4th workshop of the excompte modelling exercise chemical aspects:

4th WORKSHOP OF THE EXCOMPTE MODELLING EXERCISE

Chemical ASPECTS:

I- Primary Pollutants (CO, SO2)

II- Ozone Precursors (NO2)

III- Ozone

IV- Ozone production (OH, chemical indicators)

V- Processes (Photolysis, deposition rates)

I-1. Primary pollutants : CO

- Differences on the initial conditions => large differences on the background values from below 25 ppb (Polair), to 25-50 ppb (Mocage, RAMS-CAMx, TCAM1) up to 150-200 ppb for the others simulations

- Temporal evolution: impact of the evolution of the height of the surface layer- High concentrations inside plumes from sources at night- 09htu : slight decrease (whereas emissions increase slighly)- 12htu : decrease of the concentration- 15htu : CO plumes limited to the main sources emissions along the coast- 18htu : concentrations and plumes increase (whereas emissions decrease slightly)

- Warning: Even if models use normally the same inventory, it seems that the integration of this inventory was done on the same wayd, and differences others than

due to the spatial resolution appears

Use of the same meteorological forcing:- Night up to Morning: CHIMERE2 and RAMS-CAMX2 tend to the

MOCAGE1 simulation- From mid-day: influence is less strong

Differences between models:- UAM-Total and Polair: fine and intense plumes close to the sources- UAM-Total: mean co values at the north-west and some peaks near Arles- MOCAGE2 close to MOCAGE1- AZUR close to CHIMERE1- RAMS-RACM close to RAMS-MOCA2- Plumes are frequently puffs in the MOCAGE1 simulations

Differences between models:- frequently CO plumes above sea are intense in MC2-AQ simulations- frequently CO plumes above sea are not intense in MESO-NHC simulations- MM5b differ to the most to the mean simulated patterns (for days when wind fields differ to the mean meteorological forcing)

- Many times: strong relation between the localisation of the CO plumes and the wind-field

Few stations available to compare models and measurements:- correlation indexes below 0.3 : simulated peaks to fine in timecompare to the observed ones- mean/background value are generally lower in simulations compare to observations

I-1. Primary pollutants : SO2

Developement and localisation of SO2 plumes compare to the CO plumes

I-1. Primary pollutants : SO2

More stations, but comparisons are worse:- correlation indexes below 0.2, close to zero sometimes - some simulated strong and large peaks in time not observed

Too coarse resolution to model such specie ? Mismatch between the emission inventory and the reality ?

I-2. Ozone precursors: NO2

Common simulated temporal evolution: - High concentrations on large areas at night- 09htu : slight decrease in space and intensity- 12htu : decrease of the concentration- 15htu : high NO2 values limited to the main sources emissions- 18htu : concentrations and plumes increase

Use of the same meteorological forcing (Aladin): close pattern during night/morning

Quite agreement in regards to the spatial resolution :Azur/Chimere1, Chimere-Acri, Rams-CAMX, Mocage1,

Except at the north-west corner around Avignon

Second group of comparable simulations :Uam-Total1 and Polair

Models with specific behaviour: - MC2-AQ : Large and strong plumes above sea - Meso-NHC: small plumes (or none) above sea

- Rams-moca1, Rams-moca2, Rams-Racm: mean values- Tcam1 low inland background values (appears at 09htu, max. at 15 htu)

- Correlation indexes:- Relatively small between 0.2/0.4-0.5, even worse during the IOP2b (below 0.2)

- MBE on all value- IOP2a: from –10 to –20 ppb, highest value: MOCAGE1, RAMS-MOCA, MC2-AQ- IOP2b: from –10 (RAMS-MOCA, MC2-AQ) to +10 ppb (Meso-NHC, Chimere-ACRI)

- MBE on peaks:

- IOP2a: -20 to –50 ppb (MOCAGE1, RAMS-MOCA, MC2-AQ), except UAM-TOTAL1 (some over-estimation some days)

- IOP2b: -10/20 ppb (MOCAGE1, RAMS-MOCA) to +20 ppb (others models)

Simulated peaks « near the surface » are too strong, whereas

simulated values at high altitudes are too low

Forecast of 1 hour NO2 above 135 ug.m-3:

