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FormingWorlds / PROTEUS

Coupled atmosphere-interior framework to simulate the temporal evolution of rocky planets.
https://fwl-proteus.readthedocs.io
Apache License 2.0
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Self-consistent surface albedo values #72

Closed nichollsh closed 2 weeks ago

nichollsh commented 7 months ago

SOCRATES allows us to choose a value for the surface reflectivity (albedo) between 0 and 1. This is important for setting the energy budget of the atmosphere, and thus for the entire planet. Hamano+15 used a surface albedo of 0.2, but recent work has shown that this is probably too large. The exact value depends on the composition/mineralogy of the melt (particularly fO2) and its temperature.

It would be physically consistent if we updated the surface albedo value throughout the simulation according to the conditions at the surface. There is some empirical basis for this.

https://doi.org/10.3847/1538-4357/ab9cba https://doi.org/10.1016/j.jnoncrysol.2005.09.003

timlichtenberg commented 1 month ago

The capability for this is now there in AGNI, isn't it? It would be good if Mark could implement some of the lab measurements, then this issue is essentially solved, right?

nichollsh commented 1 month ago

Yes, it's possible for AGNI to use a spectral surface albedo which is simply read-in from a CSV file.

We could have this be set by the configuration file, or maybe have PROTEUS choose the best one based on other parameters?

timlichtenberg commented 3 weeks ago

Having this set by the configuration file is the most useful option at the moment I think.

nichollsh commented 2 weeks ago

Definitely. My recent PR included code to download albedo data, but it's not yet accessed by AGNI. Maybe we can close this issue, since it's part of #74?