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CONTOUR PLOT OF TEMPERATURE - The multi-colored lines represent temperature measurements taken on ascent during individual dives by the glider.
The black lines are contours of constant temperature(isotherm). Where contours are close together, the temperature of the water is changing rapidly, known as a thermocline.
The abscissa (x-axis) is the distance along the glider track. The ordinate (y-axis) is pressure, or depth, where 1 dbar of change is approximately 1 meter.
The deepening of isotherms between 400 and 500 kilometers distance is caused by the crossing of the Gulf Stream. The rapid change at the surface at 400 kilometers is the "northern wall" of the Gulf Stream. This can also be seen in the temperature maps.
Blue and purple colors indicate colder water. Red and orange colors represent warmer waters.