Which process weakens the North Pacific Subtropical Gyre's circulation?

💡 Explanation

When Artic sea ice melts, increased freshwater input reduces the density gradient because denser water sinks, affecting the gyre's thermohaline forcing that drives circulation strength. Therefore melting sea ice weakens gyre circulation, rather than increasing it (wind intensification, salinity) or through surface divergence due to Coriolis force.

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