Ms. Akiko Inagoya Profile

Akiko Inagoya

Masters Research Student at Univ of Tokyo

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Proceedings Article | 13 November 2010 Paper

Retrieval of minor constituents from thermal infrared spectra observed by GOSAT TANSO-FTS sensor

Ryoichi Imasu, Yoji Hayashi, Akiko Inagoya, Naoko Saitoh, Kei Shiomi

Proceedings Volume 7857, 785708 (2010) https://doi.org/10.1117/12.870684

KEYWORDS: Carbon dioxide, Sensors, Calibration, Infrared radiation, Thermography, Ozone, Infrared sensors, Satellites, Temperature metrology, Black bodies

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The thermal infrared band of the main sensor of the greenhouse gas observing satellite (GOSAT), the TANSO-FTS, must be calibrated with accuracy higher than 0.3 K in the brightness temperature Tbb for retrieving CO2 concentration with accuracy of 1% in the upper atmosphere. However, that accuracy has not been achieved because of some error sources. One is the systematic bias in the radiance spectrum resulting from effects of radiation emitted from internal optics and multiple scattering of target signals. Another is the polarization effect of the pointing mirror. Both effects can be merged into two parameters, gain and offset, in the two point calibration procedure. They can be tuned by comparing the spectrum with well-calibrated spectra such as those from the AIRS sensor. Based on the corrected radiance spectra, global CO2 concentrations were processed. However, they show peculiar latitudinal distribution implying the existence of temporally variant parameters that can affect the calibration. This bias can be reduced by referring to housekeeping data of the satellite in the calibration procedure. The stratospheric ozone distribution is also analyzed. The sensor demonstrated the difference in the ozone hole feature between spring 2009 and 2010 over the South Pole.

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