Mobile version

Wave model with ice

Image of the Month - January 2017

Wave model errors depending on whether you take icebergs into account (bottom) or not (top). Taking icebergs into account to compute waves enables to lower the model error in the Southern Ocean (Credits Ifremer)
Mean monthy ice volume distribution (1992-2014) as computed from altimetry (Credits Ifremer)

 

The Southern ocean high waves are almost a cliché. Even if the highest waves may not be detected there (but rather in the North Atlantic), this Ocean has often very rough sea states. One of its other pecularities is the presence of icebergs, threatening navigation too. Since there's few in situ measurements in the region, satellite observation and modelling are of a particular importance there.

Wave models, which modelize wave heights and directions, did not take into account icebergs at first. But when iceberg distribution maps (from altimetry) were released, biases in wave models and iceberg distributions looked strangely alike... Investigations showed that icebergs are dampening waves, in fact. So, if you don't take them into account, you modelize waves even higher than the actual ones in the iceberg areas.
Altimetry can help for both subjects - significant wave height measurements and iceberg detection. With the CFOSat mission (CNSA/Cnes), a dedicated wave-measurement instrument similar to altimeters will be launched (planned 2018).

See also:

Other website on this subject:


EnglishFrançaisEspañol
Rss feedsContactSitemapPartnersFAQGlossaryLexiconMobile
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

The new 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!