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| Titel |
Sensitivity Analysis for CO2 Retrieval using GOSAT-2 FTS-2 Simulator |
| VerfasserIn |
Akihide Kamei, Yukio Yoshida, Eric Dupuy, Yasuhiro Yokota, Kaduo Hiraki, Tsuneo Matsunaga |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250108964
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| Publikation (Nr.) |
 EGU/EGU2015-8808.pdf |
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| Zusammenfassung |
| The Greenhouse Gases Observing Satellite (GOSAT), launched in 2009, is the world’s first
satellite dedicated to global greenhouse gases observation. GOSAT-2, the successor
mission to GOSAT, is scheduled for launch in early 2018. The Fourier Transform
Spectrometer-2 (FTS-2) is the primary sensor onboard GOSAT-2. It observes infrared light
reflected and emitted from the Earth’s surface and atmosphere. The FTS-2 obtains high
resolution spectra using three bands in the near to short-wavelength infrared (SWIR)
region and two bands in the thermal infrared (TIR) region. Column amounts and
vertical profiles of carbon dioxide (CO2) and methane (CH4) are retrieved from the
radiance spectra obtained with the SWIR and TIR bands, respectively. Further,
compared to the FTS onboard the GOSAT, the FTS-2 has several improvements: 1)
added spectral coverage in the SWIR region for carbon monoxide (CO) retrieval, 2)
increased signal-to-noise ratio (SNR) for all bands, 3) extended range of along-track
pointing angles for sunglint observations, 4) intelligent pointing to avoid cloud
contamination.
Since 2012, we have been developing a simulator software to simulate the spectral
radiance data that will be acquired by the GOSAT-2 FTS-2. The purpose of the GOSAT-2
FTS-2 simulator is to analyze/optimize data with respect to the sensor specification, the
parameters for Level 1 processing, and the improvement of the Level 2 algorithms. The
GOSAT-2 FTS-2 simulator includes the six components: 1) overall control, 2) sensor carrying
platform, 3) spectral radiance calculation, 4) Fourier Transform module, 5) Level 1B (L1B)
processing, and 6) L1B data output. It has been installed on the GOSAT Research
Computation Facility (GOSAT RCF), which is a high-performance and energy-efficient
supercomputer. More realistic and faster simulations have been made possible by the
improvement of the details of sensor characteristics, the sophistication of the data
processing and algorithms, the addition of the various observing modes including
calibration observation, the use of surface and atmospheric ancillary data for radiative
transfer calculation, and the speed-up and parallelization of the radiative transfer
code.
We will summarize the current status and the future plans in the development of the
GOSAT-2 FTS-2 simulator. We will also demonstrate the reproduction of GOSAT FTS L1B
data and present the sensitivity analysis relating to the engineering parameters, the aerosols
and clouds, and so on, on the Level 1 processing for CO2 retrieval using latest version of the
GOSAT-2 FTS-2 simulator. |
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