Mathematics – Logic
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm...p32a13v&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #P32A-13
Mathematics
Logic
1030 Geochemical Cycles (0330), 1615 Biogeochemical Processes (4805), 5407 Atmospheres--Evolution
Scientific paper
A new conceptual Earth system model is presented to investigate the long-term co-evolution of geosphere and biosphere from the geological past up to 1.5 billion years into the planet's future. The model is based on the global carbon cycle mediated by life and driven by increasing solar luminosity and plate tectonics. As a major result of our investigation we calculate the ``terrestrial life corridor'', i.e. the biogeophysical domain supporting a photosynthesis-based ecosphere during planetary history and future. Furthermore, we calculate the behavior of our virtual Earth system at various distances from the Sun, using different insolations. In this way, we can find the habitable zone as the band of orbital distances from the Sun within which an Earth-like planet might enjoy moderate surface temperatures and CO2-partial pressures needed for advanced life forms. We calculate an optimum position at 1.08 astronomical units for an Earth-like planet at which the biosphere would realize the maximum life span. According to our results, an Earth-like planet at Martian distance would have been habitable up to 500 Myr ago.
Bounama Ch.
Franck Siegfried
von Bloh Werner
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