N2O mole fraction
ppb
330
325
320
315
310
305
75N
60N
40N
20N
EQ
Latitude
20S
40S
60S
75S
1980
1985
1990
1995
2000
Year
2010
2005
300
310
320
330
ppb
330
ppb
N2O deseasonalized mole fraction
ppb
330
325
320
315
310
305
75N
60N
40N
20N
EQ
Latitude
20S
40S
60S
75S
1980
1985
1990
1995
2000
Year
2010
2005
300
310
320
N2O growth rate
ppb/yr
5
4
3
2
1
0
-1
-2
75N
60N
40N
20N
EQ
Latitude
20S
40S
60S
75S
1980
1985
1990
1995
2000
Year
-0.5
Plate 5.2
2010
2005
0
0.5
1
1.5
2
ppb/yr
Variation of zonally averaged monthly mean N2 O mole fractions (top), deseasonalized long-term trends (middle), and growth
rates (bottom). The zonally averaged mole fractions were calculated for each 30◦ zone. The deseasonalized trends and growth rates were
derived as described in Chapter 2.
－ 25 －