Dt pA p

where W0 signifies the fresh water content in a unit column of the ocean.

Equations (2.4.1)-(2.4.4) describe, respectively, atmospheric, cryospheric, continental and ocean components of the hydrologic cycle. After integrating the first of these equations over the whole Earth, the second one - over the sea ice surface, the third one - over the land surface, and the fourth one -over the ocean surface free from ice, and using the continuity condition for the vertically integrated fresh water mass transport at the ocean-land interface, we obtain

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