How do ocean currents such as the Gulf Stream change sea-surface temperatures?

Ocean currents like the Gulf Stream significantly alter sea-surface temperatures by transporting warm water from tropical latitudes toward the poles, effectively exchanging heat between different regions.12

By moving this warm, saline water into higher latitudes, the Gulf Stream creates sharp temperature gradients, or thermal fronts, where it encounters colder water flowing southward from polar regions. These boundaries result in marked differences in sea-surface temperatures over relatively short distances. For example, in winter, the Gulf Stream can maintain surface temperatures significantly higher than those of adjacent waters, such as the colder continental slope waters found to its northwest.13

Furthermore, these currents influence the atmosphere by transferring heat and moisture, which in turn affects regional climate patterns. The presence of these warm currents can displace surface isotherms from their expected latitudinal positions, preventing the ocean from simply reflecting the solar radiation balance of a specific latitude. Through these mechanisms, the Gulf Stream and similar currents act as a primary driver of heat distribution across the Atlantic Ocean.4215