Mobile version

Gas in the water

Image of the month - August 2002

CO2 transfer velocity between the atmosphere and ocean for February (top) and September (below) (temperature-related effects have been removed). Absorption of CO2 by the ocean is faster in winter (Northern or Southern). (Credits WHOI).

One of the major unknowns in modeling climate variations is the estimated CO2 content in the atmosphere and absorption of CO2 by the ocean. Here again, satellite altimetry can help. This time it is not measurements of actual sea surface height that interest us, but what the received radar signal can tell us about surface reflectivity. CO2 absorption increases with sea surface roughness. A rough sea surface also causes reflected radar waves to scatter more, meaning that the return signal received by the altimeter is weaker.
Sea surface conditions depend on wind and on many other factors, such as the presence of a surfactant film. CO2 absorption varies seasonally.

 

 

CO2 velocity transfer varies with latitude (a). It is very low at the Equator, slightly higher in the Tropics, and higher at latitudes above 30° in the Southern Hemisphere than in the Northern Hemisphere (where there are more continental land masses).
It also varies from one year to another (b).
(Credits WHOI)

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!