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CO 2 monitoring and modelling across Greater London

CO 2 monitoring and modelling across Greater London. Lester Kwiatkowski. Site characteristics. Urban roadside. Urban background. Rural background. Mean = 279.7 µgm -3. Explanatory factors Diurnal mixing depth cycles Anthropogenic emissions

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CO 2 monitoring and modelling across Greater London

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  1. CO2 monitoring and modelling across Greater London Lester Kwiatkowski

  2. Site characteristics Urban roadside Urban background Rural background

  3. Mean = 279.7µgm-3 • Explanatory factors • Diurnal mixing depth cycles • Anthropogenic emissions • Heat island effects influencing diurnal mixing depth • Biogenic signals? • Any suggestions? Mean = 40.1µgm-3 Mean = 34.2µgm-3 Mean = 425.2ppm Mean = 419ppm Mean = 396.2ppm BRUTAL model predictions…

  4. Deciphering wind speed/direction relationships SP

  5. Street canyon effects 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”

  6. 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)

  7. Thanks

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