Mobile version

A new Mean Dynamic Topography released

Image of the Month - March 2022

The new Mean Dynamic Topography (MDT CNES-CLS 2022) plotted over the Arctic regions, where many improvements were done (Credits CNES/CLS, figure Aviso)

When using altimetry, we are working most of the time with height variations (aka sea level or sea surface height anomalies) or with heights with respect to a reference ellipsoid. The mean currents are in the mean sea surface which can be computed by using years of altimetry data with respect to the ellipsoid, but this surface also includes the geoid. And, for a long time, the geoid was not well known. Now, with dedicated gravimetry missions, it is better defined. Moreover, another approach can be used: measuring the surface currents using drifting buoys, to compute their mean flow. Or the two approaches can be combined, removing the geoid from the altimetry mean sea surface as a first step, then refining the result using the in situ data for finer details. Close to the North American Atlantic coasts (Mid Atlantic Bight), adding high frequency radar measurements have been tested. 

Twenty years have gone since the first Mean Dynamic Topography dataset disseminated through Aviso. The new CNES-CLS22 MDT is now available for use. 

See also:

Reference:

  • Jousset S., S. Mulet , J. Wilkin, E. Greiner, G. Dibarboure, N. Picot, 2022, New global Mean Dynamic Topography CNES-CLS-22 combining drifters, hydrological profiles and High Frequency radar data, OSTST 2022, Venice, https://doi.org/10.24400/527896/a03-2022.3292
EnglishFrançais
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!