- Quite good for all box-zones and IOPs- problems concerns mainly two models: MC2-AQ and Meso-NHC which simulate false alerts for the boxzone 1 and the boxzone 3

Forecast of 1 hour NO2 above 200 ug.m-3:

- Quite good for all box-zones and IOPs- problems concerns mainly MC2-AQ and to a less extent Meso-NHC : false alerts for boxzones 1 and 3- other models miss some exceedances sometimes

I-2. How models reproduce Ozone

21/06:• 09Htu : mean background, titration above main sources

- Titration: rams-racm- Background: mc2-aq, mocage1, polair,rams-camx1, rams-moca1

• 12Htu : mean (60-70) background, peaks east of Berre/Marseille- background: mc2-aq, mocage1, polair,- good plumes : chimere-acri, meso-nhc, mocage1,- false plumes : chimere1, mc2-aq, meso-nhc,mocage1,polair,

rams-camx1,rams-moca1,rams-moca2, rams-racm,uam-total1

• 15Htu : low values at centre/north-west, plumes near Toulon- Low values: chimere1,Chimere-acri, meso-nhc, rams-camx1,

rams-moca1, rams-moca2,rams-racm,uam-total1- good plumes : chimere1,meso-nhc, polair,rams-moca1 ,rams-racm,uam-total1- false plumes : chimere-acri, mc2-aq, meso-nhc,mocage1, rams-camx1,

rams-moca2

21/06:• 18Htu : mean values at coast, peaks at coast, low values in Durance Valley

- Durance valley good: mocage1, polair- peaks: Chimere1,chimere-acri, mc2-aq, mocage1, polair, rams-camx1,

rams-moca1,rams-moca2,rams-racm, uam-total1- mean values: Chimere-acri, mc2-aq, rams-camx1,rams-moca1,rams-racm

MODELISED PLUMES PATTERN:Specific: Chimere-acri, Meso-nhc, polair,rams-moca1,rams-moca2Close: Chimere1,rams-camx1,rams-racm,uam-total1Close: Mocage1, mc2-aq,

22/06:• 09Htu : mean background, titration durance

- Good Titration: mc2-aq, mocage1, polair- Background: mc2-aq, Meso-nhc (east), mocage1, polair,rams-camx1 (east),

rams-moca1,rams-moca2(east), uam-total(titration)

• 12Htu : mean (60-70) background- Background: mc2-aq, polair, uam-total1- False plume: Chimere-Acri, mocage1, rams-racm

• 15Htu : increase of background + peaks near Toulon- background : mc2-aq (north-east), mocage1 (north-east), polair- good plumes : chimere1, Chimere-acri, meso-nhc,mocage1, polair,

rams-camx1,rams-moca1,rams-racm, uam-total1- false plumes : mc2-aq, rams-moca2

22/06:• 18Htu : mean values with increase near the coast

- background : mc2-aq, mocage1 (north), Polair (north-east), rams-moca1( coast)- titration : chimere1, Chimere-Acri, Meso-nhc, rams-camx1, uam-total1- false plumes : mc2-aq, rams-racm,

MODELISED PLUMES PATTERN:Specific: mc2-aq, rams-moca1,rams-moca2Close: Chimere1,Chimere-Acri, Meso-nhc, mocage1,(Polair),

rams-camx1, rams-racm,uam-total1

23/06:• 09Htu : mean background, titration durance

- Good Titration: Chimere-Acri, mc2-aq, mocage1, polair, rams-camx1, uam-total1- Background: Chimere-Acri, mc2-aq, Meso-nhc,mocage1, polair, rams-camx1,

rams-racm,uam-total1

• 12Htu : low values, mean (60-70) at coast/north-east- good low values: mc2-aq- background : mc2-aq, mocage1 (north), Polair (north)- False plume: Chimere-Acri, mocage1, rams-moca1, rams-racm,

uam-total1

• 15Htu : low values larger in space, mean values near Toulon/coast- good background : mc2-aq (north only), meso-nhc (north-east only),

mocage1 (north only), polair- good Toulon : chimere1, mocage1, polair, rams-moca1,

rams-moca2, rams-racm- false plumes : chimere-Acri, uam-total1

23/06:• 18Htu : increase of background values and near main emissions sources

- background : mc2-aq, Polair (north-east)- Titration : Chimere1,Chimere-Acri, mc2-aq, Meso-nhc, Polair, rams-camx1,

rams-moca2, rams-racm - false plumes : Chimere-Acri, uam-total1

MODELISED PLUMES PATTERN:Specific: mc2-aq, Polair,Close: Chimere-Acri, mocage1, rams-moca1, rams-racm, uam-total1Close: Chimere1,Meso-nhc, rams-camx1, rams-moca2

