Towed hydrocast (tow-yo) at NW Rota #1 Submarine Volcano (14° 36' N) on February 12, 2003. A) Bathymetric map with tow line of hydrocast in white. B. Hydrothermal plume above volcano as delineated by optical backscatter. The black saw tooth pattern is the track of the CTD-rosette package as it passed over the volcano. The stair step features in the track are the locations where samples were taken. ΔNTU= nepelometric turbidity units above ambient seawater.
