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| Titel |
Boundary layer resolution of CO2 using IR and NIR measurements |
| VerfasserIn |
Damien Lafont, J. Worden, Z. Qu, A. Eldering, K. Bowman, S. Kulawik |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250045138
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| Zusammenfassung |
| Since CO2 concentrations in the boundary layer (BL) are primarily sensitive to surface
fluxes mixing within the BL, closing the global carbon budget is best achieved by
discriminating between CO2 in the BL from CO2 in the free troposphere. Previous studies
shown that adding CO2 laser band increases sensitivity to lower troposphere and that
near IR measurement (NIR) can be used to obtain "column" CO2 measurements
with sufficient precision to obtain CO2 sources and sinks. In this study we used
simulated retrieval approach using IR, NIR and combined radiances. Jointly estimate the
atmospheric temperature, water, surface temperature, emissivity and CO2 using optimal
estimation provided a fully characterization of errors and sensitivity of the estimate
to a simulated "true" CO2 distribution. A linear retrieval is used to examine the
impact of using different spectral bands on a CO2 estimate. The results show that
combined radiance retrieval i.e. using NIR and IR have the potential to resolve the
boundary layer CO2 from free tropospheric CO2 and therefore to increase sensitivity to
surface fluxes and to reduce transport error in inverse estimates of global carbon
budget. |
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