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| Titel |
Three-dimensional variations of atmospheric CO2: aircraft measurements and multi-transport model simulations |
| VerfasserIn |
Y. Niwa, P. K. Patra, Y. Sawa, T. Machida, H. Matsueda, D. Belikov, T. Maki, M. Ikegami, R. Imasu, S. Maksyutov, T. Oda, M. Satoh, M. Takigawa |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 24 ; Nr. 11, no. 24 (2011-12-22), S.13359-13375 |
| Datensatznummer |
250010307
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| Publikation (Nr.) |
 copernicus.org/acp-11-13359-2011.pdf |
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| Zusammenfassung |
| Numerical simulation and validation of three-dimensional structure of
atmospheric carbon dioxide (CO2) is necessary for quantification of
transport model uncertainty and its role on surface flux estimation by
inverse modeling. Simulations of atmospheric CO2 were performed using
four transport models and two sets of surface fluxes compared with an
aircraft measurement dataset of Comprehensive Observation Network for Trace
gases by AIrLiner (CONTRAIL), covering various latitudes, longitudes, and
heights. Under this transport model intercomparison project, spatiotemporal
variations of CO2 concentration for 2006–2007 were analyzed with a
three-dimensional perspective. Results show that the models reasonably
simulated vertical profiles and seasonal variations not only over northern
latitude areas but also over the tropics and southern latitudes. From
CONTRAIL measurements and model simulations, intrusion of northern CO2
in to the Southern Hemisphere, through the upper troposphere, was confirmed.
Furthermore, models well simulated the vertical propagation of seasonal
variation in the northern free troposphere. However, significant
model-observation discrepancies were found in Asian regions, which are
attributable to uncertainty of the surface CO2 flux data. In summer
season, differences in latitudinal gradients by the fluxes are comparable to
or greater than model-model differences even in the free troposphere. This
result suggests that active summer vertical transport sufficiently
ventilates flux signals up to the free troposphere and the models could use
those for inferring surface CO2 fluxes. |
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