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| Titel |
Polarization Effects on Column CO2 Retrievals from GOSAT Measurements |
| VerfasserIn |
Vijay Natraj, Hartmut Boesch, Robert J. D. Spurr, Yuk L. Yung |
| 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 |
250038135
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| Zusammenfassung |
| The Japanese Space Exploration Agency (JAXA) successfully launched the Greenhouse
Gases Observation Satellite (GOSAT), dedicated to the measurement of CO2 columns, in
2009. The objective of GOSAT is to quantify the sources and sinks of CO2 by making highly
precise measurements of its column abundance. GOSAT measures absorption of reflected
sunlight at the top of the atmosphere (TOA) in the short-wave infrared (SWIR) with
spectrometers that are highly sensitive to atmospheric polarization. Consequently, one of the
biggest challenges to accurate retrievals is the consideration of polarization in the modeling
of the atmospheric radiative transfer.
We have developed a fast and accurate two orders of scattering (2OS) model to account
for polarization effects due to the atmosphere and surface. We have shown that the 2OS
model works very well for an Orbiting Carbon Observatory (OCO) like instrument.
In this work, we apply the same model to GOSAT observations to investigate the
impact of signal to noise ratio (SNR) and spectral resolution. GOSAT measures two
orthogonal components of polarization (P and S) and we study the polarization effect on
column CO2 retrievals, comparing results derived separately for each component. |
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