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STUDY OF THE IMPACT OF THE 8 FEB 2001 CONVECTIVE SYSTEM ON THE UTLS AIR COMPOSITION. V. Marécal 1 , E. D. Rivière 1 , G. Held 2 , S. Cautenet 3 , S. Freitas 4 and N. Larsen 5 1 LPCE, Orléans, France, [email protected]

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slide1

STUDY OF THE IMPACT OF THE 8 FEB 2001

CONVECTIVE SYSTEM

ON THE UTLS AIR COMPOSITION

V. Marécal1, E. D. Rivière1, G. Held2, S. Cautenet3, S. Freitas4

and N. Larsen5

1LPCE, Orléans, France, [email protected]

[email protected]

2 IPMet, Bauru, Brazil

3 LAMP, Clermont-Ferrand, Fance

4 CPTEC, Cachoeira Paulista, Brazil

5 DMI, Copenhagen, Denmark

1

slide2

« overshoot »

stratosphere

UTLS

17 km

TTL

tropopause

11 km

deep convection

free troposphere

Boundary layer

emissions

0 km

Mid-latitudes

Tropics

SCIENTIFIC OBJECTIVE

What is the local impact of deep convection on the TTL composition ?

What is the relative contribution of transport and chemistry ?

TOOLS:

- 3D meso-scale simulation with on line chemistryusing the

RAMS-Chemistry model

- Available meteorological and chemistry data

2

slide3

CASE STUDY: THE 8 FEB 2001 CONVECTIVE SYSTEM

BAURU RADAR REFLECTIVITY MEASUREMENTS

22 : 01: 16

8 FEB 2001

21 : 01: 16

8 FEB 2001

20 : 01: 16

8 FEB 2001

19 : 01: 16

8 FEB 2001

18 : 01: 16

8 FEB 2001

02 : 01: 16

9 FEB 2001

01 : 01: 16

9 FEB 2001

00 : 01: 16

9 FEB 2001

23 : 01: 16

8 FEB 2001

17 : 01: 16

8 FEB 2001

3

slide4

STEP 1: METEOROLOGICAL SIMULATION

Grid 1

  • SIMULATION SETUP
  • 42 hours from 2001/02/07 12UT
  • 2 nested grids
  • Grid 1: 20 km horizontal resolution
  • Grid 2: 4 km horizontal resolution
  • - 61 vertical levels from surface to 30km altitude(500m in the UTLS)
  • - Initialisation from ERA40 analysis and radiosoundings
  • Subgrid scale convective parameterization for Grid 1 from Freitas et al (2004)

Grid 2

4

slide5

STEP 1: METEOROLOGICAL SIMULATION

Surface rainfall accumulated from 2001/02/08 15UT to 2001/02/09 00UT

from the Bauru radar

from the RAMS model

5

slide6

STEP 2: SIMULATION WITH ON-LINE CHEMISTRY

  • CHEMISTRY SETUP
  • 29 species and 71 reactions
  • - Gaseous and aqueous chemistry
  • Surface emissions of ozone precursors
  • Parametrization of NOx production by lightning
  • Initialisation from MOCAGE (Météo-France) global fields

6

slide7

DOES THE MODEL PRODUCE REALISTIC

OZONE PROFILES ?

TTL

2004 DMI O3 measurement range

7

slide8

49

416

ch = 11

299

103

733

38

23 % STE

17 % 13 km flux

WHAT ARE THE MAIN CONTRIBUTIONS TO THE

OZONE BUDGET IN THE TTL ?

Ozone budget in the TTL between Feb. 8 @ 00UT and Feb 9. @ 00UT

z

30 km

q = 380 K

13 km

N

Grid 2

w

E

(* 1030 molec of O3)

S

8

slide9

WHAT ORIGINATES THE

STRATOSPHERE-TROPOSPHERE EXCHANGE ?

Horizontal cross-section of vertical velocity at 17.5 km

1200 UT

2200 UT

Wave activity generated by deep convection originates STE

9

slide10

WHY THE CONTRIBUTION OF CHEMISTRY TO

THE OZONE BUDGET IN THE TTL IS WEAK ?

TTL

TTL

TTL

Accumulated O3 production in ppbv

(Grid 2 average)

CO in ppbv

(Grid 2 average)

NOx in ppbv

(Grid 2 average)

10

slide11

17 km

Convective

outflow

13 km

LNOx

0 km

CONCLUSION

stratosphere

Wave from convection  STE

UTLS

Large scale flow

Additional

O3 prod

TTL

tropopause

O3

prod

Additional

O3 prod

deep convection

free troposphere

Boundary layer

O3 precursor emission

Tropics

11

slide12

FUTURE WORK

  • *FURTHER ANALYSIS OF THE 8 FEB 2001 CASE STUDY:
    • ROLE OF SOLUBLE SPECIES (OH, HNO3)
    • SIMILAR ANALYSIS ON A LONGER SIMULATION

* IMPLEMENTATION OF THE CPTEC TRAJECTORY CODE

FOR CHEMICAL SPECIES

* IMPLEMENTATION OF THE RTTOV CODE FOR « MODEL TO SATELLITE » COMPARISONS

* SIMULATIONS FOR THE 13-14 FEB 2004 CASE STUDY (SF2) AND THE 24 FEB 2004 CASE STUDY (SF4)

12

slide13

GOES image 13 feb 2004 1715UT

Vertically-integrated total condensate in mm

from model simulation: 13 feb 2004 1700UT

SIMULATION OF THE 13-14 FEB 2004 CASE STUDY

Vertically-integrated total condensate in mm

from model simulation: 14 feb 2004 0500UT

Time shift possibly related to initialisation from ECMWF analysis

Planned work: initialisation with NCEP or CPTEC products

13

slide14

MANY THANKS TO

Ana Maria Gomes and IPMet collaborators

Gilles Foret - LaMP

INMET

Vincent-Henri Peuch – Météo-France

Jean Luc Athié – LA

Publications submitted to ACDP:

Modelling study of the impact of deep convection on the UTLS air composition.

Par I: Analysis of ozone precursors. Marécal et al.

Modelling study of the impact of deep convection on the UTLS air composition.

Par II: Ozone budget in the TTL. Rivière et al.

14

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