24/06:• 09Htu : mean background, titration Marseille/durance

- Good Titration: mc2-aq, Meso-nhc,polair, rams-moca1, uam-total1- Background: mc2-aq, Meso-nhc, mocage1, polair, rams-moca2, rams-racm,

uam-total1

• 12Htu : mean (60-70), plumes from Alpilles/salon de provence- background : mc2-aq (Toulon), mocage1 (north-east), polair (north-east),

rams-moca2 (source)- False plumes: Chimere1,Chimere-acri, mc2-aq (too east),

meso-nhc (too east), mocage1, rams-racm- good plumes: Chimere-acri, mocage1, Polair, rams-moca1, rams-racm,

uam-total1

• 15Htu : plumes extends to the north-east-False plumes : chimere1(too east) , mc2-aq (too east), mocage1,

Meso-nhc (too north-east), Uam-total1 (too east),rams-moca1 (too large and at the coast),

- good plumes : chimere1, chimere-acri, mc2-aq, mocage1

24/06:• 18Htu : titration above sources, plumes at the north-east

- background : mocage1 (north-east), Polair (at the plume)- bad Titration : mc2-aq, mocage1, rams-moca1,rams-moca2- good plumes : Chimere1, Chimere-Acri, mocage1- false plumes : mc2-aq (too east), mocage1 (toulon), rams-moca1, rams-racm,

uam-otal1 (west border)

MODELISED PLUMES PATTERN:Specific: Meso-nhc, mocage1, Polair, rams-moca2, rams-camx1Close: Chimere1, Chimere-Acri, rams-moca1Close: mc2-aq, rams-racm,Uam-Total1

25/06:• 09Htu : mean background, titration Marseille/coast

- bad Titration: mc2-aq (large), Meso-nhc (large), mocage1, rams-camx1 (large), rams-moca2 (none), rams-racm (none)

- Background: mc2-aq (high), mocage1,Polair (north), rams-moca1 (west), rams-racm (high)

• 12Htu : mean (60-70), large plume from east of berre to north-west- background : mocage1 (north-east), rams-moca1 (low coast),

rams-racm (large plumes)- False plume: meso-nhc, mocage1 (coastline), rams-moca1 (too north),

rams-racm- good plumes: Chimere1, Chimere-acri, mc2-aq, Polair, rams-racm

• 15Htu : mean values sources/coast, large plumes- background : chimere1 (toulon), mocage1 (NO), rams-moca1 (low coast)- False plumes : Meso-nhc (NE only), mocage1 (NE only),

rams-moca1 (too north), uam-total1(W et E)- good plumes : chimere1 (miss NE), Chimere-acri (miss NE), mc2-aq,

Polair (low W), rams-moca2, rams-racm

25/06:• 18Htu : decrease of background, plumes at NE

- background : mocage1 (north-east), rams-racm (low coast)- bad Titration : Chimere1, Chimere-acri, mc2-aq, rams-camx1, uam-total1- good plumes : Chimere1, Chimere-acri, MC2-aq, mocage1, rams-racm- bad plumes : Meso-nhc (too early), rams-moca2 (too early)

MODELISED PLUMES PATTERN:Specific: rams-camx1, uam-total1Close: Chimere1, mc2-aq, Meso-nhc, mocage1, rams-moca1, rams-moca2,

rams-racmClose: Chimere-acri, Polair

26/06:• 09Htu : mean background, titration source

- bad Titration: mc2-aq (too north), rams-camx1 (large), rams-moca1 (too large), rams-moca2 (too large), uam-total1 (large)

- Background: Chimere1 (plume at E), Chimere-acri (high toulon), mc2-aq (plume at E), mocage1 (large low), rams-racm (plume at E)

