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We set forth our ideas about the possible mechanisms of the observed water depletion in the atmospheres of Jupiter and Saturn at their enrichment with volatile elements heavier than neon (Ar, Kr, Xe, C, N, S, P), that was experimentally established during the space missions Pioner-10, -11, Voyager-1, -2 and Galileo. The proposed scenario consistently takes into account the current data on the gas removal from the protoplanetary disks around young solar-type stars, the evolution of the thermodynamic conditions in the disks, and the model of the giant planets formation. The considered mechanism of water origin in the atmospheres of Jupiter and Saturn makes it possible to explain the significant deficit of water in comparison with the abundances of other volatiles.