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| Titel |
On-orbit radiometric calibration of SWIR bands of TANSO-FTS onboard GOSAT |
| VerfasserIn |
Y. Yoshida, N. Kikuchi, T. Yokota |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 5, no. 10 ; Nr. 5, no. 10 (2012-10-26), S.2515-2523 |
| Datensatznummer |
250003130
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| Publikation (Nr.) |
 copernicus.org/amt-5-2515-2012.pdf |
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| Zusammenfassung |
| The Greenhouse gases Observing SATellite (GOSAT) was launched on 23 January 2009
to monitor global distributions of carbon dioxide and methane. The
Thermal And Near-infrared Sensor for carbon Observation-Fourier Transform
Spectrometer (TANSO-FTS) onboard GOSAT measures the short-wavelength
infrared (SWIR) spectra. Radiometric accuracy directly influences the
accuracy of the retrieved greenhouse gas concentrations. From a 2.5-yr
retrieval analysis of GOSAT data, we found that the minimum of the
mean-squared value of the residuals (the difference between observed and
fitted spectra) and the radiance adjustment factor (one of the ancillary
parameters to be retrieved with the gas concentrations for adjusting the
radiance level between the bands) changed with time, possibly due to
inaccurate degradation correction. In this study, the radiometric
degradation of TANSO-FTS was evaluated from the on-orbit solar calibration
data and modeled as a function of time and wavenumber for each spectral
band. The radiometric degradation of TANSO-FTS Band 1 (centered at 0.76 μm)
after the launch was found to be about 4 to 6%, varying with
wavenumber, whereas the other two bands (Band 2: 1.6 μm and Band 3:
2.0 μm) showed about 1% degradation and small wavenumber dependency.
When we applied the new degradation model in the retrieval analysis, the
above-mentioned issues disappeared. |
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