Subtropical Gyre Drivers Explained

The subtropical gyre is a large system of rotating ocean currents, primarily driven by wind patterns.

Key Atmospheric Winds

• Equatorial Easterlies (Trade Winds): These winds blow from east to west near the equator. They exert a force on the ocean surface, pushing surface water predominantly westward.
• Subtropical Westerlies: Located north and south of the trade wind belts, these winds blow from west to east. They push surface water eastward in these regions.

Mechanism of Gyre Formation

The interaction between these opposing wind systems is crucial:

• The westward push of the equatorial easterlies near the equator and the eastward push of the subtropical westerlies at higher latitudes create a convergence of surface water towards the center of the gyre.
• This creates large, circular currents characteristic of subtropical gyres.

Therefore, the combination of equatorial easterlies and subtropical westerlies is the primary driver.