Eastern Boundary Currents are defined oceanographically by coastal upwelling and wind-driven dynamics that bring deep, cold water to the surface, making this relationship a matter of basic definition and common observation in oceanography.
The claim that 'Upwelling and coastal winds make Eastern Boundary Currents cold' is a statement of fundamental oceanographic definition and basic physical geography. Papers like [3] and [7] explicitly reiterate this foundational premise ('Eastern Boundary Upwelling Systems are regions where wind-driven coastal upwelling brings deep cold, nutrient-rich water to the surface') as established background rather than contested hypotheses. Therefore, this is classified as common knowledge requiring no citation.