Figure 4
A schematic diagram of the evolution of the dye patch in the BBL at the foot of the shelfbreak front. The cross-shelf temperature profile is a mean derived from all sections taken during the cruise and is used to infer cross-shelf position relative to the front from temperature measurements. The position of the dye peak (dots) and approximate one standard deviation width of the patch for each survey are shown along with the time elapsed from the dye injection. The vertical gradient above the BBL at x=0 is from the dye injection measurements. Height of the BBL (dashed line) is defined by the height of the maximum vertical temperature gradient. Arrows qualitatively represent the flow although only the onshore flow is actually measured by the dye patch displacement. Isotherms are hand drawn to connect the mean BBL temperature with the vertical stratification at x=0 and to represent the cross-shelf variation in the vertical gradient. Between TR3 and TR4 the entire frontal boundary was displaced 12-15 km onshore.

Designed by: D. Jarvis Belinne
Lamont-Doherty Earth Observatory of Columbia University