Coupled Surface/Atmosphere/Interior Evolution of Venus: Current knowledge and future prospects

Details Coupled Surface/Atmosphere/Interior Evolution of Venus: Current knowledge and future prospects Coupled Surface/Atmosphere/Interior Evolution of Venus: Current knowledge and future prospects

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p33d..04g&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #P33D-04

Physics

0343 Planetary Atmospheres (5210, 5405, 5704), 5210 Planetary Atmospheres, Clouds, And Hazes (0343), 5405 Atmospheres (0343, 1060), 6295 Venus

Scientific paper

Venus is commonly thought to have experienced a transition, early in its history, from a wet, more Earth-like environment to its currently highly desiccated state. A more recent global transition is indicated by the sparse, randomly distributed and relatively pristine crater population, which implies a rapid decrease in volcanic resurfacing rate between 300 and 1000 Myr ago. The accompanying precipitous decline in outgassing rate would have caused large climate changes and globally synchronous plains deformation. These two transitions may have been causally related, as the loss of atmospheric water through evaporation, photodissociation and H escape caused the transition from plate tectonics to single plate behavior, and the cessation of subducting hydrated sediments caused the desiccation of the mantle and consequent loss of an asthenosphere. New data from Venus Express can help test these ideas by refining the timescale for water loss, constraining current outgassing rates, and improving models of climate, cloud formation and atmospheric dynamics, thus improving the sophistication of evolutionary climate models. I will discuss these efforts and review relevant plans for future missions.

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