The Megha-Tropiques Mission May 8,, 2010 0600Z courtesy www.satmos.meteo.fr Rémy Roca and the French MT science team
Overview Indo-french mission realized by The Indian Space Research Organisation et the Centre National d Etudes Spatiales Dedicated to the Water and energy cycle in the Tropics Low inclinaition on the equator (20 ); 865 km height High repetetivity of the measurements Launch foreseen in early 2011 WEB site http://megha-tropiques.ipsl.polytechnique.fr
Scientific objectives Atmospheric energy budget in the intertropical zone and at system scale (radiation, latent heat, ) Life cycle of Mesoscale Convective Complexes in the Tropics (over Oceans and Continents) Monitoring and assimilation for Cyclones, Monsoons, Mesoscale Convective Systems forecasting. Contribution to climate monitoring : Radiative budget (complementary to CERES) Precipitation (enhanced sampling in the tropics; link to the GPM program) Water vapour (enhanced sampling in the tropics),
Payloads (1/2) Source: N. Karouche, CNES MADRAS : microwave imager for precipitation : channels at 18, 23, 37, 89 and 157 GHz, H and V polarisations. (conical swath, <10 km to 40 km) Source: N. Karouche, CNES
Payloads (2/2) SAPHIR : microwave sounder for water vapour sounding : 6 channels in the WV absoption band at 183.31 GHz. (cross track, 10 km) ScaRaB : wide band instrument for inferring longwave and shortwage outgoing fluxes at the top of the atmosphere (cross track scanning, 40 km resolution at nadir) Source: N. Karouche, CNES GPS RO: water vapor profile GEOSTATIONARY DATA Cloud mask for the MW algo Quicklook for interpreting MT data Basic inputs for MCS tracking algorithm Basic inputs for Level 4 rainfall (radiation) products
Orbit (1/2)
Orbit (2/2) Half day Mean number of overpasses per day Latitude 1 orbit MADRAS sampling over 20 S-20 n Min 3 per day Max 5 per day 3 4 5 6
Life cycle of Mesoscale Convective Systems Simulation of orbit with MADRAS/MT
The Megha-Tropiques data & products Instantaneous scale «LEVEL 2» *Profile of rainfall, surface rainfall, convective/stratiform flag BRAIN Algorithm using mainly MADRAS Poster by N Viltard et al (presented by PE Kirstetter) *Profile of relative humidity using mainly SAPHIR Poster by Brogniez, Aires et al (presented by F Marquisseau) ScaRaB/GERB Simultaneous SW co-location *TOA broad band flux SW, LW SEL/SANN algorithm Poster by O Chomette et al.
The Megha-Tropiques data & products Agregated scale «Level 3 +» Combination of instruments Niamey AMMA 2006, filtered 3-5 days EPSAT-GPCP GSMAP *Accumulated surface rainfall 1 1 day And associated error estimation TAPEER Algorithm using BRAIN and GEO Poster by P Chambon et al. TMPA TAPEER-BRAIN Composite life cycle of MCS TOOCAN algorithm using BRAIN and GEO Poster by T Fiolleau et R. Roca *TOA broad band flux SW, LW monthly mean Poster by O Chomette et al.
The Megha-Tropiques data & products An example of instrumental combinaison : SCARAB+SAPHIR to study the greenhouse effect NCEP+METEOSAT+CERES Summer TS OLR FTH Ga Poster by R Guzman et al (presented by L Picon)
Operational use and CAL/VAL activities METEO-France has two main on going operational activities with MT DATA assimilation all over the Tropics Towards all weather assim of radiances Talk by F Karbou et al. Cyclones forecasting activities MW data used for ARPEGE-Réunion forecast model initialisation Anticipated use of NRT data for forecasting Talk by M Plu et al. The MT CAL/VAL program is large with main efforts in West Africa, India, Brazil! Would require a talk by itself! By then ask M Gosset / me
Operational use and CAL/VAL activities METEO-France has two main on going operational activities with MT DATA assimilation all over the Tropics Towards all weather assim of radiances Talk by F Karbou et al. Cyclones forecasting activities MW data used for ARPEGE-Réunion forecast model initialisation Anticipated use of NRT data for forecasting Talk by M Plu et al.
Meteorological radars -> dedicated campaigns. need of a super site for MIT C-Band radar (250 km range) 1 dual pol radar 2 radars : 1 long range, 1 shorter range attenuated but POLARIMETRIC (100 km rangeattenuation)- 2 frequencies - dual Doppler capacity Complementary instruments for validation of QPE and profiles + hydrometeors information :. MRR - profiler disdrometers 14 Rain gages MeghaTropiques Validation - Gosset PMM oct 2009
Airborne validation campaign : hydrometeors type, size distribution and d e n sit y ( k g.m -3) DENSITY Stratiform zone : ice particules density 1000 800 600 400 200 0 convectif 10->20 20->30 30->40 distance from convective zones (km) 40->50 Bouniol et al, 2009 Ice density from airborne AMMA data (rasta+probes) 2010 MeghaTropiques Validation combined : airborne + ground measurement Gosset PMM oct 2009
Summary Due to launch early 2011 Schedule : Launch+3 month: end of commissioning Launch+1 year: end of cal/val period; Start of nominal functionning Level 2 typically within 2 days. Access : on the web Level 1 (Brigthness temperature) typically within 3 hours due to recent enhancement of the reception stations set up. Access: dedicated agreement with CNES/ISRO. Currently the space agencies is working with EUMETSAT to serve as a main node for real time distribution. Active discussions on going. More information: contact R. Roca : roca@lmd.jussieu.fr http://meghatropiques.ipsl.polytechnique.fr
Thank you!