Mobile version

Discovering a current in the 21st century with altimetry

Image of the month - April 2007

Ocean currents can be discovered in the 21st century: oceanographers found a current, the South Indian Counter Current, looking closely at altimetry data. This surface current, which goes eastwards from Madagascar at about 25°S is the counterpart of a westward current closer to Equator. If it can't be seen at every time, averaging current velocities in the region shows it clearly.

Altimetry measurements represent a huge quantity of information on the ocean (a Topex/Poseidon 10-day cycle gathered more measurements than the previous 100 years of in situ measurements). Continuity of these measurement over long period will bring to light new phenomena, not very proeminent on instantaneous views, but that show up over longer periods.

See also :

Websites on this subject :

Reference :

  • Siedler, G., M. Rouault, and J.R.E. Lutjeharms, 2006: Structure and origin of the subtropical South Indian Ocean Countercurrent, Geophys. Res. Lett, 33, L24609, doi:10.1029/2006GL027399
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!