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N. Huret(1), G. Durry (2),S. Freitas(3),M.Pirre(1) , A. Hauchcorne(2)

Modelling interpretation of in situ H2O, CH4 and CO2 measured by m 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. OBJECTIVES.

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N. Huret(1), G. Durry (2),S. Freitas(3),M.Pirre(1) , A. Hauchcorne(2)

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  1. Modelling interpretation of in situ H2O, CH4 and CO2 measured by mSDLA 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

  2. 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

  3. Mesoscale interpretation • RAMS/CPTEC model outputs Operational 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

  4. 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

  5. SF4 flight, 24 February 2004 • Tropical Transition Layer : • very strong uplifting from the ground to 17 km 80h before the measurements

  6. Is SF4 17km trajectory realistic ? • Very strong uplifting from the ground to 17 km, 80h before the measurements • Does a strong convective system exist ? • GOES-E satellite cloud MAP • Does RAMS mesocale model predict this convective system at the good location ? • Accumulated precipitation map from RAMS and TRMM satellite data

  7. SF4 RAMS Validation 3 days before the SF4 measurements A strong convective system exists at the location of the uplifting

  8. 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

  9. mSDLA water vapor measurementsSF2/ SF4 comparison • a water vapor bubble from mSDLA (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

  10. Profiles extracted at each grid point in this region RAMS(40 km) grid close to Bauru Bauru

  11. Water vapor excess in the TTL Very dry layer In the UT : SF4 RAMS water vapor profiles Good agreement between RAMS simulation and measurements Except : between 14 and 16 km but not critical between 8-10km in the UT

  12. mSDLA-RAMS temperature profiles comparisons

  13. Bauru Mixing ratio RAMS fields Bauru Strong water vapor gradient south of Bauru The dry layer is predicted by the RAMS model

  14. MIMOSA PV contour advection modelHauchecorne et al. 2001 • On isentropic surfaces MIMOSA calculates the Potential vorticity evolution from ECMWF wind fields. • Global scale transport 340 K isentropic surface

  15. MIMOSA Outputs PV filament coming from low stratopshere mid-latitude with PVU > 2 Large scale isentropic transport

  16. SF4 : CH4 , CO2 , H2O and O3 (sonde)

  17. CONCLUSIONS SF4 flight Strong uplifting from the ground to the TTL (17 km) due to convection Mesoscale transport process Isentropic transport from mid- latitude to the tropical UT (8-10 km) Large scale transport SF4 profiles

  18. Many thanks • TROCCIBRAS partners • team from USP and CPTEC • S. Freitas • P. Leite da Silva Dias

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