Question

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 CO₂ concentration would be around:

Question 16 options:

	1.82 ppm CO2/yr
	2.15 ppm CO2/yr
	2.08 ppm CO2/yr
	2.45 ppm CO2/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 CO₂ concentration would be around:

	1.82 ppm CO2/yr
	2.15 ppm CO2/yr
	2.08 ppm CO2/yr
	2.45 ppm CO2/yr

Answer 1

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