Mobile version

The new challenge

P.Y. Le Traon (CLS, France)

TOPEX/POSEIDON data is now routinely available:
the data is validated and distributed to the scientific community within a month of being gathered. More than 650 days of data-65 cycles-have been made available. Verification has now fortunately given way to scientific interpretation.
This third AVISO Newsletter is therefore mainly about scientific applications of the TOPEX/POSEIDON mission.

 

Some of the results you can read about are spectacular. Thanks to TOPEX/POSEIDON we have monitored the current El Niño event and equatorial wave activity and observed the long-wavelength variability of the ocean for the first time. Mean sea level can be measured to within a few millimeters! TOPEX/POSEIDON data, combined with in situ measurements from TOGA and WOCE or assimilated in numerical models, can also yield accurate descriptions of 3D circulation. The extraordinary accuracy of TOPEX/POSEIDON measurements is taking us significantly further in our knowledge of the ocean and its role in the climate.

Those of us working on AVISO must also go on working to improve data quality, and more generally the service to users. This will mean constant interaction with the scientific community. We know, for example, that ocean tides are the main source of error in TOPEX/ POSEIDON measurements, but also that TOPEX/POSEIDON can estimate them to centimeter accuracy. The new tide models from AVISO will considerably improve data quality. The purpose of CLS validation includes enhancing data quality and advising users on how to use the data.

But it's already time to look ahead. Satellite altimetry is an essential component of the long-term ocean observing system now being set up. We will soon need homogeneous, validated data from the different altimeter missions. The new challenge is a multi-mission processing system. The pilot experiment on ERS-1 and TOPEX/ POSEIDON data is a start. It means a lot of work, but there's no way around it. By year 2000, we need to be able to homogeneously process data from TOPEX/POSEIDON, ERS-1, ERS-2, Envisat, Geosat Follow-on and TOPEX/POSEIDON Follow-on. We also need to provide scientific users with more sophisticated, directly useable products, such as for operational assimilation in models. We must also promote the use of altimetric data for non-altimetry specialists, such as the broad oceanographic community. This is one of the objectives of the Centre for Earth Observation (CEO) being set up in Europe. The new challenge is for the whole oceanographic community.

EnglishFrançaisEspañol
Rss feedsContactPartnersFAQLexiconMobile
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!