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| Titel |
The Orbiting Carbon Observatory Glint and Target Modes: Simulations and First Results |
| VerfasserIn |
V. Natraj, H. Bösch, R. J. D. Spurr, Y. L. Yung |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250024706
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| Zusammenfassung |
| The Orbiting Carbon Observatory (OCO) mission was proposed to quantify the sources and
sinks of CO2 by making highly precise measurements of its column abundance. The OCO
spectrometers measure absorption of reflected sunlight at the top of the atmosphere
(TOA) in three narrowband near infrared (NIR) spectral regions. Since OCO flies
over ocean (which is very dark in nadir mode) 70% of the time, the glint mode
(where the specular reflection from ocean surface is measured) is critical. In this
work, we perform simulations of OCO sunglint measurements and then linear error
analysis to assess the sensitivity of the retrievals to forward model assumptions,
particularly with respect to polarization by the ocean wave facets. The errors in
the retrieved column-averaged dry air mole fraction of CO2 (XCO2) using the
OCO Level 2 retrieval algorithm are much lower than the “measurement” noise and
smoothing errors. We also show results from target mode simulations, where the
spacecraft pointing is no longer restricted to the principal plane. Data permitting, we
will also present first results for XCO2 retrievals from actual OCO measurements. |
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