Ocean currents are large-scale, persistent movements of seawater driven primarily by wind stress, density gradients (thermohaline circulation), Earth’s rotation, and basin geometry. They form interconnected surface and deep circulatory systems that redistribute heat, salt, nutrients, and dissolved gases across ocean basins. Major surface currents, organized into gyres, are largely wind-driven and Coriolis-deflected, while deep currents follow density-controlled pathways linked to water mass formation at high latitudes. Ocean currents modulate regional and global climate, influence marine biogeochemical cycles, and are central to coupled ocean–atmosphere dynamics represented in numerical circulation and climate models.
A new study analyzed nearly four decades of deep ocean observations to reveal significant cooling and freshening of deep water in the Subtropical North Atlantic. The results suggest that warmer, saltier deep waters observed ...
Earth Sciences
Mar 26, 2025
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98
Mesoscale eddies, oceanic gyres about 100 kilometers in diameter, are ubiquitous features of the global ocean and play a vital role in marine ecosystems. Eddies, which form in biologically productive coastal upwelling regions, ...
Earth Sciences
Mar 25, 2025
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24
Between Hawaii and California, trash swirls in giant ocean currents, caught up in the infamous, Texas-sized Great Pacific Garbage Patch. This is just one of many found across the globe. Efforts to clear the patch with sweeping ...
Earth Sciences
Mar 18, 2025
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47
The Great Atlantic Sargassum Belt has puzzled researchers since 2011. A recent study published in Nature Communications may have identified what drove a tipping point that established the phenomenon in the tropical Atlantic ...
Environment
Mar 13, 2025
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