Quirks & Quarks

Can large underwater volcanoes increase ocean temperatures? Quirks Question

Volcanic eruptions on the ocean floor have a minimal effect on water temperature and are unlikely to contribute to global warming.
An underwater eruption in the southern ring of fire, south of Japan (NOAA)
Listen2:45

Volcanic eruptions that occur underwater have a minimal effect on the temperature of the oceans.  Dr. May Ver, a lecturer in the Department of Earth, Ocean and Atmospheric Sciences at the University of British Columbia says that the volume of ocean water above the volcano has a cooling effect.   It would take an extremely  large eruption to make a difference, but those are very rare.  Sub-marine eruptions are also unlikely to release CO2 to the atmosphere and contribute to global warming.