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- Title
Assessing temporal clear-sky errors in assimilation of satellite CO<sub>2</sub> etrievals using a global transport model.
- Authors
Corbin, K. D.; Denning, A. S.; Parazoo, N. C.
- Abstract
The Orbiting Carbon Observatory (OCO) and the Greenhouse gases Observing SATellite (GOSAT) will make global observations of the total column dry-air mole fraction of atmospheric CO2 (XCO2 ) starting in 2008. Although satellites have global coverage, XCO2 retrievals will be made only a few times each month over a given location and will only be sampled in clear conditions. Modelers will use XCO2 in atmospheric inversions to estimate carbon sources and sinks; however, if satellite measurements are used to represent temporal averages, modelers may incur temporal sampling errors. We investigate these errors using a global transport model. Temporal sampling errors vary with time and location, exhibit spatially coherent patterns, and are greatest over land and during summer. These errors often exceed 1 ppm and must be addressed in a data assimilation system by correct simulation of synoptic CO2 variations associated with cloud systems.
- Subjects
TELECOMMUNICATION satellites; CARBON dioxide; GREENHOUSE gases; EVAPORATION (Meteorology); ATMOSPHERIC chemistry
- Publication
Atmospheric Chemistry & Physics, 2009, Vol 9, Issue 9, p3043
- ISSN
1680-7316
- Publication type
Article
- DOI
10.5194/acp-9-3043-2009