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Progress in Earth and Planetary Science
Fig. 8 | Progress in Earth and Planetary Science

Fig. 8

From: Deep mantle melting, global water circulation and its implications for the stability of the ocean mass

Fig. 8

A model of water transport across the mantle transition zone. a A model without melting fu: area fraction of upwelling, fd: area fraction of down-welling, Uu: velocity of upwelling, Ud: velocity of down-welling. From the mass conservation, \( {f}_u{U}_u={f}_d{U}_d\equiv \frac{1}{2}U \). b A model with melting. In this model, we assume that melts formed above the MTZ are heavy and the melts formed below the MTZ are light. U′ the velocity of migration of the MRL materials from upwelling regions to the subduction zones (this depends on mantle viscosity and is fast only above 410 km)

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