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S. P. Shukla (New York University), S. Seager (Carnegie Institution of Washington), M. Chandler, M. Shopsin (Goddard Institute for Space Studies)
Earth’s spectral signature has changed throughout its climatic evolution and so we have many examples of ‘Earth as an extrasolar planet’ to study. Earth’s paleoclimatic conditions and their hemispherically integrated radiative signatures will provide insight into a range of habitable environments that could exist on Earth-like extrasolar planets, and their detectability by future space missions such as NASA's TPF.
We utilize the NASA Goddard Institute for Space Studies Model II General Circulation Model to simulate Earth-based paleoclimatic conditions and a line-by-line radiative transfer code to compute planetary spectra for our simulations. We focus on cold climate conditions, specifically simulations of the Last Glacial Maximum and Neoproterzoic glaciations (e.g., “snowball Earth”). We present our results on spectral signatures of these paleo-Earth climate simulations in comparison to modern-day Earth, as they would appear to a distant observer.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.