N. Huret(1), G. Durry (2),S. Freitas(3),M.Pirre(1) , A. Hauchcorne(2)
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Transcript of N. Huret(1), G. Durry (2),S. Freitas(3),M.Pirre(1) , A. Hauchcorne(2)
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Bauru November 2004
Modelling interpretation of in situ H2O, CH4 and CO2 measured by
SDLA balloon borne instrument (SF2 and SF4 flights).
N. Huret(1),G. Durry (2),S. Freitas(3),M.Pirre(1) , A. Hauchcorne(2)
(1) LPCE/CNRS,France(2)IPSL, Service d’Aéronomie du CNRS,France
(3)CPTEC, Brazil
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Bauru November 2004
OBJECTIVES
• To understand how the convection can modify the Upper Troposphere (UT) and the Tropical Transition Layer (TTL) ?
• What type of model we have to use to investigate the tropical UT and TTL ?
• Previously in polar region and at mid-latitude we used insentropic trajectories from ECMWF
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Bauru November 2004
Mesoscale interpretation• RAMS/CPTEC model outputsOperational mesoscale model (40 km x 40
km)
• 3D trajectory code (Freitas et al. 2000)
– 4 days backward trajectories – 10-20 km every km– Temperature, pressure, water vapor,
liquid water content, solid water content, vertical velocity
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• SF2 flight, 13 February 2004
•Upper troposphere : Air mass ascent from 8 to 10.5 km, 20h before the measurements
•Tropical Transition Layer : nothing special
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• SF4 flight, 24 February 2004
•Tropical Transition Layer : very strong uplifting from the ground to 17 km 80h before the measurements
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Is SF4 17km trajectory realistic ?
• Very strong uplifting from the ground to 17 km, 80h before the measurements
• Does a strong convective system exist ?
•Accumulated precipitation map from RAMS and TRMM satellite data
•GOES-E satellite cloud MAP • Does RAMS mesocale model predict this
convective system at the good location ?
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3 days before the SF4 measurements
A strong convective system exists at the location of the uplifting
SF4 RAMS Validation
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• RAMS validation : accumulated precipitation• RAMS outputs / TRMM satellite data
•This case was very convective because of the South Atlantic Convergence Zone activity• RAMS predictions are validated
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Bauru November 2004
SDLA water vapor measurementsSF2/ SF4 comparison
• a water vapor bubble from SDLA (17 km) for SF4
• can be due to a deep convective system seen on GOES satellite maps and simulated using RAMS mesocale model
• The convection affects the TTL
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Bauru November 2004
RAMS(40 km) grid close to BauruProfiles extracted at each grid point in this region
Bauru
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RAMS water vapor profiles
Water vapor excess in the TTL
Very dry layerIn the UT :
SF4
Good agreement between RAMS simulation and measurementsExcept : between 14 and 16 km but not critical
between 8-10km in the UT
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SDLA-RAMS temperature profiles comparisons
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Mixing ratio RAMS fields
Bauru
Strong water vapor gradient south of Bauru The dry layer is predicted by the RAMS model
Bauru
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Bauru November 2004
MIMOSA PV contour advection model
Hauchecorne et al. 2001• On isentropic surfaces MIMOSA
calculates the Potential vorticity evolution from ECMWF wind fields.
• Global scale transport
340 K isentropic surface
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MIMOSA Outputs
PV filament coming from low stratopshere mid-latitude with PVU > 2Large scale isentropic transport
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SF4 : CH4 , CO2 , H2O and O3 (sonde)
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CONCLUSIONS SF4 flightStrong uplifting from the ground to the TTL (17 km) due to convectionMesoscale transport process
Isentropic transport from mid- latitude to the tropical UT (8-10 km)Large scale transport
SF4 profiles
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Bauru November 2004
Many thanks• TROCCIBRAS partners• team from USP and CPTEC
– S. Freitas – P. Leite da Silva Dias