Ocean surface heat is at record-breaking levels. Temperatures began climbing in mid-March and skyrocketed over the course of several weeks, leaving scientists scrambling to figure out exactly why. Temperatures have fallen since their peak in April as they naturally do in the spring but they are still higher than they have ever been on record for this time of year. Gregory C. Johnson, an oceanographer at the National Oceanic and Atmospheric Administration, which calculates the ocean surface temperature using a network of ships, buoys, satellites and floats said that it is remarkable.