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| Titel |
Simulated retrievals of methane total columns in support of future satellite missions: an error sources analysis |
| VerfasserIn |
Ramiro Checa-Garcia, Frans Alkemade, Vincent Boudon, Constanze Fischerkeller, Philipp Hahne, Ha Tran, Jochen Landgraf, André Butz |
| 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 |
250098077
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| Publikation (Nr.) |
 EGU/EGU2014-13718.pdf |
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| Zusammenfassung |
| Measuring atmospheric composition is a central objective for monitoring climate change and
understanding human impact on the environment. In particular, quantifying natural and
anthropogenic sources and sinks of greenhouse gases is a primary target of future Earth
observing satellite missions. To this end, upcoming satellites are designed to measure carbon
dioxide and/or methane total columns with high accuracy.
Here, our research focuses on investigating and quantifying the main error sources of
methane total column retrievals from satellites collecting solar backscatter absorption spectra
in the shortwave infrared spectral range. Since errors as small as fractions of a
percent can jeopardize the concentration estimates, our study in particular aims
at supporting the best selection of instrument properties of new sensors such as
Sentinel-5.
To achieve this goal we performed retrieval simulations for a detailed ensemble of
synthetic scenarios covering typical geophysical scenes that any future satellite would
encounter. The ensemble is based on a range of microphysical aerosol and cirrus properties,
Lambertian surface reflection properties and seasonal variations. The use of synthetic
scenarios provides insight into the partitioning of several error sources such as forward model
approximations, instrument properties, imperfect spectroscopy. Finally, our assessment will
point out the most critical aspects to be considered in the design of future satellite missions
and their support studies. |
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