• 12Htu : mean+ (70-80), peaks at north-west, mean values around toulon-Background: mocage1 (NE), rams-moca1 (source), rams-moca2,

uam-total1 (source)- Toulon : Chimere1, Chimere-acri- False plumes: Chimere1, Chimere-acri, mc2-aq, Meso-nhc (NE), mocage1,

rams-racm(E), uam-total1 (E)- good plumes: (chimere1), chimere-acri, (mc2-aq), rams-moca2, rams-racm

26/06:• 15Htu : mean values sources/coast, peaks center of the domain

- background : chimere1 (plume too large),chimere-acri (high sea), mocage1 (border), rams-moca1 (low), rams-moca2 (low)

- false plumes : Meso-nhc (too NE), rams-camx1 (too NE), rams-racm (too NE), uam-total1 (too NE)

- good plumes : chimere1, chimere-acri (too W), mc2-aq (W, strong), mocage1

• 18Htu : titration coast + peaks near cadarache- background : chimere-acri (high sea), mocage1 (NE, NW),rams-moca1 (low),

rams-moca2 (low), uam-total1- bad Titration : Meso-nhc (too inland), rams-racm (large)- good plumes : Chimere1, mc2-aq- false plumes : mocage1 (too N), rams-racm (too NE)

26/06:MODELISED PLUMES PATTERN:

Specific: Chimere-acri , mocage1, PolairClose: Chimere1, mc2-aqClose: Meso-nhc, rams-camx1, rams-racm, (uam-total1)Close: rams-moca1, rams-moca2

02/07:• 09Htu : low west, mean east

- Background: Chimere1 (W), mc2-aq (SE), mocage1 (source), polair, rams-moca2 (W), rams-racm(W),UAM-Total1 (Toulon)

• 12Htu : increase of O3, high value coast/berre/marseille- background : chimere1 (too large), mc2-aq, mocage1 (N), Polair,

rams-racm (too large), UAM-Total1 (too large)- False plumes: Chimere-acri (too W), mc2-aq (N), mocage1 (too W),

rams-moca1 (N), rams-moca2 (NE)- good plumes: Chimere1, rams-racm, UAM-Total1

• 15Htu : extent of the plumes- background : Chimere1 (too large), mc2-aq, Polair (low),

rams-racm (too large), uam-total1 (too large)- False plumes : Chimere-acri (too NO), mc2-aq (NE), Meso-nhc (NE),

mocage1 (NE), rams-moca1 (too NO), rams-moca2, uam-total1 (too large)

- good plumes : Chimere1, rams-racm

02/07:• 18Htu : mean coast, plumes to the north

- background : mc2-aq, polair (north), rams-racm (too large), uam-total1 (coast)- bad Titration : Chimere1, Chimere-acri- good plumes : Chimere1, Chimere-acri, rams-racm- false plumes :mc2-aq(NE), Meso-nhc, mocage1, RASM-MOCA1 (NE),

rams-moca2 (N), UAM-Total1

MODELISED PLUMES PATTERN:Specific: Chimere, mc2-aq, Meso-nhc, mocage1, Polair, UAM-Total1Close: Chimere-acri, rams-moca1, (rams-moca2), rams-racm

03/07:• 09Htu : mean values, peaks at north

- Background: mc2-aq, Meso-nhc, mocage1, polair,rams-moca1, rams-moca2 (NE),rams-racm(NE), uam-total1 (coast,NE)

- good peaks: mc2-Aq

• 12Htu : mean values coast, plumes from avignon to cadarache- good coast : Meso-nhc, mocage1, Polair, rams-moca2- False plumes: mc2-aq (too N, E), Meso-nhc (too N), rams-moca1 (NE),

rams-moca2 (NE), uam-total1- good plumes: Chimere1 (too large), Chimere-acri, Mocage1 (too large),

rams-racm

• 15Htu : increase of values, plumes to NE- background : Chimere1 (coast), mc2-aq (coast), Meso-nhc (low source),

Mocage1 (W), Polair (W, N), rams-moca1, uam-total1 (coast)- False plumes : mocage1 (too NE), rams-moca2 (too NE), rams-racm (too NE)- good plumes : Chimere1, Chimere-acri, mc2-aq

03/07:• 18Htu : titration at source, plume at NE

- background : mc2-Aq (coast), Meso-nhc, mocage1, rams-moca1, rams-moca2, uam-total1 (coast)

