Geology Reference
In-Depth Information
O
O
2
CH
3
CCH
2
ONO
2
+ HO
2
α
-(nitrooxy)acetone
OO
O
RO
2
NO
3
O
2
CH
3
CHCH
2
ONO
2
CH
3
CCHCH
2
ONO
2
M
NO
3
NO
2
PDDN
CH
3
CHO + HCHO
+ NO
2
M
NO
3
ONO
2
ONO
2
RO
2
NO
3
CH
3
CHCH
2
O
2
O
2
CH
3
CHCH
2
O
NO
2
NPPN
Figure 15 A schematic representation of the chain propagation reactions in the NO
3
radical initiated oxidation of propene
28
Aerosol surface
reactions
Organic nitrates
N
2
O
5
NO
2
Alkenes
O
3
O
3
NO
3
H
2
O
NO
2
Aerosol
losses
RH,
DMS
NO, RO
2
Surface losses
HNO
3
Figure 16 A simplified reaction scheme for night-time chemistry involving the nitrate
radical
27
significant regeneration of NO
x
and production of unsubstituted car-
bonyl products while comparatively they are a minor source of HO
x
.
28
For the less alkyl substituted alkenes, there is a greater yield of HO
x
and
bifunctional organic nitrate products but a lesser regeneration of NO
x
.
Therefore, depending on the mix of hydrocarbons, NO
3
chemistry can
act to either recycle NO
x
, therefore inhibiting the formation of nitrate
