© Imperial College LondonPage 1 Simulation of London air quality during June 2006 and the effects...

© Imperial College London

Simulation of London air quality during June 2006 and

the effects of emission control scenarios

Andrea Fraser NCAS funded PhD student

Supervised by Prof. H ApSimon Prof. R Derwent


June - July 2006

A number of Air Quality events reported on the London air quality network (LAQN) website

6th-9th June Ozone 17th-18th June Ozone SO2 PM10

3rd July Ozone SO2 (incidents since 28th June)

12th-17th July Ozone SO2

25th-26th July Widespread Ozone PM NO2 SO2


Meteorology and Emissions Pre-Processing

Meteorology

Using the UK Met. Office UM data (BADC archive) processed with UM-MCIP to create CMAQ ready files

1st June to 8th July

Emissions

Processed by applying temporal factors to EMEP and NAEI (2003) emissions inventories.Natural emissions based on Biogenic Potential inventory (BPI) on EMEP grid. (Dore, Hayman et al 2003)


CMAQ

CMAQ v 4.5.1

Chemistry Carbon Bond IV with aqueous and aerosol chemistry

Solver Rosenbrock

3 nested grids


CMAQ Grid A1 Europe48 x 48km resolution, 24 layers Uses UM Global Meteorology at 3hr time steps

Emissions based on EMEP (2003)

Natural emissions based on Biogenic Potential inventory (BPI) on EMEP grid

NO emissions


CMAQ Grid A2 12 x 12km resolution, 24 layers Uses UM Mesoscale Meteorology at 1hr time steps (approx. 12 x 12km)

Europe emissions based on EMEP (2003) and natural emissions based on BPIUK emissions based on NAEI(2003)

NO emissions


CMAQ Grid A3 4 x 4km resolution, 24 layers Uses UM Mesoscale Meteorology at 1hr time steps (approx. 12x12km)

Europe emissions based on EMEP (2003) and natural emissions based on BPIUK emissions based on NAEI(2003)

NO emissions


Evaluate Model vs. Observed Ozone AURN Rural site

Lullington Heath

0.00

20.00

40.00

60.00

80.00

100.00

02/06/0600:00

04/06/0600:00

06/06/0600:00

08/06/0600:00

10/06/0600:00

12/06/0600:00

14/06/0600:00

16/06/0600:00

18/06/0600:00

Time

Ozo

ne

pp

b

LH Ob LH A1

LH A2 LH A3


AURN Urban sites

Bexley

0.0010.0020.0030.0040.0050.0060.0070.0080.0090.00

02/06/0600:00

04/06/0600:00

06/06/0600:00

08/06/0600:00

10/06/0600:00

12/06/0600:00

14/06/0600:00

16/06/0600:00

18/06/0600:00

Time

Ozo

ne

pp

b

BX Ob BX A1

BX A2 BX A3


Model – Observations in London

32 Sites

Units ppb


Model –Observations

in London

Time of dayAll sites

Units ppb


Effect of NOx and VOC emissions reductions on Ozone

NOx reductions

base case – 30% less NOx

Anthropogenic VOC reductionbase case – 30% less VOC

NOx and Anthropogenic VOC reduction

base case – 30% less VOC and NOx


NOx sensitivity


VOC sensitivity


NOx sensitivity VOC sensitivity


Evaluate NOx sensitivity Brute force O3/NOy indicator


Evaluate VOC sensitivity Brute force H2O2/HNO3indicator


NOx sensitivity NOx-VOC sensitivity


Difference in NOx and NOx-VOC sensitivity


Acknowledgements

• UM-MCIP – developed by G Taylor (Aeolus) funded by UWERN

• BADC data extraction procedure – Chang Wang

• EMEP2CMAQ – Armin Aulinger GKSS

• Biogenic Potential Inventory – Garry Hayman


Ongoing work

• Process data to include the full 6 weeks.

• Compare CMAQ performance on different days and at different locations

• Evaluate CMAQ using Process analysis


NOx sensitivity VOC sensitivity


Ozone Model-Observations in London

32 sites

Units ppb


Model –Observations

in London

Suburban

Urban background

Road side

Site Category

Urban background

12 sites

Suburban 4 sites

Roadside 5 sites

Units ppb

© Imperial College LondonPage 1 Simulation of London air quality during June 2006 and the effects...

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