AbstactIt is needed to accurately evaluate the methane emission from paddy fi elds at a national scale for both scientifi c and political purposes. The existing approaches have shared a common issue with obtaining the realistic information on spatiotemporal variations of crop management. Satellite sensor could possibly detect them, but the methodology to link the satellite observations to the methane emission has not been established. In this study, we enhanced the existing diagnostic satellite-driven paddy ecosystem model, the Biosphere model integrating Eco-physiological And Mechanistic approaches using satellite data for regional Cropland BEAMS-C Sasai et al., 2012 , by integrating the methane processes and examined the potential of this approach by comparing the estimated nation-wide methane emission with that by the existing approaches. The carbon fl ux estimations had good agreements with the measurements at the Mase paddy fl ux site. In regional-scale analyses in Japan, methane emission averaged from 2001 to 2010 was 15.0 gC m -2 year -1 , which was similar to the Tire-1 and -2 results. If we have a continuing improvement of the diagnostic approach, it could be one of the most effi cient tools for estimating the methane fl ux at national scales.
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