SOLA
Online ISSN : 1349-6476
Global Concentrations of CO2 and CH4 Retrieved from GOSAT: First Preliminary Results
T. YokotaY. YoshidaN. EguchiY. OtaT. TanakaH. WatanabeS. Maksyutov
Author information
JOURNALS FREE ACCESS

2009 Volume 5 Pages 160-163

Details
Abstract

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 ground-based 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.

Information related to the author
© 2009 by the Meteorological Society of Japan
Previous article Next article
feedback
Top