Figure A-3: Fluorescence Measurements of Microlayer Enrichment

Microlayer and bulk water samples taken from laboratory tank containing artificial seawater.

Left: No CA added to tank, Middle, Right: 4mg l^-1 CA added to tank,

Right: after air bubbled through tank water. The thin bars show the effect of adding an extra 20nM CA spike to each sample. Fluorimeter sensitivity10.

Red = no DA, Green = 0.78mM DA added, Blue = 3.9mM DA added.