3, as determined by the vertical structure of each species, and matches the measurements well.

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

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