Water samples were collected using the ship's CTD profiler and 12 L Nisking bottles. 10 L water samples from each depth were then transferred into 5 gallon polycarbonate water bottles and extractrated. 10 L seawater samples were collected at 200 m depth intervals and then solid-phase extracted suing Agilent Bond Elut PPL cartridges (1 g, 6 ml). The organic matter was then eluted with 10 mL methanol. The methanolic extract was diluted 1:20 and directly infused into a 12 Tesla Bruker Solarix Fourier transform ion cyclotron resonance mass spectrometer. 500 scans were averaged and mass lists were calibrated at a mass accuracy of greater than 0.2 ppm.