The Pacific Ocean is the largest and oldest body of water on Earth. The North Pacific is characterized by the general clockwise rotation of the North Pacific gyre, which is driven by trade winds. Spatial variations in tradewinds result in cooler air temperatures in the western North Pacific and milder air temperatures in the eastern North Pacific (i.e., Subartic Pacific). Iron is supplied to the North Pacific by dust storms that occur in Asia and Alaska as well as iron-rich waters advected from the continental margin, sometimes by eddies such as Haida Eddies.