2 3 4 5 6 7 Supplement
Fig. S1. Simulated zonal mean vertical profiles of N2O mixing ratio (ppb) for DJF (upper
panel) and JJA (lower panel) shown for each model as indicated in the top-left corner.
Superimposed are contours of annual mean potential temperature (K) (white lines) and annual
mean tropopause height (dotted black line).
43 1 Fig. S2. Map showing the observations used in this inter-comparison study.
ALT ZEP
MHD
PFA
BRW
SHM
THD
NWR
HAAKUM
MLO
CHR
ULB
IZO
RPB
ASC
SMO
SEY
RTA
EIC
CGO
TDF
HBA
NOAA CCGG
AGAGE
NOAA aircraft
SPO
2 3 44 Fig. S3. Comparison of the zonal annual mean meridional gradients of N2O (ppb) at the
surface with the modelled/observed global mean mixing ratio subtracted. Shown are the
gradients calculated using the flux scenarios: OCNPIC (top left), OCNN04 (top right),
OCNN95 (bottom left), and BWMN04 (bottom right) with the integrated flux in 10°
latitudinal bands (TgN y-1) from each scenario shown in the bar-plot below. Legend: Mozart4:
yellow, ACTMt42l32: blue, ACTMt42l67: green, TM5: grey-blue, TM3-NCEP: purple,
TM3-ERA: red, LMDZ4: magenta, TOMCAT: dark green, observed: black.
2
2
1
1
N2O [ppb]
N2O [ppb]
1 2 3 4 5 6 7 8 9 0
−1
−2
−90
−60
−30
0
30
60
90
N2O [TgN y−1]
N2O [TgN y−1]
2.0
1.5
1.0
−60
−30
0
30
60
N2O [ppb]
N2O [ppb]
0
−60
−30
0
30
60
90
30
60
90
−60
−30
0
30
60
90
1.5
1.0
Latitude
0
−1
−2
−90
−60
−30
0
30
60
90
−60
−30
0
30
60
90
2.5
N2O [TgN y−1]
2.0
N2O [TgN y−1]
0
1
−1
1.5
1.0
0.5
2.0
1.5
1.0
0.5
−60
−30
0
Latitude
−30
2
1
10 11 12 13 −60
2.0
0.0
−90
90
Latitude
2
0.0
−90
−2
−90
0.5
0.5
−2
−90
−1
2.5
2.5
0.0
−90
0
30
60
90
0.0
−90
Latitude
45 1 2 3 4 Fig. S4. Hovmöller plots of N2O fluxes from the terrestrial biosphere in OCN (BWM had no
seasonal cycle) and from the ocean in PIC, N95 and N04 (from top to bottom). Fluxes are
shown in gN m-2 y-1.
OCN
0.10
0.08
0
Latitude
50
0.12
0.06
−50
0.04
0.02
0.00
2
4
6
8
10
12
PIC
0.10
0.06
0.04
0
Latitude
50
0.08
0.02
0.00
−50
−0.02
−0.04
2
4
6
8
10
12
N95
0.10
0.06
0.04
0
Latitude
50
0.08
0.02
0.00
−50
−0.02
−0.04
2
4
6
8
10
12
N04
0.10
0.06
0.04
0
Latitude
50
0.08
0.02
0.00
−50
−0.02
−0.04
2
5 6 4
6
8
10
12
46