- good plumes : Chimere1, Chimere-acri, mc2-aq, mocage1

MODELISED PLUMES PATTERN:Specific: Meso-nhc, Polair, Uam-total1Close: Chimere1, mc2-aqClose: Chimere-acri, mocage1Close: Rams-moca1, rams-moca2, rams-racm

04/07:• 09Htu : mean values, titration at coast

- Background: mc2-aq (high! at NE), Meso-nhc (NW), Mocage1, rams-moca1- good coast: Meso-nhc, Mocage1, Polair, RAMS-moca1

• 12Htu : (70-80) from avignon to salon de provence- backgound : meso-nhc (low coast)- good plumes: chimere1, chimere-acri (N), mc2-aq (too NE), Mocage1,

rams-moca2 (too NE), rams-racm

• 15Htu : low values at coast, plumes from salon to the north- good coast : Meso-nhc- good plumes : chimere1, mc2-aq (too E), Mocage1

03/07:• 18Htu : low values sources/coast, mean values

- background : Meso-nhc (too low), rams-moca1( too low E)- good titration: chimere1, chimere-acri, mocage1, rams-moca2

MODELISED PLUMES PATTERN:Specific: Meso-nhc, mocage1, polair, rams-moca1, rams-moca2, uam-total1Close: chimere1, chimere-acriClose: mc2-aq, rams-racm

II-1 : Similarities and differences between models

NIGHT PATTERN:

• MOCAGE1 simulates large and strong low ozone field

• RAMS-MOCA1, MC2-AQ, (Meso-NHC) under-estimate ozone

• RAMS-MOCA2 and RAMS-RACM simulate high ozone

• Few models achieve to reproduce correctly the low ozone in the durance valley, but some models reproduce well the background ozone at elevated sites.

MORNING PATTERN (09htu):

• CHIMERE1 AND AZUR simulate a quasi homogeneous field (~ 50-60 ppb)

• MOCAGE1 under-estimates ozone

• MAPOM simulates a very high ozone value above sea which will lead to very high values above land during the day

• Polair pattern is nearly similar from one day to another ones (band of background ozone along the coastline surrounded by low values everywhere

DAILY PATTERN:

• Few models show a specific comportment observed every day (Low values at the north/north-west border in MOCAGE simulations, high over-estimation by Mapom, high ozone at west border in UAM simulations…)

• Specific comportment is more dependant to the day:

Example: 02 July: low ozone plume in MC2-Aq, high and large ozone plumes in Chimere1, wrong localisation in MOCAGE1 …

• 26 June = day with the highest simulated ozone values (MC2-AQ)

DAILY PATTERN: some different behaviours are observed from one IOP to another ones

• much high ozone above sea and inland during IOP3 for Chimere1, UAM-total1 compared to IOP2a/2b

• lower inland values for Meso-NHC during IOP3 compared to IOP2a/2b

• high inland ozone during the 25/06, 26/06, 03/07, 04/07 compared to very low values for the other days

for Polair

Lowest correlation factor: RAMS-MOCA2/RAMS-RACM due to a general night-time over-estimation

Temporal evolution: Quite good reproduced (correlation between 0.6/0.8)

Sometimes all models for one zone/one day

have bad correlation factor

One model which has a general good correlation,

can be bad sometimes

None perfect model Temporal evolution:

Range of MBE is between –10 ppb to +15/+20 ppbMBE on all values:

Highest MBE: generally MAPOM, RAMS-RACM simulation

MBE on all values: No tendency when we consider all models,

except during IOP 2b for zone 1/4/5/6

MBE on all values:

As for correlation factor , sometimes a « good » model can be bad (high MBE)

MBE on all values:

Do we observe a general tendency for each model ?

- for Mapom, Mocage 2: positive MBE for near all cases

- for few models (Chimere, azur, acri, mocage1,…): yes, but depend of the IOP

- for others: positive or negative MBE

Do we observe a general tendency for each box-zone ?

Sign of MBE change with IOP and with models

Does results comparable for simulations using the same meteorological forcing conditions ?

- Chimere 1 / Azur : yes for all IOP

- Rams-moca2 / Rams-Racm : no

- Mocage 1 / Rams camx2 / Chimere 2: - IOP 1 : Chimere 2 come close to Mocage1- IOP 2a: For some box-zone Chimere2 and Rams-camx2 come close to Mocage1- IOP 2b/4 : No !

