ENAC-SSIE Laboratoire de Pollution de l'Air

ENAC-SSIE Laboratoire de Pollution de l'Air

NOx + VOC O3 NOx + O3 HNO3

1000

- 2

000

m

50 m

mixing height

Sol

Day Night

Mixing Height Variation and

Secondary Pollutant Reservoir


0

10

20

30

40

50

60

70

80

90

100

0 6 12 18 0 6 12 18 0 6 12 18

Heures

O3 [

ppb]

ChaumontJungfraujochPayerne

14.07.9713.07.97 15.07.9714/07/96 21 h UTC

0

200

400

600

800

1000

1200

1400

1600

1800

2000

0 20 40 60 80 100

Ozone [ppb]

Lidar

DOASFine gridCoarse grid

14/07/96 14h UTC

0

200

400

600

800

1000

1200

1400

1600

1800

0 20 40 60 80 100

Ozone [ppb]A

ltit

ud

e a

bo

ve

gro

un

d [

m]

Fine gridCoarse gridLidarDOASAircraft

Alt

itu

de

ab

ov

e g

rou

nd

[m

]

Bern

Lyon

Genève

ZürichChaumont

Payerne Jungfraujoch

WindO3 over the Swiss Plateau

The Regional Scale

Contribution


Slope Wind and

Secondary Pollutant Reservoir

During the day

MILANO

NOx + VOC O3

NOx and VOC O3

During the night

MILANO

NOx + O3 HNO3

NOx and VOC O3


Comparison between Measured and Simulated O3


Milano

Erba

Alpe del vicereTorno

ComoVerzago

Merate

CavenagoBresso

Brera

Varenna

Colico

Magadino

Laveno

Varese

Nibionno

Seregno

Lugano

Milan's Plume200

150

100

500 20 40 60 80 100 120

Bresso

Magadino

Milano

BreraLaveno

Varese

Cavenago

Nibionno

Seregno LuganoComo

Colico Merate

Varenna

Erba

Verzago

Alpe del vicere

Torno

Night level [ppb]

Max

imum

[ppb

]


Milano

Erba

Alpe del vicereTorno

ComoVerzago

Merate

CavenagoBresso

Brera

Varenna

Colico

Magadino

Laveno

Varese

Nibionno

Seregno

Lugano

O3 over MILAN


Abatement Strategies

in Milan


Chemical Regime

Evolution in Milan

High

Low

Low

Ozone Isopeths

Nit

roge

n ox

ides

: NO

x

Hydrocarbons: VOC

VOC limited

NOx limited

optimum


See Breeze and

Primary Pollutants Reservoir

NOx + O3 HNO3

Day

Night

NOx + VOC O3


[km]

[km

]

60

40

20

604020

Thr

ElePen

Spa

Aig

Hel

LioLyk

Mar PerNRo Pat

Dem

Geo LyHRen

PirNSm

Photosmog <90ppb

Photosmog > 90 ppb

Septembre 12: 16h00

Geostrophic Wind

Septembre 14: 16h00

Geostrophic Wind

O3 over ATHENS


Night Day

Total

Day-Night Contributions to the O3 formation

Abatement Strategies

in ATHENS

"Non linear"


Primary polluants maximum in the city

center

Secondary polluants maximum in the city

plume

Background pollution coming from a larger scale

Few km

50 km to 500 km


PP

B

O3

NO2

NO

O3

NONO2

PP

B

City Plume in Los Angeles

City center:

High concentrations of primary

polluants during the morning

City plume:

High concentrations of secondary

polluants during the afternoon

Background:

No daily variation of the pollutant

concentrations


LAG

TACEAC

SAG

AZC

TLA

XAL

MER

PED

CES

PLA

HANUIZ

BJU

TAX

TPN

CHA

0

40

80

120

160

200

240

0 10 20 30 40

O3 night level [ppb]

O3

max

imum

[pp

b]Mexico’s Plume


O3 2nd march 97

Hours

0

50

100

150

200

250

1 3 5 7 9 11 13 15 17 19 21 23

pp

b

PED

PLA

BJU

Hours

pp

b

LAG

MER

UIZ

0

50

100

150

200

250

1 3 5 7 9 11 13 15 17 19 21 23

Hours

pp

b

CES

TPN

TAH

TAX

0

50

100

150

200

250

1 3 5 7 9 11 13 15 17 19 21 23

Hours

pp

b SAG

XAL

HAN

AZC

0

50

100

150

200

250

1 3 5 7 9 11 13 15 17 19 21 23Hours

pp

b

TAC

EAC

TLA

0

50

100

150

200

250

1 3 5 7 9 11 13 15 17 19 21 23


LAG

TAC

EAC

SAG

AZC

TLA

XAL

MER

PED

CES

PLA

HAN

UIZ

BJU

TAX

TPN

TAH

80

160

240

12:00 14:30 17:00

O3 maximum hour

O3

ma

xim

um

[p

pb

]

Mexico’s Plume


11:00 14:00

17:00 20:00

O3 and Wind Simulation on March the 2nd


With nesting Without nesting

Influence of the nesting

2 km resolution

4 km resolution

O3 at 17:00


Contributions to the O3 Formation

March 1st March 2nd

March 1st and 2nd

No emission Mutual interaction

Documents

ENAC-SSIE Laboratoire de Pollution de l'Air