An example of a detailed near-bottom ABE survey. At the Endeavour segment of the Juan de Fuca Ridge, ABE detected increases in water temperature over several known vent sites (right), and variations in the vertical velocity of vent discharge at the same locations (left). From these measurements the amount of heat emitted by the vent field can be calculated. We plan to make similar measurements for CO2 at Brothers. Image courtesy of New Zealand American Submarine Ring of Fire 2007 Exploration, NOAA Vents Program, the Institute of Geological & Nuclear Sciences and NOAA-OE.