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Laboratoire d’Etudes en Géophysique et Océanographie Spatiales

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by LEGOS — last modified May 04, 2015 01:41 PM


The "Space Geophysics, Oceanography and Hydrology", GOHS team's research activities are devoted to using space geodesy techniques for studying the Earth's system (solid Earth and surface fluid envelopes): gravitational field and temperal gravity variations, global deformations of the Earth, horizontal and vertical movements of the Earth's crust, sea level variations at global and regional scales, large-scale continental hydrology.

Over the past five years, the team's research work has focused on:

Determining seafloor topography by satellite altimetry. Applications to marine geophysics.

Space positioning using the DORIS, Laser and GPS systems and applications to tectonic plate movements and vertical motions of the Earth's crust.

Measuring temporal variations of the gravity field from space gravity data provided by GRACE..Applications land hydrology, oceanography and ice sheets mass balance.

Study of the mean sea level (global and regional scales): . Observation from tide gauge measurements and satellite altimetry; analysis of climate causes: thermal expansion of oceans, exchange of water masses with continental reservoirs and ice sheets.
--> Maps and data

Continental hydrology using space observation: measuring water level fluctuations of continental lakes, major rivers and flood plains by satellite altimetry, measuring fluctuations in water storage in soils, underground reservoirs and snow pack by space gravimetry and link with climatic variability and anthropic effects.
--> Maps and data




Space observations Parameters measured
Satellite altimetry: Topex/Poseidon, ERS-1,
ERS-2, Jason-1, Envisat, GFO
Space gravimetry: GRACE
DORIS, Laser,GPS techniques
Gravitational field and its spatio-temporal variations
Deformations of the Earth's crust
Water levels of lakes, rivers and flooded plains
Variations in continental water stocks
Mass balance of polar ice sheets
Sea level change

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