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Day–night cloud asymmetry prevents early oceans on Venus but not on Earth - Nature.com

Day–night cloud asymmetry prevents early oceans on Venus but not on Earth - Nature.com

Day–night cloud asymmetry prevents early oceans on Venus but not on Earth - Nature.com
Oct 13, 2021 44 secs

The conditions required for water to have initially condensed on the surface of Solar System terrestrial planets are highly uncertain, as they have so far only been studied with one-dimensional numerical climate models3 that cannot account for the effects of atmospheric circulation and clouds, which are key climate stabilizers

Here we show using three-dimensional global climate model simulations of early Venus and Earth that water clouds—which preferentially form on the nightside, owing to the strong subsolar water vapour absorption—have a strong net warming effect that inhibits surface water condensation even at modest insolations (down to 325 watts per square metre, that is, 0.95 times the Earth solar constant)

This shows that water never condensed and that, consequently, oceans never formed on the surface of Venus

This also implies the existence of another stability state for present-day Earth: the ‘steam Earth’, with all the water from the oceans evaporated into the atmosphere

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