ADEOS/OCTSとPOLDERデータの複合利用

1.放射輝度測定誤差がエアロゾル・リトリーバルに与える影響の評価

抄録

Comparison and combination of OCTS and POLDER, which are sister sensors mounted on the satellite ADEOS, are considered from the viewpoint of aerosol retrieval. First it is shown that the latest inflight calibration coefficients for each sensor provide good cross-calibrations between two sensors. Then aerosol characteristics are extracted using the OCTS level-lb data and POLDER level-ldata. From comparison of the retrieved aerosol optical properties, we found that Angstrom exponent is more strongly affected by the fluctuation of radiance than the optical thickness of aerosols is.
Distribution maps showing the Angstrom exponent and the optical thickness of aerosols are compiled from the artificial OCTS data contaminated by random error as well as from OCTS raw data on April 26 in 1997, respectively. From these aerosol maps, it can be seen that :
1) the retrieved optical thickness of aerosols includes the same order of error as the radiance error,
2) the Angstrom exponet suffers a error by ten times larger than the radiance one.
We can say that Angstrom exponent can not avoid the influence of observational error in radiance, however we can also say that polarization degree is promising to improve this point.