Impact of Siberian observations on the optimization of surface CO 2 flux

摘要: Abstract. To investigate the effect of additional CO2 observations in Siberia region on Asian and global surface flux analyses, two experiments using different observation data sets were performed for 2000–2009. One experiment was conducted a set that includes Siberian tower measurements (Japan-Russia Tall Tower Inland Observation Network: JR-STATION), other without above observations. The results show balance sources sinks fluxes maintained both with While magnitude optimized uptake uncertainty decreased from −1.17 ± 0.93 to −0.77 ± 0.70 Pg C yr−1, regions (e.g., Europe) Northern Hemisphere (NH) land increased observations, which affect longitudinal distribution total NH sinks. This change mostly caused by changes magnitudes June July. impact measured reduction self-sensitivity tests shows provide useful information estimated flux. average conifer forest Eurasian boreal (EB) is 29.1 % self-sensitivities at JR-STATION sites are approximately 60 % larger than those towers North America. It expected play an important role estimating future.