What more processing is needed to use the data of GFAS analysis surface parameters?

Hello everyone,I downloaded the Wildfire flux of Carbon Dioxide data,I've converted NetCDF to TIFF,but I found that the value of this data is almost zero,A small number of non-zero values are also very small,As shown in the figure,Isn't this the concentration of carbon dioxide emitted by a fire?Can't this data be used directly?What else needs to be done?Can you help me? It is very necessary for my paper.Thank you all!