Textor, C. and Schulz, M. and Guibert, S. and Kinne, S. and Balkanski, Y. and Bauer, S. and Berntsen, T. and Berglen, T. and Boucher, O. and Chin, M. and Dentener, F. and Diehl, T. and Feichter, J. and Fillmore, D. and Ginoux, P. and Gong, S. and Grini, A. and Hendricks, J. and Horowitz, L. and Huang, P. and Isaksen, I. S. A. and Iversen, T. and Kloster, S. and Koch, D. and Kirkevåg, A. and Kristjansson, J. E. and Krol, M. and Lauer, A. and Lamarque, J. F. and Liu, X. and Montanaro, V. and Myhre, G. and Penner, J. E. and Pitari, G. and Reddy, S. and Seland, Ø. and Stier, P. and Takemura, T. and Tie, X. (2007) The effect of harmonized emissions on aerosol properties in global models – an AeroCom experiment. Atmospheric Chemistry and Physics Discussions, 7 (1). pp. 1699-1723. ISSN 1680-7367 http://resolver.caltech.edu/CaltechAUTHORS:TEXacpd07
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The effects of unified aerosol sources on global aerosol fields simulated by different models are examined in this paper. We compare results from two AeroCom experiments, one with different (ExpA) and one with unified emissions, injection heights, and particle sizes at the source (ExpB). Surprisingly, harmonization of aerosol sources has only a small impact on the simulated diversity for aerosol burden, and consequently optical properties, as the results are largely controlled by model-specific transport, removal, chemistry (leading to the formation of secondary aerosols) and parameterizations of aerosol microphysics (e.g. the split between deposition pathways) and to a lesser extent on the spatial and temporal distributions of the (precursor) emissions. The burdens of black carbon and especially sea salt become more coherent in ExpB only, because the large ExpA diversity for these two species was caused by few outliers. The experiment also indicated that despite prescribing emission fluxes and size distributions, ambiguities in the implementation in individual models can lead to substantial differences. These results indicate the need for a better understanding of aerosol life cycles at process level (including spatial dispersal and interaction with meteorological parameters) in order to obtain more reliable results from global aerosol simulations. This is particularly important as such model results are used to assess the consequences of specific air pollution abatement strategies.
|Additional Information:||© 2007 Author(s). This work is licensed under a Creative Commons License. Published by Copernicus GmbH on behalf of the European Geosciences Union. Received: 18 December 2006 – Accepted: 19 January – Published: 2 February 2007. This work was supported by the European Projects PHOENICS (Particles of Human Origin Extinguishing “natural” solar radiation In Climate Systems) and CREATE (Construction, use and delivery of an European aerosol database), and the French space agency CNES (Centre National des Etudes Spatiales). The authors would like to thank the Laboratoire des Sciences du Climat et de l’Environnement, Gif-sur-Yvette, France, and the Max-Planck-Institut für Meteorologie, Hamburg, Germany. The work of O. Boucher forms part of the Climate Prediction Programme of the UK Department for the Environment, Food and Rural Affairs (DEFRA) under contract PECD 7/12/37.|
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|Deposited On:||05 Feb 2007|
|Last Modified:||26 Dec 2012 09:31|
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