[AAS06-P04] Analysis of variation in atmospheric CO2 and CO concentrations emitted from biomass burning using GOSAT/TANSO−FTS and MOPITT data
Keywords:biomass burning, GOSAT, carbon dioxide, MOPITT, carbon monoxide
In the latitude region around 10°N over Africa, TANSO-FTS CO2 concentrations at 200-300 hPa were 2 ppm higher than a priori CO2 concentrations taken from NIES-TM05 model [Saeki et al., 2013] from December to February when active biomass burning events occurred frequently. We have compared monthly-averaged CO data from the MOPITT TIR/NIR bands with monthly-averaged detrending CO2 data from the TANSO-FTS TIR band at 200-300 hPa in the northern low latitudes over Africa. The comparison result showed that both TANSO-FTS CO2 and MOPITT CO concentrations became higher at around the same time to each other. The periods of increase in the observed CO2 and CO concentrations were in January-March and in February-April, respectively, which slightly shifted from the periods of increase in their a priori concentrations. The amounts of the observed increase were larger compared to their a priori concentrations. MOPITT CO concentrations were clearly higher in the lower troposphere from December to January and in the upper troposphere from February to March, whereas they did not show any increasing trend. We have also analyzed the backward trajectories of air masses with high CO and CO2 concentrations observed by the GOSAT/TANSO-FTS TIR band and the MOPITT NIR/TIR bands to examine their sources.