MBE on all values:

Range of MBE on maximum and minimum value is greater than on all value: -25/+25 ppb

MBE on extreme values:

MBE on maximum values:

On maximum, tendency can be variable between models, but highest differences are generally observed for the same stations

Accuracy (%) of Unpaired ozone peak for IOP 2b

POLAIR CHIMERE-ACRI UAM-TOTAL

Such high differences at a specific station are generally observed for all IOPs

MBE on minimum values:

On minimum, models generally over-estimate ozone

- Chimere 1 / Azur : yes but difference is higher than on all values

- Rams-moca2 / Rams-racm : no- Mocage 1/Rams camx2 /Chimere2 : no

Zone 3IOP 2b

MBE onMax.

Does models using the same meteorology lead to the same differences on maximum and minimum ?

I-2. How models reproduce Ozone: Chemical forecasting

Ozone maximumsObserved the 21, 22and 23 June 2001.

I-2. How models reproduce Ozone: Chemical forecasting INFORMATION LEVEL > 180 ug/m3

Some models lead to false alerts (Mapom, Mocage 2 and Chimere-acri)

I-2. How models reproduce Ozone: Chemical forecasting INFORMATION LEVEL > 180 ug/m3

Models which predict good exceedanceslead also to false alerts

I-2. How models reproduce Ozone: Chemical forecasting ALERT level > 240 ug/m3

No observed exceedances, Two cases of false alerts with Mapom and Mocage 2 simulation

Ozone maximumObserved the 24, 25and 26 June 2001.

I-2. How models reproduce Ozone: Chemical forecasting INFORMATION LEVEL (>180 ug/m3)

Zone 3 = zone with the maximum number of observed exceedances :

½ models predict it correctly (½ models miss it)

Zone 1: Numerous false alerts for day 1

Exceedances for the day 2 are not predicted correctly by all models

ozone value above 240 ug/m3 are observed for zone 3 and zone 4

Near all models do not simulate such exceedances

Number of False alerts are higher than for IOP2a/ IOP3

Ozone maximumObserved the 02, 03and 04 July 2001.

1/2 models do not simulate correctly exceedances for the zone 3

I-2. How models reproduce Ozone: Chemical forecasting ALERT LEVEL (> 240 ug/m3)

No observed exceedances,

few cases of false alerts with MAPOM and MOCAGE 2 simulation

- Mapom, Mocage 2: over-estimation of ozone value lead to false alerts for 180 and 240 ug/m3 limit, but prediction of observed exceedances for 180 ug/m3 is good …

- Generally 1/2 models do not simulate correctly the observed exceedances for 180 ug/m3 (Rams moca, Rams camx, meso-nhc …)

(problem of localisation/Intensity of ozone plumes)

- During IOP2b, all models do not simulate the high ozone value above 240 ug/m3 observed in the northen rural part of the ESCOMPTE domain (zone 4)

(high ozone plumes do not go as far inland as in observations)

PHOTOCHEMICAL PRODUCTION OF OZONE:OH

II-2 : Does photochemical ozone production work in a similar way: Comparison on OH

OH patterns are relatively quite similar despite the various chemical scheme used

First group : Chimere1 , Chimere-Acri (more intense on boat roads and at teh south-east/Toulon), RAMS-CAMX1 (less intense above sea)

Second group : Polair (thinnest plumes) and MOCAGE1 : lower intensity than first group (close to RAMS-CAMX1)

Specific patterns : RAMS-MOCA1 (large high OH values around main emission sources) , RAMS-MOCA2 (opposite) ,RAMS-RACM (RAMS-MOCA1 whith higher background values => pattern of RAMS-CAMX1 but with different intensity)

Use of Aladin meteorological field : RAMS-CAMX2 close to RAMS-CAMX1CHIMERE2 close to CHIMERE1 (except near Avignon)

TCAM1 close to RAMS-CAMX2 (but intensity is very higher for background and plumes)

At the beginning of the photochemical production:generally we observed coherence between OH and O3 patterns

But not after: effect of transport of pollutants and precursors ?

PHOTOCHEMICAL PRODUCTION OF OZONE:Chemical indicators

II-2 : Does photochemical ozone production work in a similar way: Comparison of VOC/NOX limited regimes

Area of O3 production limited by VOC vary strongly according to the indicator used:Uncertainties linked to some process such as dry deposition on HNO3 ….

