) of monthly mean upper tropospheric CO 2 mixing ratios over the tropics are retrieved from the observations, at 0730 LT (day) and 1930 LT (night) local time, of the meteorological satellite NOAA 10. Analysis of night minus day differences (N-DD) shows large diurnal variations of CO 2 , of the order of 2-3 ppm, during months and over regions affected by biomass burning. The patterns of these diurnal variations are in very good agreement with the diurnal and seasonal variations of biomass burning activity. We …
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