STUDY OF THE IMPACT OF THE 8 FEB 2001
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STUDY OF THE IMPACT OF THE 8 FEB 2001 CONVECTIVE SYSTEM ON THE UTLS AIR COMPOSITION PowerPoint PPT Presentation


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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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STUDY OF THE IMPACT OF THE 8 FEB 2001 CONVECTIVE SYSTEM ON THE UTLS AIR COMPOSITION

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Study of the impact of the 8 feb 2001 convective system on the utls air composition

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


Study of the impact of the 8 feb 2001 convective system on the utls air composition

« 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


Study of the impact of the 8 feb 2001 convective system on the utls air composition

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


Study of the impact of the 8 feb 2001 convective system on the utls air composition

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


Study of the impact of the 8 feb 2001 convective system on the utls air composition

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


Study of the impact of the 8 feb 2001 convective system on the utls air composition

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


Study of the impact of the 8 feb 2001 convective system on the utls air composition

DOES THE MODEL PRODUCE REALISTIC

OZONE PROFILES ?

TTL

2004 DMI O3 measurement range

7


Study of the impact of the 8 feb 2001 convective system on the utls air composition

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


Study of the impact of the 8 feb 2001 convective system on the utls air composition

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


Study of the impact of the 8 feb 2001 convective system on the utls air composition

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


Study of the impact of the 8 feb 2001 convective system on the utls air composition

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


Study of the impact of the 8 feb 2001 convective system on the utls air composition

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


Study of the impact of the 8 feb 2001 convective system on the utls air composition

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


Study of the impact of the 8 feb 2001 convective system on the utls air composition

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.

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