About the data of GFAS analysis surface parameters

Hello everyone!

As the title shows,I downloaded the Wildfire flux of Carbon Dioxide data,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 amount of carbon dioxide emitted by a fire?Can't this data be used directly?What else needs to be done?Thank you all!