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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] - PowerPoint PPT Presentation
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Workshop Bauru 2004 1
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
1 LPCE, Orléans, France, [email protected] [email protected]
2 IPMet, Bauru, Brazil3 LAMP, Clermont-Ferrand, Fance
4 CPTEC, Cachoeira Paulista, Brazil5 DMI, Copenhagen, Denmark
Workshop Bauru 2004
SCIENTIFIC OBJECTIVE
What is the local impact of deep convection on the TTL
composition ?
TOOLS: - 3D meso-scale simulation with on line chemistry using the
RAMS-Chemistry model
- Available meteorological and chemistry data
UTLSTTL
stratosphere
Boundary layer
free troposphere
TropicsMid-latitudes
emissions
tropopause
« overshoot »
deep convection
11 km
17 km
0 km
2
What is the relative contribution of transport and chemistry ?
Workshop Bauru 2004
CASE STUDY: THE 8 FEB 2001 CONVECTIVE SYSTEM
3
BAURU RADAR REFLECTIVITY MEASUREMENTS
02 : 01: 169 FEB 200101 : 01: 169 FEB 200100 : 01: 169 FEB 200123 : 01: 168 FEB 200122 : 01: 168 FEB 200121 : 01: 168 FEB 200120 : 01: 168 FEB 200119 : 01: 168 FEB 200118 : 01: 168 FEB 200117 : 01: 168 FEB 2001
Workshop Bauru 2004
STEP 1: METEOROLOGICAL SIMULATION
4
SIMULATION SETUP
- 42 hours from 2001/02/07 12UT
- 2 nested gridsGrid 1: 20 km horizontal resolutionGrid 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 1
Grid 2
Workshop Bauru 2004
STEP 1: METEOROLOGICAL SIMULATION
5
Surface rainfall accumulated from 2001/02/08 15UT to 2001/02/09 00UT
from the Bauru radar from the RAMS model
Workshop Bauru 2004 6
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
STEP 2: SIMULATION WITH ON-LINE CHEMISTRY
Workshop Bauru 2004 7
DOES THE MODEL PRODUCE REALISTIC OZONE PROFILES ?
2004 DMI O3 measurement range
TTL
Workshop Bauru 2004 8
WHAT ARE THE MAIN CONTRIBUTIONS TO THEOZONE BUDGET IN THE TTL ?
= 380 K30 km
13 km
EwN
S
z
Ozone budget in the TTL between Feb. 8 @ 00UT and Feb 9. @ 00UT
49
38
103299
416
733
ch = 11
(* 1030 molec of O3)
Vertical Merid. Zonal Chem.
(in % of the total O3 increase)
40 % 144 % -89 % 5 %
Grid 2 23 % STE
17 % 13 km flux
Workshop Bauru 2004 9
WHAT ORIGINATES THE STRATOSPHERE-TROPOSPHERE EXCHANGE ?
Horizontal cross-section of vertical velocity at 17.5 km
Wave activity generated by deep convection originates STE
1200 UT 2200 UT
Workshop Bauru 2004
WHY THE CONTRIBUTION OF CHEMISTRY TO THE OZONE BUDGET IN THE TTL IS WEAK ?
Accumulated O3 production in ppbv(Grid 2 average)
10
TTL TTL TTL
NOx in ppbv(Grid 2 average)
CO in ppbv(Grid 2 average)
Workshop Bauru 2004 11
CONCLUSION
UTLS
Tropics
tropopauseConvective outflow
deep convection
Large scale flow
LNOx
O3
prod
Additional O3 prod
TTL
Boundary layer
free troposphere
O3 precursor emission
stratosphere
13 km
17 km
0 km
Wave from convection STE
Additional O3 prod
Workshop Bauru 2004
FUTURE WORK
12
* 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)
*FURTHER ANALYSIS OF THE 8 FEB 2001 CASE STUDY:• ROLE OF SOLUBLE SPECIES (OH, HNO3)• SIMILAR ANALYSIS ON A LONGER SIMULATION
Workshop Bauru 2004
SIMULATION OF THE 13-14 FEB 2004 CASE STUDY
13
GOES image 13 feb 2004 1715UT Vertically-integrated total condensate in mm from model simulation: 13 feb 2004 1700UT
Vertically-integrated total condensate in mm from model simulation: 14 feb 2004 0500UT
Time shift possibly related to initialisation from ECMWF analysisPlanned work: initialisation with NCEP or CPTEC products
Workshop Bauru 2004 14
MANY THANKS TOAna Maria Gomes and IPMet collaboratorsGilles Foret - LaMPINMETVincent-Henri Peuch – Météo-FranceJean 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.
