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 Sea Ice circulation in the north pole
For several years the CERSAT has been providing sea ice maps derived from various scatterometers (microwave radar) on board earth observation satellites (ERS-1, ERS-2, ADEOS-1 or QuikSCAT). This instruments initially designed for measuring winds at the ocean surface allow to detect both the edge of the ice pack and the nature of the ice which it is made of (first-year, old ice, ...). A correlation analysis technique between successive maps…
2007 Arctic sea ice melting : new record
The month of September of this International Polar Year is marked by a record : Arctic sea ice has hit its lowest value since the beginning of satellite observations exist (almost 30 years).
2012 Arctic sea ice melting reached a new record
Following the downward trend of recent years, the area covered by sea ice in Arctic has reached its lowest value since satellite observations began at end of the 1970’s.
Waves are being measured over the whole surface of the ocean by ESA satellite ENVISAT. Before being assimilated operationaly in forecasting models, the ENVISAT/ASAR wave data have to be fully calibrated and validated. In order to make this task easier, CERSAT is providing users with colocated datasets of ASAR (onboard ENVISAT) cross-spectra and wave spectra with in-situ measurements (wind, waves, sst) from various buoy networks. Envisat ASAR Wave mode products…
Altiberg : a database for small icebergs
We now provide a new database which contains the small iceberg (<3km in length) detected by altimeters using the high resolution waveforms. The level 2 products are the individual detected iceberg files (in matlab or netcfdf). The level 3 product contains antarctic polar sterographic 100 km resolution grids of monthly volume of ice, probability of presence of icebergs and mean iceberg area. The database is also available for other several…
CERSAT to release new satellite global mean wind fields
Extending the dataset set up with ERS-1, ERS-2 and NSCAT series, CERSAT provides the scientific community with easy-to-use synoptic gridded fields of wind-related parameters (speed and stress vectors), estimated from observations by NASA scatterometer SeaWinds onboard QuikSCAT. They are provided with three time resolutions - daily, weekly and monthly averages - on a global 0.5°x0.5° resolution grid, since July 1999. The data are available in netCDF format and quicklook pictures…
Chlorophyll evolution in the subtropical gyres
Because of weak inputs of nutrients in the surface mixed layer, chlorophyll concentration always remains low in the subtropical gyres. These weak inputs of nutrients are due to the downward Ekman pumping and to the deep nutricline. The now available decade of satellite sea colour data gives us the opportunity to follow the evolution of the chlorophyll concentration on these poorly-cloudy areas.
End of ERS-2 mission after 15 years
ERS-2 was de-orbitated on 6th July, ending a 15 years long mission of earth observation. For us, this was also the celebration of the 20 years of CERSAT initially created and funded in support to ERS mission.
ESA Living Planet Fellowship: research fellowship funding announcement
ESA has just opened the call for new post-doctoral research fellowships called The Living Planet Fellowship. These concern fellowships in the host institute, funded up to 70% by ESA.  The deadline for for applications is 30 June. Detailed information, call procedure and limitations, deadlines and more can be found at  
First validation results on JASON-1 altimeter
JASON-1 is a new franco-american altimeter launched in December 2001. Using the colocated datasets distributed at CERSAT, here is a first estimation by Pierre Queffeulou (IFREMER/CERSAT) of Jason data quality from comparisons with other altimeters as well as in-situ (buoys) measurements. This study focus on wind and significant wave height measurements provided by this instrument. They are inter-compared with similar observations by ERS-2 and GFO altimeters.
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