TOPEX and JASON SPACEBORNE ALTIMETERS. Jean PLA CNES, Toulouse, France. Summary. Scope of a spaceborne altimeter Frequency plan for TOPEX and JASON Usage of the data Data Assimilation and forecasting. Topex -Jason Mission Objectives: Scope of a spaceborne altimeter.
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TOPEX and JASON SPACEBORNE ALTIMETERS
CNES, Toulouse, France
Scope of a spaceborne altimeter
Frequency plan for TOPEX and JASON
Usage of the data
Data Assimilation and forecasting
similar to in-flight T/P ones
7 Dec. 2001
TOPEX/POSEIDON (1992) ; JASON-1 (2001) ; JASON-2 (2007-2008)
Services: Aeronautical Radionavigation
Fixed Satellite (Earth to Space): feeder links of non- GSO satellites in the mobile satellite service
Altitude = 1344 km, beam footprint = 77 km
This instrument collects the natural emission by the ground surface and in the atmosphere at three different (18, 21 and 37 GHz) frequency bands. The goal is to determine the water vapour content and in liquid water in the atmosphere, when combining the whole set of measurements within those bands. Therefore, it is possible to know the correction to be applied to the altimetric measurement. ( NASA)
Alt. Instr. error
From GEOS-3 to Jason-1
Error budget of altimeter missions
El Niño/La Niña as seen by TOPEX/Poséidon (NASA/CNES)
Towards an integrated, multi-parameter approach of
ocean modelling and operational forecasting
OCEAN : turbulent & chaotic medium
Integrated approach necessary with :
French initiative : MERCATOR
Process similar to weather forecast
The MERCATOR mission was defined in 1996 by six partner organizations. The project is pursuing three goals:
Mercator Users :
Modelisation & Assimilation
Observation : Satellite & In situ
TOPEX, JASON, ...
Altimetry & Oceanography - Operational Organization
Assimilation, forecast :
Altimetry missions :
Jason, ENVISAT, DORIS/SPOT
Other space data
In situ Data: ARGO, CORIOLIS
"See without being seen"
"Find the most economical route"
"Interesting structures to study"
Altimeter product from T/P and ERS-2
for fisheries in the Indian ocean
MERCATOR : future activities
The MERCATOR mission seeks to develop and deploy a truly operational oceanography system over the next five years capable of analyzing and predicting ocean conditions around the globe : the Centre for Operational Oceanography (C2O)
This system will describe and predict ocean conditions over the whole ocean column continuously and in real time, at scales ranging from global phenomena to regional areas.