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MOCAGE last results for AMMA Béatrice Josse,Météo-France CNRM/GMGEC/CARMA Paris Workshop, Sept 16-17 2008 Plan I Configuration and experiments II A global / integrated overview III What happens on Africa On the ground In the lower troposphere On the whole vertical

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mocage last results for amma

MOCAGE last results for AMMA

Béatrice Josse,Météo-France

CNRM/GMGEC/CARMA

Paris Workshop, Sept 16-17 2008

slide2
Plan
  • I Configuration and experiments
  • II A global / integrated overview
  • III What happens on Africa
    • On the ground
    • In the lower troposphere
    • On the whole vertical
  • IV Partial conclusions, future plans and questions
mocage configuration for amma

MOCAGE

47 hybrid levels

I Config. and Exp.

MOCAGE configuration for AMMA

GLOBE 2°x2°

AMMA 0.5°x0.5°

Chemscheme : RACMOBUS(strato-tropo)

Subgrid parameterization :

- convection (Bechtold, 2001)

  • scavenging (Mari et al, 2000 + Liu et al, 2001)
  • dry deposition (Wesely, 1989)
  • eddy diffusion (Louis, 1979)
  • Resolved-scale transport :
  • Semi-lagrangian (Williamson et Rasch,1989)
mocage configuration for amma4

Boreal latitude :

Lmax = 6000m

Mid-latitude :

Lmax = 4000m

Tropical latitudes :

Lmax = 1000m

I Config. and Exp.

MOCAGE configuration for AMMA

Injection of Biomass Burning Fires:

  • From Lmax to the ground INJ(L+1) = 0.5 INJ(L)
  • From Lmax+1to Lmax+2 INJ(L–1) = 0.3 INJ(L)
experiments

I Config. and Exp.

Experiments

Hybrid : LA emissions on Africa, RETRO-2000 + GFED elsewhere

emissions

I Config. and Exp.

Emissions
  • Emissions of CO and NOx for Experiment B :
global overview ozone total columns8

II Global and integrated

overview.

Global overviewOzone total columns

MOCAGE

Observations

August

October

The model runs stable throughout 2006

african focus

II Global and integrated

overview.

African Focus
  • Low troposphere CO (~850hPa)

MOPITT

MOCAGE

MOPITT

MOCAGE

August

January

  • Intensity and position of biomass fires well represented
  • Atlantic export well seen, too high in August
  • Underestimation of concentrations above Sahara, Persian Gulf and southern Europe.
african focus12

II Global and integrated

overview.

African Focus
  • Low troposphere NOx : August 2006

MOCAGE 850 hPa

MOCAGE surface

Schiamachy trop. column

Vertical distribution (and hence injections) is crucial

ozone and nox annual cycles at nangatchori

IIIAfrica : at the ground

Ozone and NOx annual cyclesat Nangatchori
  • Ozone and NOx annual cycles well seen
  • Evidence of a lack in NOx ground emissions
  • Waiting for other IDAF sites observations.
amma campaign cotonou august ozone radio soundings

IIIAfrica : on the vertical

surface

850 hPa

600 hPa

AMMA campaignCotonou August Ozone Radio-Soundings

Ozone at different levels in August 2006

Cotonou

amma campaign cotonou august ozone radio soundings15

IIIAfrica : on the vertical

  • Some patterns very well reproduced, some other missed
  • Too much ozone at the surface
  • Chemical tropopause OK.
AMMA campaignCotonou August Ozone Radio-Soundings
amma flights co data m55 data missing

IIIAfrica : on the vertical

Is convection too efficient ?

Amma flightsCO data (M55 data missing)

MOCAGE

Observations

a high temporal variability

IIIAfrica : on the vertical

A high temporal variability

Monthly means for August 2006

Flight zone

The flight zone is at the limit of the mean gradients

a high temporal variability19

IIIAfrica : on the vertical

A high temporal variability
  • Emissions are the same throughout the month
conclusions

IV Conclusions and plans

Conclusions
  • Correct behaviour of MOCAGE, in a global point of view, for CO and Ozone.
  • NOx still have to be investigated. First results seem to point out a relatively good agreement, but ground emissions are lacking. LiNOx to be systematically included.
  • Very high temporal variability in the model, despite constant emissions during a month. Sometimes patterns are captured, sometimes not : Emissions or meteorology?
plans questions and remarks

IV Conclusions and plans

Plans, questions and remarks…
  • Other species have to be looked at : for instance, HCHO seems right, OH seems to be high compared to other models. PAN, HNO3 and H2O2 not yet analysed.
  • Tracer experiments have to be carefully used to explain models behaviour
  • New observations will be (hopefully) soon available, like depositions.
  • New experiments will be made (D, with higher frequency emissions)
plans questions and remarks22

IV Conclusions and plans

Plans, questions and remarks…
  • Analysis of data from flights has to be more carefull than just a 1-plot :

Example of 2 ozone profiles from ATR : over or under-estimation?

plans questions and remarks23

IV Conclusions and plans

Plans, questions and remarks…
  • New experiment (D) + baseline runs + sensitivity to meteorology = lots of experiments !

In the frame of the intercomparison, we need to find performant tests, the amount of data to is at the moment too high

  • The question of emissions is still important : what about biogenics?
biogenic emissions tg c or n
Biogenic emissions (Tg C or N)

E040S59M00IP CO 43.18523

E013S59M90IP HC3 174.6670

E014S59M90IP HC5 49.82963

E015S59M90IP HC8 9.863806

E016S59M90IP ETE 4.931903

E023S59M90IP KET 19.98766

E005S71M00IP NOx 4.999860

E025S90M90GE ISO 503

E026S00M90IP API 127

E027S00M90IP LIM 260