TY - JOUR
T1 - Global concentrations of CO2 and CH4 retrieved from GOSAT
T2 - First preliminary results
AU - Yokota, T.
AU - Yoshida, Y.
AU - Eguchi, N.
AU - Ota, Y.
AU - Tanaka, T.
AU - Watanabe, H.
AU - Maksyutov, S.
N1 - Publisher Copyright:
© 2009, the Meteorological Society of Japan.
PY - 2009
Y1 - 2009
N2 - The Greenhouse Gases Observing Satellite (GOSAT) was launched on January 23, 2009, to monitor global atmospheric levels of CO2 and CH4 from space. GOSAT started initial operation of its instruments after an initial satellite system check. Although the radiant data obtained by the GOSAT instruments are currently in the preliminary stages of calibration and validation, the spectral absorption features of CO2 and CH4 are clearly identifiable. An initial retrieval of these gaseous concentrations was performed for measurement scenes of cloud-free conditions over land. These results showed that column-averaged dry air mole fractions of both CO2 and CH4 in the northern hemisphere were higher than those in the southern hemisphere. These latitudinal differences agree with data obtained from groundbased sources and other satellite observations; however, the absolute values of the gaseous concentrations from GOSAT data seem to have been underestimated. Calibrations as well as validation should be conducted to improve the quality of GOSAT retrievals.
AB - The Greenhouse Gases Observing Satellite (GOSAT) was launched on January 23, 2009, to monitor global atmospheric levels of CO2 and CH4 from space. GOSAT started initial operation of its instruments after an initial satellite system check. Although the radiant data obtained by the GOSAT instruments are currently in the preliminary stages of calibration and validation, the spectral absorption features of CO2 and CH4 are clearly identifiable. An initial retrieval of these gaseous concentrations was performed for measurement scenes of cloud-free conditions over land. These results showed that column-averaged dry air mole fractions of both CO2 and CH4 in the northern hemisphere were higher than those in the southern hemisphere. These latitudinal differences agree with data obtained from groundbased sources and other satellite observations; however, the absolute values of the gaseous concentrations from GOSAT data seem to have been underestimated. Calibrations as well as validation should be conducted to improve the quality of GOSAT retrievals.
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U2 - 10.2151/sola.2009-041
DO - 10.2151/sola.2009-041
M3 - Article
AN - SCOPUS:84921521879
SN - 1349-6476
VL - 5
SP - 160
EP - 163
JO - Scientific Online Letters on the Atmosphere
JF - Scientific Online Letters on the Atmosphere
IS - 1
ER -