NO JAVASCRIPT

This website requires JavaScript to function properly / Ce site a besoin de JavaScript pour fonctionner correctement

Aviso+
News
Image of the month
2014
Apr. 2014: Melting in the Kara Sea

Melting in the Kara Sea

Image of the Month - April 2014

Latitudinal profile of backscatter variability during winter (April) and melting (June) periods. In June, AltiKa sees the melting of the wetlands on the South and beginning of melting (water accumulation in valleys) in Yamal. Ob' estuary in June is still frozen, but ice transformation resulted to 10 dB drop of Sigma0 in June. In the Kara Sea, AltiKa shows well the fine spatial structure of ice cover (fast ice, polynyas, floes etc.) and allows the studying of its dynamics. (Credits Legos)

The area as seen by Modis (credits NASA MODIS project gallery)

The new altimeter, AltiKa, onboard Saral (CNES/ISRO) continues to bring its share of results and studies. The spatial resolution of AltiKa is better adapted to study land hydrology ; we had a look in July 2013 (Image of the Month, Jul. 2013: Ob bogs and wetlands) at the first measurements of this altimeter on the North of Siberia. Further North of the Ob river, the Kara Sea is also seen by AltiKa, and the finer resolution also enable to distinguish there the effects of ice melting and also the presence of polylinias (areas free of ice on a frozen sea). Clear differences are visible between winter (in this case, April, the satellite having been launched late February) and the onset of Summer (July), with the melting of land and sea ice.

Website on this subject:

Cryosphère satellitaire (Legos/CNRS) (in French)

News

Search.
Front-page news.
Image of the month .
- 2024 .
- 2023 .
- 2022 .
- 2021 .
- 2020 .
- 2019 .
- 2018 .
- 2017 .
- 2016 .
- 2015 .
- 2014 .
  - Dec. 2014: Sahelian dry and wet seasons seen by altimetry.
  - Oct. 2014: Better Mediterranean circulation.
  - Aug. 2014: The Agulhas current leaks.
  - July 2014: Groundwater from altimetry.
  - May 2014: Forecasting rivers.
  - Apr. 2014: Melting in the Kara Sea.
  - Jan. 2014: 35 years of altimetry!.
- 2013 .
- 2012 .
- 2011 .
- 2010 .
- 2009 .
- 2008 .
- 2007 .
- 2006 .
- 2005 .
- 2004 .
- 2003 .
- 2002 .
- 2001 .
- 2000 .
- 1999 .
- 1998 .
Press review.
Operational news and status .
News from CTOH .
Events calendar.

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+.

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.