Use the 20 year Global Warming Potential (GWP) values in the first Table to calculate an equivalent CO2 emission rate for worldwide greenhouse gas emissions as given in the second table. Assume that total CFCs are divided equally among the three compounds listed. What is the percentage contribution of actual CO2 emissions to the total equivalent CO2? What is the next most important greenhouse gas emission based on this analysis? How do these results compare to those using the 100-year GWP.
Use the 20 year Global Warming Potential (GWP) values in the first Table to calculate an equivalent CO2 emission rate for worldwide greenhouse gas emissions as given in the second table. Assume that total CFCs are divided equally among the three compounds listed. What is the percentage contribution of actual CO2 emissions to the total equivalent CO2? What is the next most important greenhouse gas emission based on this analysis? How do these results compare to those using the 100-year GWP.
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Use the 20 year Global Warming Potential (GWP) values in the first Table to calculate an equivalent CO2 emission rate for worldwide greenhouse gas emissions as given in the second table. Assume that total CFCs are divided equally among the three compounds listed. What is the percentage contribution of actual CO2 emissions to the total equivalent CO2? What is the next most important greenhouse gas emission based on this analysis? How do these results compare to those using the 100-year GWP.
Transcribed Image Text:Table 12.9
Global warming potential of selected greenhouse gases.
Global Warming Potential (Time Horizon)
Atmospheric
Life (Years)
Chemical
Substance
Formula
20 Years
100 Years
500 Years
CO,
CO,
50-200
Methane
CH,
12.2
56
21
6.5
Nitrous oxide
N,O
120
280
310
170
Methylchloroform
CH,CI,
5.4
360
110
35
CFC-11
CFCI,
50
5,000
4,000
1,400
CFC-12
CF,Cl
102
7,900
8,500
4,200
CFC-113
C,F,CI,
85
5,000
5,000
2,300
НCFC-22
CF,HCI
13.3
4,300
1,700
520
HCFC-141b
C,FH,CI,
9.4
1,800
630
200
НСЕC-142b
C,F,H,CI
19.5
4,200
2,000
630
HFC-125
C,HF,
32.6
4,600
2,800
920
HFC-134a
C,H,F,
14.6
3,400
1,300
420
HFC-152a
C,H,F;
CF
SF
1.5
460
140
42
Perfluoromethane
50,000
4,400
6,500
10,000
Sulfur hexafluoride
3200
16,300
23,900
34,900
The GWP for methane includes indirect effects of tropospheric ozone production and stratospheric water
vapor production.
Source: IPCC, 1996a.
Transcribed Image Text:Table 12.1 Annual emissions of major greenhouse gases
Annual Emissions (Muyr
Greenhouse Gas
World
US.
Carbon dioxide (CO,)
29,800
5.300
Methane (CH,)
375
31
Nitrous oxide (N,O)
5.7
0.5
CFC-11, -12, -113
0.7
0.1
HCFC-22
0.2
0.1
HFCS, PFCs, SF,
n/a
0.034
* MI- millions of metric tons. CO, and all U.S data are for 1996. Other world data are for the early 1990
n/a - not available.
Source: PCC, 1996a: USDOE, 1999, 1997 Marland et al, 1999
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