Mobile version

Missing: water

Image of the Month - December 2012

Western Siberia is home for some of the most extensive river systems that drain into the Arctic Ocean, including the Poluy, Nadym, Pur and Taz rivers, in the North. The flat relief of the region creates a multitude of rivers, lakes, wetlands, mires, etc. covering 35 to 70 % of the surface, and part of the region is affected by permafrost. This makes it especially sensitive to climate changes.

Satellite radar altimetry enables to estimate the extent and variability of flooded and wet zones. The two flood seasons are well observed (spring flood linkd to ice melt and summer-autumn rain flood).
However, one of the curiosity of the region is that at least 30% of the water from the precipitations is not found in the river run-off during the floods. It is supposed that it is stored in the wetlands and either run off slowly or evaporate (the large surface of waters increase evaporation). But this rate increase... up to 50-60% during the 2000s are thus not found in the run-off. At the same period the air temperatures have increased, which leads to suspect increased evaporation. But other things are probably contributing: change in vegetation, permafrost, etc. Infrastructures and fires can also have an impact.


See also:

Website on this subject:


  • Zakharova, E. A., Kouraev, A. V., Kolmakova, M. V., Mognard, N. M., Zemtsov, V. A. and Kirpotin, S. N., 2009: The modern hydrological regime of the northern part of Western Siberia from in situ and satellite observations,International Journal of Environmental Studies,66:4,447 — 463. DOI: 10.1080/00207230902823578
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!