the megha-tropiques mission - cnripwg/meetings/hamburg-2010/pres/viltard.pdf · 2016-06-07 · n....
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![Page 1: The Megha-Tropiques Mission - CNRipwg/meetings/hamburg-2010/pres/Viltard.pdf · 2016-06-07 · N. Viltard et al, MT Overview, Hamburg, October 2010 The Megha-Tropiques mission Payload](https://reader034.vdocuments.us/reader034/viewer/2022042312/5edaaa326b9d403acf05dfdd/html5/thumbnails/1.jpg)
N. Viltard et al, MT Overview, Hamburg, October 2010
The Megha-Tropiques Mission
Nicolas Viltard, Rémy Rocaand the French MT science team
May 8,, 2010 0600Z courtesy www.satmos.meteo.fr
Mission and Algorithms Status
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N. Viltard et al, MT Overview, Hamburg, October 2010
Overview
The Megha-Tropiques mission
Indian-French mission by
The Indian Space Research Organisation (ISRO) and the
Centre National d’Etudes Spatiales (CNES)
Dedicated to the
Water and energy cycle in the Tropics➔ 865 km Altitude
➔ Low inclination on the equator (20°)
➔ Microwave imager, microwave sounder, broadband imager
High repetitivity of the measurements
Launch foreseen in early 2011
WEB site http://megha-tropiques.ipsl.polytechnique.fr
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N. Viltard et al, MT Overview, Hamburg, October 2010
The Megha-Tropiques missionPayload Courtesy: 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)
Courtesy: N. Karouche, CNES
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N. Viltard et al, MT Overview, Hamburg, October 2010
Orbit characteristics
1 orbit
Half day
Average number of overpasses per day
Latitude
5 63 4
MADRAS sampling over 20°S-20°nMin 3 per day Max 5 per day
The Megha-Tropiques mission
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N. Viltard et al, MT Overview, Hamburg, October 2010
Rain-related Day 1 products
Level 1 (Brigthness temperature) typically within 3 hours due to recent enhancement of the reception stations set up.
Access: dedicated agreement with both CNES & ISRO.
None of the products are currently envisioned in NRT L2 typically within the day of acquisition L3/L4 typically within the month, season of acquisition
L2 Instantaneous scale product from MADRAS and all other microwave imaging platforms (BRAIN algorithm)
Sfc Rain Profile of Rain, graupel, snow, (ice & liquid cloud) content over 28 levels Convective rain fraction
L3/4 Accumulated Surface rain from combined Geo IR + L2 : 1° 1 Day “GPCP like” approach (Main differences in the adjustment steps) Homogeneous over the tropical belt
L3/4 MCS rain life cycle composite from combined Geo IR + L2 Cloud tracking + Merging + compositing
March 2010: French/Indian AO => International science team
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N. Viltard et al, MT Overview, Hamburg, October 2010
The Megha-Tropiques Products BRAIN: instantaneous rain « L2 »
090204-0922 UTC 090204-0945 UTC 090204-1755 UTC 090205-0234 UTC
090205-1006 UTC 090206-0221 UTC 090206-0930 UTC 090206-1755 UTC
Good coherence TMI-AMSRE, problems with SSM/I => spatial resolutionEvolution of Gael 2009
AMSRE
AMSRE TMI TMI
TMITMI SSMI
SSMI
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N. Viltard et al, MT Overview, Hamburg, October 2010
The Megha-Tropiques Products
Kirstetter et al, 2010
Monsoon 2006 over Benin 1°x1° domain
Old retrieval database weights
BRAINTMI
vs. raingauges distribution comparison
New retrieval database weights
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N. Viltard et al, MT Overview, Hamburg, October 2010
The Megha-Tropiques products
Accumulated surface rainfall 1°x 1 day and associated error estimation;
TAPEER Algorithm fed from L2 BRAIN and GEO(Tropical Amount of Precipitation with Estimation of ERrors)
GSMAPTMPA TAPEER-BRAIN
Niamey AMMA 2006, filtered 3-5 days
Roca et al., 2010
Ground estimate
Satellite estim
ate
Agregated scale «L3/4»
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N. Viltard et al, MT Overview, Hamburg, October 2010
MT cal-val activities: phase I
NIAMEY August 2010
MIT Radar
X-Pol radar
RASTA 95GHz Radar
In-situ Microphysics
Algorithm validation
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N. Viltard et al, MT Overview, Hamburg, October 2010
MT cal-val activities: phase I
NIAMEY
MIT Radar: surveillance and aircraft guiding from ground
X-Pol radar
RASTA 95GHz Radar
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N. Viltard et al, MT Overview, Hamburg, October 2010
MT cal-val activities: phase I
NIAMEY
MIT Radar
X-Pol radar
RASTA 95GHz Radar
In-situ Microphysics
X-Port dual pol X-band Doppler: climatology of particlesClassification per system typesOperated Monsoon 2010-2012
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N. Viltard et al, MT Overview, Hamburg, October 2010
MT cal-val activities: phase I
NIAMEY
MIT Radar
X-Pol radar
RASTA 95GHz Radar
In-situ Microphysics
RASTA 95GHz radar (5 beams)
DopplerOn French Falcon 20
Characterization of M(D)
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N. Viltard et al, MT Overview, Hamburg, October 2010
MT cal-val activities: phase I
NIAMEY
MIT Radar
X-Pol radar
RASTA 95GHz Radar
In situ microphysicsOn French F20
PIP, CIP, FSSP...
M(D), N(D) etc...
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N. Viltard et al, MT Overview, Hamburg, October 2010
MT cal-val activities: phase I
Algorithm validationconsequences...
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N. Viltard et al, MT Overview, Hamburg, October 2010
The Megha-Tropiques mission
Summary
• Due to launch early 2011• Schedule :
– T0 -> T0+3 months: commissioning phase– T0+3 -> T0+9 months: cal/val period, reserved access to
PIs and CO-Is – T0+9 months: start of nominal functionning (open access
to L1 and start of NRT stream for L1 to specific partners)
• Dedicated Data policy for GPM under signature• Algorithm validation campaign w/ Dynamo ?• Product validation campaign Monsoon 11 & 12
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N. Viltard et al, MT Overview, Hamburg, October 2010
Thank you !
The Megha-Tropiques mission
http://meghatropiques.ipsl.polytechnique.fr
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N. Viltard et al, MT Overview, Hamburg, October 2010
SAPHIR : microwave sounder for water vapour sounding : 6 channels in the WV absoption band at 183.31 GHz. (cross track, 10 km)
•ScaRaB : broad band instrument for inferring longwave and shortwage outgoing fluxes at the top of the atmosphere (cross track scanning, 40 km resolution at nadir)
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
Payload (2/2)The Megha-Tropiques mission
Source: N. Karouche, CNES