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| Titel |
Global Retrievals of CO2 and CH4 from GOSAT |
| VerfasserIn |
H. Boesch, A. Cogan, R. Parker, P. Palmer, L. Feng, A. Fraser |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250060828
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| Zusammenfassung |
| The first observations of greenhouse gases from a dedicated satellite sensor are now available
with the launch of the Japanese Greenhouse gas Observing SATellite (GOSAT) on 23 January
2009. GOSAT provides global measurements of total column CO2 and CH4 from its
shortwave infrared (SWIR) bands which are well suited to improve our knowledge of
greenhouse gas surface fluxes, specifically for regions which are poorly sampled by surface
sites. However, the requirements on precision and accuracy of the retrieved columns are
stringent, representing a major challenge for trace gas retrieval algorithms and potential
biases introduced by spectral interference from atmospheric aerosols and clouds as well as
uncertainties in spectroscopy and instrument calibration need to be minimized and
characterized.
In this presentation we will give an overview over the retrievals of the CO2 and CH4 columns
using an optimal estimation retrieval algorithm and the validation activities against
ground-based column retrievals from the Total Carbon Column Observing Network. We will
also present detailed discussion of the comparison between our global CO2 retrievals from
GOSAT with model calculations from the GEOS-Chem global 3-D transport model to test the
consistency between model and observations and we will show some first results of a surface
flux inversion from the global GOSAT CO2 retrievals using an ensemble Kalman
filter. |
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