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Laboratoire d’Etudes en Géophysique et Océanographie Spatiales

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by Webmaster Legos last modified Jan 06, 2020 09:15 AM



Team leader: Etienne Berthier

Substitute: Sylvain Biancamaria


Research topics

The ECHOS team is studying the different components of the water cycle, from regional to global scales, and how they interact with climate variability and anthropogenic pressure in the context of global change. The team's research focuses on 3 main themes: 1) mass variations of glaciers and polar ice caps, 2) large-scale continental hydrology and the continental water cycle, and 3) sea level variations (observations, causes and consequences). From a methodological point of view, the close link between these three themes lies in the common use of satellite observations, based on altimetry, optical or microwave imaging, and gravimetry..


Research topicsDatabase
  • Cryosphère
  • Continental hydrology
  • HydroWEB
  • Sea level


Research areas

Combined with in situ observations and models output, remote sensing data is our favourite tool to observe key climate variables such as sea level, lake and river levels, mass balance of glaciers, ice caps and other important parameters such as freezing and thawing of water surfaces.

In interaction with other LEGOS teams and services, we study these phenomena and their societal implications. More specifically, our projects address several specific questions:

- How do the components of the land water cycle (storage and flux) vary from daily to decadal scales, from regional to global spatial scales? What are their links with climate variability and anthropogenic pressure?
- What are the recent mass changes in glaciers and polar ice sheets?
- How does global and regional sea level vary in time and what are the causes and impacts of these variations? How do continental waters influence the ocean in terms of sea level across the continent-ocean continuum?
- Can current and future changes in hydrological components and their possible links to extreme events, such as droughts or coastal flooding, be better characterized?


Use of satellite data

The team has developed a strong expertise in the use of satellite data. This specificity is reinforced by our activities:

- Calibration/validation of radar altimetry data on large ice surfaces, lakes and rivers, in order to correct and ensure consistency between the data from the various altimetry missions used since 1992.
- Development and maintenance of HydroWEB, an operational web-based service for lake and river level observation with satellite radar altimetry.
- Scientific support for the development of new space missions such as SWOT (Surface Water and Ocean Topography, CNES/NASA/CSA/UKSA)

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