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The magnetic susceptibility (concentration of magnetic minerals) and S ratio (relative abundance of low-coercivity magnetic minerals) of the five pelagic-clay cores have decreased synchronously since about 2.5 Ma. Geographical distribution of S ratios measured on the surface sediments revealed that they are remarkably low in the central North Pacific. These facts suggest that S ratio can be used as a proxy for Asian eolian dust. The variations of S ratio and magnetic susceptibility with time and region can be explained by a model that Asian eolian dust has higher (lower) hematite (magnetite) concentration than other sources of magnetic minerals and that its input to the central North Pacific has increased since 2.5 Ma.