If the total emission rate of carbon in the atmosphere is 13 GtC/yr, and assuming an airborne fraction of 0.34, then the rate of change in CO_{2} concentration would be around:
Question 16 options:

1.82 ppm CO_{2}/yr 

2.15 ppm CO_{2}/yr 

2.08 ppm CO_{2}/yr 

2.45 ppm CO_{2}/yr 
If the total emission rate of carbon in the atmosphere is 13 GtC/yr, and assuming an airborne fraction of 0.34, then the rate of change in CO_{2} concentration would be around:

1.82 ppm CO_{2}/yr 

2.15 ppm CO_{2}/yr 

2.08 ppm CO_{2}/yr 

2.45 ppm CO_{2}/yr 
As we know that airbone fraction is the ratio of annual increase rate in atmospheric carbon dioxide gas to the total emmision rate of Carbon in the atmosphere.
Airbone fraction AF = annual increase rate of CO2/total emmision rate of Carbon in the atmosphere
Given A. F = 0.34
Total emmision rate of carbon in the atmosphere = 13GtC/year
GtC unit = giga tonn Carbon
1 ppm by volume of atmospheric CO2 = 2.13 GtC it is standard unit for carbon.
By formula ,
A. F = rate of change in CO2 concentration /13
0.34*13 = rate of change in CO2 concentration
Rate of change in CO2 concentration = 4.42 GtC/year
= 4.42 GtC/year * (1ppmCO2/2.13GtC) = 2.08 ppmCO2 /year
rate of Change in atmospheric CO2 concentration = 2.08 ppm CO2/year
ans :C) 2.08 ppm CO2/yr
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