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This APEX float was launched by French scientists - at 44.4°N, 8°W on 6 December 2006. It has recorded a total of 210 profiles, and made its last report on 25 September 2012 from 31.3°N, 33.1°W.
For a few months after launch the float drifted with currents towards the northwest, before it turned and moved southwards past the Azores. The Mercator temperature and salinity maps from early 2007 (right) may give a clue to explain the early drift to the North. They show how warm and salty Mediterranean water spreads from the Strait of Gibraltar into the North Atlantic.
The copepod Calanus helgolandicus (left) is a 'Lusitanian' species, while C. finmarchicus (right) lives in cooler northern water.
Some of this Mediterranean water flows north along the coast of Portugal, across the Bay of Biscay, and on along the western coast of Ireland and Scotland. This flow forms a 'slope current', 10-20 km wide and only a few hundred metres thick, which moves northwest along the continental slope.
Sometimes this Mediterranean water comes to the surface west of Scotland, and may even flow on to the Scottish continental shelf, bringing Mediterranean or other warm-water 'Lusitanian' plankton (microscopic plants and animals) to the coasts of the Hebrides or Sutherland. Can you spot this Mediterranean water in the temperature and salinity profiles below?
Profiles of temperature (left) and salinity (right) from Argo float 1900622. The profiles show how temperature (T) and salinity (S) change with depth from the surface to 2000m. Early profiles are dark blue, the latest profiles are deep red or brown. Click on the images for larger plots. Source of plots: IFREMER/Coriolis.
Time series of temperature (left) and salinity (right) from Argo float 1900622. The sections show all the temperature (T) and salinity (S) profiles measured by the float during its life-time side by side. Each profile is represented by a very thin column where deep red is the highest values and deep blue the lowest. The colour bars on the right relate the colours to actual data values. Profile numbers are given along the top of the plot, with corresponding measurement dates along the bottom. Click on the images for larger plots. Source of plots: IFREMER/Coriolis.
Look at the float trajectory in Google Earth to see where the float has been. (If in doubt about how to reveal the float tracks, see our Google Earth screenshot for help.) Compare this to the maps of temperature and salinity for different depths available for example from Mercator ocean analyses.
The Argo Information Centre has more information about this float. You can also download the data from one of the Data Centres - just select Data > Data Downloads.
There are many different formats available. ASCII data can be viewed in spreadsheets such as Excel. The other data types may require more specialist software.