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| Titel |
CAM-chem: description and evaluation of interactive atmospheric chemistry in the Community Earth System Model |
| VerfasserIn |
J.-F. Lamarque, L. K. Emmons, P. G. Hess, D. E. Kinnison, S. Tilmes, F. Vitt, C. L. Heald, E. A. Holland, P. H. Lauritzen, J. Neu, J. J. Orlando, P. J. Rasch, G. K. Tyndall |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 5, no. 2 ; Nr. 5, no. 2 (2012-03-27), S.369-411 |
| Datensatznummer |
250002448
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| Publikation (Nr.) |
 copernicus.org/gmd-5-369-2012.pdf |
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| Zusammenfassung |
| We discuss and evaluate the representation of atmospheric chemistry in the
global Community Atmosphere Model (CAM) version 4, the atmospheric component
of the Community Earth System Model (CESM). We present a variety of
configurations for the representation of tropospheric and stratospheric
chemistry, wet removal, and online and offline meteorology. Results from
simulations illustrating these configurations are compared with surface,
aircraft and satellite observations. Major biases include a negative
bias in the high-latitude CO distribution, a positive bias in
upper-tropospheric/lower-stratospheric ozone, and a positive bias in summertime
surface ozone (over the United States and Europe).
The tropospheric net chemical ozone production varies significantly between configurations,
partly related to variations in stratosphere-troposphere exchange.
Aerosol optical depth tends to be underestimated over most regions, while comparison with
aerosol surface measurements over the United States indicate reasonable results for sulfate , especially
in the online simulation. Other aerosol species exhibit significant biases.
Overall, the model-data comparison indicates that the
offline simulation driven by GEOS5 meteorological analyses provides the
best simulation, possibly due in part to the increased vertical resolution (52 levels
instead of 26 for online dynamics).
The CAM-chem code as described in this paper, along with
all the necessary datasets needed to perform the simulations described here,
are available for download at www.cesm.ucar.edu. |
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