Two thermal infrared images of a beach

Two thermal infrared (TIR) images of a submarine groundwater vent site off west Maui showing the influence of tides on the spatial extent of submarine groundwater discharge. Top, Image taken at high tide. Bottom, Image taken a low tide. The thermal range (20–30°C) on the right displays warmer temperatures as lighter shades of gray and cooler temperatures as darker shades of gray. Note that the extent of warm submarine groundwater discharge close to shore is greater at low tide than at high tide. The bright dot just to the left of the cross-hair is a buoy atop one of the thermistor moorings (see view looking from boat to shore, left), which is warmer than the seawater.