CO2 monitoring and modelling across Greater London

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CO2 monitoring and modelling across Greater London
CO2 monitoring and modelling
across Greater London
Lester Kwiatkowski
Site characteristics
Urban roadside
Rural background
Urban background
Mean = 279.7µgm-3
Mean =
40.1µgm-3
Mean = 34.2µgm-3
Mean = 425.2ppm
Explanatory factors
•Diurnal mixing depth
cycles
• Anthropogenic
emissions
• Heat island effects
influencing diurnal
mixing depth
• Biogenic signals?
Mean = 419ppm
Mean = 396.2ppm
• Any suggestions?
BRUTAL model
predictions…
Deciphering wind speed/direction
relationships
SP
Street canyon
effects
Wind Speed m/s
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
0
100
200
300
400
wind direction (degrees)
CO2 signals difficult
to interpret, higher
CO2 for directions
with lower average
wind speeds but
other effects going
on (European CO2
signal)
NOx enrichment
due to easterly
winds carrying
an enriched
“London signal”
Modelling approaches
• Road transport CO2 emissions run through
BRUTAL can explain much of the difference
between NK and MR but fails to account for the
difference between SP and NK/MR
• Stratified modeling work in progress…
(ApSimon & Oxley)
Thanks

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