Data for Perceval,16/05/2007 to 22/05/2007
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Date	Hour	Latitude	Longitude
22/05/2007	22:31:00	71.353	-51.078
22/05/2007	21:59:00	72.567	-51.104
22/05/2007	17:21:00	71.914	-50.634
22/05/2007	14:24:00	71.082	-50.801
22/05/2007	12:41:00	71.162	-50.971
22/05/2007	11:12:00	71.007	-51.009
21/05/2007	22:50:00	71.165	-50.954
21/05/2007	20:27:00	71.164	-50.957
21/05/2007	17:35:00	71.213	-50.986
21/05/2007	13:04:00	71.193	-51.007
21/05/2007	12:14:00	71.159	-51.266
21/05/2007	11:18:00	70.203	-51.103
21/05/2007	08:48:00	71.453	-50.958
21/05/2007	00:55:00	71.402	-50.958
20/05/2007	21:25:00	71.331	-51.002
20/05/2007	16:22:00	71.256	-50.979
20/05/2007	09:04:00	71.476	-50.913
20/05/2007	04:13:00	71.352	-51.017
20/05/2007	00:55:00	71.448	-50.956
19/05/2007	23:34:00	71.37	-50.94
19/05/2007	20:49:00	70.506	-51.3
19/05/2007	19:59:00	71.516	-51.032
19/05/2007	19:08:00	70.905	-50.578
19/05/2007	15:37:00	71.577	-50.86
19/05/2007	15:07:00	71.334	-51.1
19/05/2007	13:59:00	71.228	-51.055
19/05/2007	12:09:00	71.376	-50.974
19/05/2007	10:00:00	70.594	-50.964
18/05/2007	23:27:00	71.37	-50.941
18/05/2007	20:05:00	71.346	-50.911
18/05/2007	18:46:00	71.375	-51.004
18/05/2007	13:32:00	71.262	-51.267
18/05/2007	12:33:00	71.404	-50.951
18/05/2007	03:21:00	70.933	-50.757
18/05/2007	00:25:00	71.406	-50.859
17/05/2007	21:07:00	71.44	-50.864
17/05/2007	17:46:00	71.381	-50.862
17/05/2007	13:47:00	71.969	-50.871
17/05/2007	11:32:00	71.263	-50.861
17/05/2007	03:46:00	71.228	-50.995
16/05/2007	23:07:00	71.354	-50.859
16/05/2007	22:13:00	71.696	-50.947
16/05/2007	21:22:00	70.848	-51.064
16/05/2007	20:32:00	71.289	-50.864
16/05/2007	18:00:00	71.466	-50.954
16/05/2007	17:12:00	71.4	-50.888
16/05/2007	11:53:00	70.718	-50.914
16/05/2007	10:40:00	71.351	-50.884
16/05/2007	02:24:00	71.331	-50.81
16/05/2007	00:02:00	71.347	-50.816

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Bathymetry

This map shows the water depth (a negative relief of the sea floor). It is measured by oceanographic research vessels or calculated from satellite data 'altimetry'.

Surface temperature

Seawater surface temperatures are either measured by buoys, satellites or calculated from ocean forecast models like Mercator.

Water colour

The phytoplankton is the 'plant part' of the plankton (microscopic cells living and drifting in the water column), which constitutes the first member of the food chain. The presence of this phytoplankton changes the colour of the seawater, because it contains chlorophyll. This is the pigment responsible for the green colour of all plants on earth. Measuring the quantity of the phytoplankton is crucial for understanding marine ecosystems. The instruments carried by satellites, which measure the ocean colour, depend on the actual weather: When the sky is covered by clouds the maps show white zones here and there, where the measurements were blocked.

Surface winds

Wind is one of the elements that directly moves the buoys, but also drives the surface currents. They can be measured by especial instruments or calculated from the meteorological forecast models like the one from 'Météo-France'.

Salinity

The quantity of salt present in seawater represents an important information: The saltier the water, the higher the density; and this plays a role in oceanic water circulation. Salinity can be measured by the buoys, inferred from other measurements or even be calculated from ocean forecast models like Mercator. It is given in 'psu' (practical salinity unit), i.e. the salt in grams per 1000 grams (1kg) seawater.

Geotrophic currents

The geotrophic currents are the ones calculated from the topography of the ocean (hence altimetry measurements): The steeper the decline, the stronger the perpendicular currents along the decline.

Surface currents

The surface currents are calculated from the geotrophic currents and from the winds on the ocean’s surface as well as derived from ocean forecast models like Mercator.

Mean ocean topography

The 'permanent relief' of the ocean's surface results from the major currents. This 'mean ocean topography' is calculated from measures taken by satellites equipped with 'altimeters', by satellites measuring the gravity and measurements directly taken in the sea (called 'in situ' measurements).

Ocean topography

The relief of the ocean's surface comes from the currents and their variations. For example, ocean eddies forming either the 'dells' (cold water eddies) or the 'humps' (warm water eddies) of this relief, can be observed.