Comparison based on O3/NOz:Chimere1, Azur, RAMS-CAMX1: close patternsChimere-Acri: close too except the marine plumes, and at the north-west

Comparison based on O3/NOz:Meso-NHC and UAM-TOTAL1: limited VOC-limited area above sea

inland area larger than Chimere1

Comparison based on O3/NOz:RAMS-MOCA1, RAMS-MOCA2, RAMS-RACM: close

Comparison based on O3/NOz:MOCAGE1 : pattern generally quite different with large inland area

defined as VOC-limited

Comparison based on O3/NOz:difference between models are yet subject to some uncertainties, such as which species are regrouped in NOz in the different models (and how species of this model specie are deposited at the surface between the models)

=> the use of such indicators is difficult

COMPARISON OF DIFFERENT PROCESSES:Photolysis rates

II-4 : Are photochemical rates similar : JNO2

“Reference state”:

25th June 2001 - Hour 12.00 UTC - 10 m agl

Comparisons concerning:

- Different models: RAMS- CAMx, MOCAGE 1, AZUR, CHIMERE 1, RAMS-MOCA2

- Different hours: 9.00, 12.00, 15.00 UTC

- Different heights: 10, 500, 4000 m agl

- Different IOP: IOP2a, IOP2b (IOP1,IOP3)

JNOJNO22 - 25 June 2001 H 12.00 - 10 m agl - 25 June 2001 H 12.00 - 10 m aglII-4 : Are photochemical rates similar : JNO2

JNOJNO22 - 25 June 2001 H - 25 June 2001 H 09.0009.00 - 10 m agl - 10 m agl

JNOJNO22 - 25 June 2001 H - 25 June 2001 H 15.0015.00 - 10 m agl - 10 m agl

JNOJNO22 - 25 June 2001 H 12.00 - - 25 June 2001 H 12.00 - 500500 m agl m agl

JNOJNO22 - 25 June 2001 H 12.00 - - 25 June 2001 H 12.00 - 40004000 m agl m agl

JNOJNO22 - 25 June 2001 H 12.00 - 10 m agl - 25 June 2001 H 12.00 - 10 m agl

JNOJNO22 - - 2222 June 2001 H 12.00 - 10 m agl June 2001 H 12.00 - 10 m agl

JNOJNO22 - H 12.00 - - H 12.00 - O3 H 15.00O3 H 15.00

22 June15 June 25 June 2 July

JNOJNO22 - - SummarySummary

25/6- 9.00

[s-1 1E-2]630 650 670 690 710 730 750

U TM km

Marseille

Aix en ProvenceSaint Chamas

Toulon

Port de Bouc

Avignon

[s-1 E -2]

630 650 670 690 710 730 750UTM km

Marseille

Toulon

Port de Bouc

Avignon

[s-1 E -2]

25/6-12.00

25/6-15.00

22/6-12.00

630 650 670 690 710 730 750U TM km

Marseille

Toulon

Port de Bouc

Avignon

[s-1 E -2]

630 650 670 690 710 730 750U TM km

Marseille

Toulon

Port de Bouc

Avignon

[s-1 E -2]

630 650 670 690 710 730 750U TM km

Marseille

Toulon

Port de Bouc

Avignon

[s-1 E -2]

630 650 670 690 710 730 750

U TM km

Marseille

Toulon

Port de Bouc

Avignon

[s-1 E -2]

MO10 m 500 m

630 650 670 690 710 730 750U TM km

Marseille

Toulon

Port de Bouc

Avignon

[s-1 E -2]

Range of variability

± 12% - ± 25%

II-4 : Are photochemical rates similar : JO3

JJOO33 - 25 June 2001 H 12.00 - 10 m agl - 25 June 2001 H 12.00 - 10 m agl

JOJO33 - 25 June 2001 H - 25 June 2001 H 09.0009.00 - 10 m agl - 10 m agl

JOJO33 - 25 June 2001 H - 25 June 2001 H 15.0015.00 - 10 m agl - 10 m agl

JOJO33 - 25 June 2001 H 12.00 - - 25 June 2001 H 12.00 - 500500 m agl m agl

JOJO33 - 25 June 2001 H 12.00 - - 25 June 2001 H 12.00 - 40004000 m agl m agl

JOJO33 - 25 June 2001 H 12.00 - 10 m agl - 25 June 2001 H 12.00 - 10 m agl

JOJO33 - - 2222 June 2001 H 12.00 - 10 m agl June 2001 H 12.00 - 10 m agl

JOJO33 and JNO and JNO22 - H 12.00 ---- O3 - H 15.00 - H 12.00 ---- O3 - H 15.0022 June15 June 25 June 2 July

