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An Evaluation of the Performance of Chemistry Transport Models, Part 2: Detailed Comparison with Two Selected Campaigns : Volume 4, Issue 6 (08/11/2004)

By Brunner, D.

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Book Id: WPLBN0003997650
Format Type: PDF Article :
File Size: Pages 48
Reproduction Date: 2015

Title: An Evaluation of the Performance of Chemistry Transport Models, Part 2: Detailed Comparison with Two Selected Campaigns : Volume 4, Issue 6 (08/11/2004)  
Author: Brunner, D.
Volume: Vol. 4, Issue 6
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2004
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Rogers, H. L., Köhler, M. O., Brunner, D., Velthoven, P. V., Meijer, E., Staehelin, J.,...Sausen, R. (2004). An Evaluation of the Performance of Chemistry Transport Models, Part 2: Detailed Comparison with Two Selected Campaigns : Volume 4, Issue 6 (08/11/2004). Retrieved from http://www.ebooklibrary.org/


Description
Description: Institute for Atmospheric and Climate Science, ETH, Zürich, Switzerland. This is the second part of a rigorous model evaluation study involving five global Chemistry-Transport and two Chemistry-Climate Models operated by different groups in Europe. Simulated trace gas fields were interpolated to the exact times and positions of the observations to account for the actual weather conditions and hence for the specific histories of the sampled air masses. In this part of the study we focus on a detailed comparison with two selected campaigns, PEM-Tropics A and SONEX, contrasting the clean environment of the tropical Pacific with the more polluted North Atlantic region. The study highlights the different strengths and weaknesses of the models in accurately simulating key processes in the UT/LS region including stratosphere-troposphere-exchange, rapid convective transport, lightning emissions, radical chemistry and ozone production. Model simulated Radon, which was used as an idealized tracer for continental influence, was occasionally much better correlated with measured CO than simulated CO pointing towards deficiencies in the used biomass burning emission fields. The abundance and variability of HOx radicals is in general well represented in the models as inferred directly from the comparison with measured OH and HO2 and indirectly from the comparison with hydrogen peroxide concentrations. Components of the NOy family such as PAN, HNO3 and NO were found to compare less favorably. Interestingly, models showing good agreement with observations in the case of PEM-Tropics A often failed in the case of SONEX and vice versa. A better description of NOx and NOy emissions, chemistry and sinks is thought to be key to future model improvements with respect to the representation of chemistry in the UT/LS region.

Summary
An evaluation of the performance of chemistry transport models, Part 2: detailed comparison with two selected campaigns

 

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