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| Titel |
Lidar reveals CO2 concentration field anomalies in the atmosphere |
| VerfasserIn |
Fabien Gibert, Dimitri Edouart, Claire Cénac, Florian Le Mounier |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250088503
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| Publikation (Nr.) |
 EGU/EGU2014-2608.pdf |
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| Zusammenfassung |
| In the framework of climate prediction, it is necessary to understand the evolution of carbon cycle and particularly biosphere – atmosphere exchanges of carbon dioxide (CO2). The current “top-down” approach relies on a ground-based network of concentration measurements and a transport model with certain space and time resolutions to estimate continental to regional surface fluxes. This method assumes a hypothesis of time and space ergodicity for the in-situ measurements that has not yet been verified. Lidar is able to address the issue of space and time CO2 concentration representativity. In this paper, we present outstanding high space and time resolution measurements of carbon dioxide mixing ratio and radial wind speed in the atmosphere by a new 2-µm high power coherent differential absorption lidar (CDIAL). The lidar reveals CO2 mixing ratio variations in the atmospheric surface layer with 15min time and 100m space resolutions and 1% statistical uncertainty over 1.5 km. The simultaneous radial wind speed measurements enable to understand CO2 gradient anomalies as a result of imperfect mixing of surface anthropogenic emissions. Preliminary advected CO2 anthropogenic fluxes are estimated. Potential applications are discussed in details. |
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