What is TG in CO2?
For the purposes of national greenhouse gas inventories, emissions are expressed as teragrams of CO2 equivalent (Tg CO2 Eq). One teragram is equal to 1012 grams, or one million metric tons.
How much is a Tg of carbon?
CO2 =44/12*carbon because 12 is the molecular weight of carbon and the weight of 2 oxygen molecules is 32. The ratio (12+32)/12 =44/12. What’s a teragram? Tg=1X10 to the 12th grams.
What is Tg C per year?
GtC : gigatonnes of carbon; 1 GtC is equal to 109 tonnes of carbon or 1012 kg. 3.7 Gt carbon dioxide will give 1 GtC. To give you an idea how big this unit is: in 1997 the total supply of petroleum for the USA (including imports) was approximately 1 Gt per year. TgC : teragrams of carbon or 1012 grams of carbon.
How do you calculate CO2 emissions?
Carbon dioxide emissions per therm are determined by converting million British thermal units (mmbtu) to therms, then multiplying the carbon coefficient times the fraction oxidized times the ratio of the molecular weight of carbon dioxide to carbon (44/12). 0.1 mmbtu equals one therm (EIA 2019).
How do you convert CO2e to CO2?
Carbon dioxide equivalent (CO2e) E.g. if 1kg of methane is emitted, this can be expressed as 25kg of CO2e (1kg CH4 * 25 = 25kg CO2e).
How many gigatons of CO2 are in the atmosphere?
As of 2018, CO 2 constitutes about 0.041% by volume of the atmosphere, (equal to 410 ppm) which corresponds to approximately 3210 gigatonnes of CO 2, containing approximately 875 gigatonnes of carbon.
Why do we use CO2e?
“CO2e” is a very useful term for a number of reasons: it allows “bundles” of greenhouse gases to be expressed as a single number; and it allows different bundles of GHGs to be easily compared (in terms of their total global warming impact).
Is GWP the same as CO2e?
GWP is an index, with CO2 having the index value of 1, and the GWP for all other GHGs is the number of times more warming they cause compared to CO2. E.g. 1kg of methane causes 25 times more warming over a 100 year period compared to 1kg of CO2, and so methane as a GWP of 25.
How do you calculate emissions?
The general equation for emission estimation is: E = A x EF x (1-ER/100) where: E = emissions, A = activity rate, EF = emission factor, and ER = overall emission reduction efficiency, %.
How do you calculate carbon intensity?
With total emissions over a given period in CO2e, carbon intensity can then be calculated by dividing emissions by a relevant measure of activity.
How is CO2e emissions calculated?
The most common method is the Tier 1 Calculation Method: GHG emission = 0.001 * Fuel Usage * High heat value *Emission factor. You can get these values from the EPA’s GHG Reporting Program (GHGRP) documentation and your own records.
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