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        Evaluation of operational on-line-coupled regional air quality models over Europe and North America in the context of AQMEII phase 2 : Part I: Ozone

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        1_s2.0_S1352231014007353_main.pdf (PDF, 4Mb)
        Author
        Im, Ulas
        Bianconi, Roberto
        Solazzo, Efisio
        Kioutsioukis, Ioannis
        Badia, Alba
        Balzarini, Alessandra
        Baró, Rocío
        Bellasio, Roberto
        Brunner, Dominik
        Chemel, C.
        Curci, Gabriele
        Flemming, Johannes
        Forkel, Renate
        Giordano, Lea
        Jiménez-Guerrero, Pedro
        Hirtl, Marcus
        Hodzic, Alma
        Honzak, Luka
        Jorba, Oriol
        Knote, Christoph
        Kuenen, Jeroen J.P.
        Makar, Paul A.
        Manders-Groot, Astrid
        Neal, Lucy
        Pérez, Juan L.
        Pirovano, Guido
        Pouliot, George
        San Jose, Roberto
        Savage, Nicholas
        Schroder, Wolfram
        Sokhi, Ranjeet S.
        Syrakov, Dimiter
        Torian, Alfreida
        Tuccella, Paolo
        Werhahn, Johannes
        Wolke, Ralf
        Yahya, Khairunnisa
        Zabkar, Rahela
        Zhang, Yang
        Zhang, Junhua
        Hogrefe, Christian
        Galmarini, Stefano
        Attention
        2299/16281
        Abstract
        The second phase of the Air Quality Model Evaluation International Initiative (AQMEII) brought together sixteen modeling groups from Europe and North America, running eight operational online-coupled air quality models over Europe and North America on common emissions and boundary conditions. With the advent of online-coupled models providing new capability to quantify the effects of feedback processes, the main aim of this study is to compare the response of coupled air quality models to simulate levels of O3 over the two continental regions. The simulated annual, seasonal, continental and sub-regional ozone surface concentrations and vertical profiles for the year 2010 have been evaluated against a large observational database from different measurement networks operating in Europe and North America. Results show a general model underestimation of the annual surface ozone levels over both continents reaching up to 18% over Europe and 22% over North America. The observed temporal variations are successfully reproduced with correlation coefficients larger than 0.8. Results clearly show that the simulated levels highly depend on the meteorological and chemical configurations used in the models, even within the same modeling system. The seasonal and sub-regional analyses show the models' tendency to overestimate surface ozone in all regions during autumn and underestimate in winter. Boundary conditions strongly influence ozone predictions especially during winter and autumn, whereas during summer local production dominates over regional transport. Daily maximum 8-h averaged surface ozone levels below 50–60 μg m−3 are overestimated by all models over both continents while levels over 120–140 μg m−3 are underestimated, suggesting that models have a tendency to severely under-predict high O3 values that are of concern for air quality forecast and control policy applications.
        Publication date
        2015-08
        Published in
        Atmospheric Environment
        Published version
        https://doi.org/10.1016/j.atmosenv.2014.09.042
        Other links
        http://hdl.handle.net/2299/16281
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