Mobile version

Doris sees the seasons weighing on the Earth

Image of the month - May 2000


Pressures on the Earth's surface cause it to move it out of shape in much the same way as a ball does when pressed. Pressures are exerted by the weight of the atmosphere and by snow cover, soil moisture, ocean water masses, and other forces. The Doris precise orbit determination and positioning system detects the resulting small crustal motions of no more than a few millimeters. In particular, it enables us to observe seasonal variations, due for example to snow (Metsahovi) or ocean water masses (Tristan da Cunha).

Doris is one of three orbit determination systems on the Topex/Poseidon satellite, and will fly on Jason-1 and Envisat in the near future. It is also onboard the Spot Earth observation satellites (Spot 2 and 4, and soon on Spot 5). The Doris system is a valuable tool for altimetry, its extreme accuracy making it possible to observe small-amplitude ocean phenomena, and for geophysics applications, where it allows us to detect even the tiniest motions of the Earth.

For further information :

Mangiarotti, S., A. Cazenave, L. Soudarin, J.-F. Cretaux, 2000: Annual vertical crustal motions predicted from surface mass redistribution and observed by space geodesy, J. Geophys. Res. (submitted).


Websites on this subject:

Rss feedsContactPartnersFAQLexiconLegal noticePersonal Data Protection PolicyMobile
You must enable cookies in your browser preferences to save the modifications
You are using an older version of Internet Explorer, please update to take full advantage of Aviso+ features

Customize the home page

View all widgets
Reduce display
Public profile
User profile

Select/Deselect widgets

Discover AVISO+

Customizable home, reading tools, products search guide, etc.. Discover step by step the features of the new site AVISO+.

Customizable homepage

This home page is composed of blocks called "widgets".

Rearrange the blocks with a "Click & Drop".

Hide a widget with the cross at the top right. Reset or add a widget with the "wrench" icon. The "User" and "Public" profiles offer a predefined organization.

All the modifications are automatically saved as cookies on your machine so as to enable you to have your own specific AVISO+.

Reading tools

Ease your reading by choosing the page background colour (black/white) and/or by modifying the font size.

Browsing menu and breadcrum trail

To ease your browsing through AVISO+, you can use at any time the main banner items with the interactive submenus or use the browsing menu on the left side of the screen (it is open by default). For more readiness of the page contents, you can fold and unfold the browsing menu by clicking on the tab. At any time you can know where you are thanks to the browsing menu or the breadcrum at the top of the page.

Products search guide

The first submenu of the "Data" banner item leads you to a new search form enabling you to find quickier the product that suits your needs. The list of results is updated according to your selection criteria.

AVISO+ Multimedia

The first submenu of the "Multimedia" banner item leads you to AVISO+ collections of images and videos linked to altimetry and its applications. Have a nice visit!