Which phenomenon causes significantly cooler surface water temperatures during coastal upwelling events?

💡 Explanation

When upwelling occurs, deep, cold water rises because density gradients are disrupted, carrying dissolved nutrients. The latent heat absorption by evaporation causes surface water to cool as the cold water evaporates, absorbing heat. Therefore, lower temps result rather than adiabatic expansion, kinetic dissipation or albedo increase, which have different mechanisms.

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