Mobile version

North Atlantic Tides

Image of the Month - July 2010

Amplitude of tides from a model along the East Atlantic coasts. The two images are set 6 hours apart (the semi-diurnal tide is the major one there). The corner between the Cotentin peninsula and Brittany shows especially high variations. 
See the animation over 10 days (mpeg4, 1.8 MB), one image every hour between January 17, 2006 0h and January 26, 2006 23h (Credits Legos/Cnes/CLS)

Mont St Michel bay, in North-West France, in known for its impressive tides (the highest recorded after the Bay of Fundy in Canada). The whole English Channel, in fact, is a very special area for tides. Tides is one of the oldest ocean phenomena studied and predicted, due to its importance for harbour operations, and the clear link to the Moon phases it exhibits.

Altimetry both benefits from tide models and helps improve them. Altimetry measurements need to be corrected from the tides to set apart other interesting ocean variable phenomena (eddies, El Niño, general ocean circulation...). The tide correction is indeed one of the strongest geophysical correction of altimetry, with an amplitude of several meters in some regions. Global tide models (like GOT, or FES) are commonly used as a reference for tide correction in the altimeter data: those models have now an accuracy of about one centimeter in open ocean. However, significant errors remains in shallow waters and in polar regions, due in particular to sea ice effects. The use of very high resolution data and regional bathymetry among other things allows the development of regional models, with a better accuracy.

On the other side, the height measurements made by altimetry provides significant tidal information at aT global scale (in the open ocean and up to a few kilometers from the coasts) and thus enable to improve tidal models.

See also:

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!