Land-Ocean pattern used to model clouds shielding Venus, making the planet habitable. Credits: NASA.
Land-Ocean pattern used to model clouds shielding Venus, making the planet habitable. Credits: NASA.

 

Name

Michael Way
Department of Physics and Astronomy, Astronomy and Space Physics, Uppsala University

Title

MISU theme “Earth in Space” seminar: Modeling Venus Through Time and its Implications for the liquid water Habitable Zone

Abstract

In a recent paper we demonstrated that the climatic history of Venus may have allowed for surface liquid water to exist for several billion years using a modern three-dimensional general circulation model, see paper.  A number of assumptions were made based on what little data we have for early Venus such as the type of solar spectrum extant at that time, orbital parameters, estimates of a shallow ocean from Pioneer Venus D/H ratios, and topography from the Magellan Mission. We also assumed that it would have had an atmosphere similar to modern day Earth: 1 bar N2, 400ppmv CO2, 1ppmv CH4.  I will discuss the motivations behind these assumptions and additional parameter space studies with direct relevance to hypothetical exoplanetary Venus-like worlds found at the inner edge of the liquid water habitable zone. Finally, I will show how our studies demonstrate that the reason for Venus' present climatic state is unlikely to be related to the gradual warming of our sun over the past 4Gyr as is commonly believed. 

 

Time and Place

Tuesday March 13th 2018, 11.15
Rossbysalen C609, Arrhenius Laboratory, 6th floor

 

Welcome!