The current concentration of carbon dioxide in the atmosphere is 408 ppmv. Annua
ID: 1026790 • Letter: T
Question
The current concentration of carbon dioxide in the atmosphere is 408 ppmv. Annual anthropogenic additions to the atmosphere are about 8.3 Gt (as C) of which about 4.9 Gt are removed into the oceans and terrestrial environment. Use these numbers to calculate the yearly net increase in atmospheric carbon dioxide mixing ratio in ppmv.
The below answer was given twice but the values for CO2 are not explained. Please explain EVERY step.
Answer:
Annual anthropogenic addition to atmosphere=8.3 Gt
Annual anthropogenic addition to oceans and terrestrial environment=4.9Gt
Net annual anthropogenic addition to atmosphere=8.3-4.9=3.4 Gt
1 tonne carbon=3.66 CO2 (WHERE DID THIS COME FROM? THIS HAS NO UNITS AND SKIPPED SOME STEPS...)
1Gt CO2 =1/3.66 carbon =0.27 tonnes carbon
3.4×0.27 tonnes=0.918 ppmv (WHY IS THIS VALID FOR THE INCREASE? WHAT IS THE FORMULA USED?)
Net increase=0.918ppmv
Itotal increase=408+0.918 ppmv=408.918ppmv
Explanation / Answer
Answer:
Since, 1 ppmv of CO2= 2.13 Gt (carbon), where Gt=Giga tons
As the current carbon dioxide = 378 ppmv and net addition is 4 Gt(C) (means 1Gt = 0.469 ppmv of carbon dioxide), therefore, total concentration of carbon dioxide in ppmv is equal to 379.877
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