Which outcome occurs when increased glacial meltwater disrupts North Atlantic gyre circulation salinity gradient?

💡 Explanation

When glacial meltwater increases, the North Atlantic's salinity concentration decreases, weakening the thermohaline gradient that drives the gyre because density differences become less pronounced, diminishing the strength of the Atlantic Meridional Overturning Circulation (AMOC). Therefore, slower heat transport to Europe results, rather than upwelling change, nutrient shifts, or phytoplankton increases which depend on different mechanisms.

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