JOJO33 - - SummarySummary

25/6- 9.00

[s-1 1E-5]630 650 670 690 710 730 750

UTM km

Marseille

Toulon

Port de Bouc

Avignon

1.001.251.501.752.002.252.502.753.003.253.503.754.004.254.504.755.00

[s-1 E-5]

630 650 670 690 710 730 750U TM km

Marseille

Toulon

Port de Bouc

Avignon

[s-1 E -2]

25/6-12.00

25/6-15.00

22/6-12.00

630 650 670 690 710 730 750U TM km

Marseille

Toulon

Port de Bouc

Avignon

[s-1 E -2]

630 650 670 690 710 730 750U TM km

Marseille

Toulon

Port de Bouc

Avignon

[s-1 E -2]

630 650 670 690 710 730 750

U TM km

Marseille

Toulon

Port de Bouc

Avignon

[s-1 E -2]

MO10 m

630 650 670 690 710 730 750U TM km

Marseille

Toulon

Port de Bouc

Avignon

[s-1 E -2]

± 8% - ± 24%

• J clearly depends on hour and height, but to a lesser extent on IOP and horizontal coordinate (except for MOCAGE)

• Models usually have shown a coherent behaviour, more for JNO2 than JO3

• O3 concentrations are not directly linked to J values

• Models have highlighted a range of variability of 12% to 25% for both rates

II-4 : Are photochemical rates similar

COMPARISON OF DIFFERENT PROCESSES:Dry deposition

II-4 : How compare dry deposition of ozone

“Reference state”:

25th June 2001 - Hour 12.00 UTC

Comparisons concerning:

- Different models: RAMS-CAM1, MOCAGE 1, AZUR, CHIMERE 1, RAMS-MOCA2

- Different hours: 0.00, 6.00, 12.00, 18.00 UTC

- Different IOP: IOP2a, IOP2b (IOP1,IOP3)

Vdep OVdep O33 - 25 June 2001 H 12.00 - 25 June 2001 H 12.00

Vdep OVdep O33 - 25 June 2001 H - 25 June 2001 H 00.0000.00

Vdep OVdep O33 - H 12.00 - H 12.0022 June15 June 25 June 2 July

Vdep OVdep O33 – – O3 - O3 - H 12.00 H 12.0022 June15 June 25 June 2 July

Vdep OVdep O33 - - Summary of Maximum valuesSummary of Maximum values

630 650 670 690 710 730 750UTM km

Marseille

Toulon

Port de Bouc

Avignon

[s-1 E -2]

630 650 670 690 710 730 750UTM km

Marseille

Toulon

Port de Bouc

Avignon

[s-1 E -2]

630 650 670 690 710 730 750UTM km

Marseille

Toulon

Port de Bouc

Avignon

[s -1 E -2]

630 650 670 690 710 730 750UTM km

Marseille

Toulon

Port de Bouc

Avignon

[s-1 E -2]

630 650 670 690 710 730 750UTM km

Marseille

Toulon

Port de Bouc

Avignon

[s-1 E -2]

[cm s-1]

22/6RC1/2

H 0.00

± 25% - ± 50%

630 650 670 690 710 730 750

UTM km

Marseille

Toulon

Port de Bouc

Avignon

[cm /s] 0.0

H 18.00H 12.00H 6.00

• Vdep is function of both time and space (turbulence and Land use)

• Models estimations have shown a quite coherent behaviour

• Range of variability among models spans from 25% to 50% (for the maximum value over the domain)

• Possible link between O3 concentrations and Vdep

4th workshop of the excompte modelling exercise chemical aspects:

primary pollutants

intense plumes close

plumes increasei

localisation of so2

mocage1 azur close

racm close

close pattern

simulated peaks

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