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      Remote Sensing of Planetary Properties and Biosignatures on Extrasolar Terrestrial Planets

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          A neoproterozoic snowball earth

          Negative carbon isotope anomalies in carbonate rocks bracketing Neoproterozoic glacial deposits in Namibia, combined with estimates of thermal subsidence history, suggest that biological productivity in the surface ocean collapsed for millions of years. This collapse can be explained by a global glaciation (that is, a snowball Earth), which ended abruptly when subaerial volcanic outgassing raised atmospheric carbon dioxide to about 350 times the modern level. The rapid termination would have resulted in a warming of the snowball Earth to extreme greenhouse conditions. The transfer of atmospheric carbon dioxide to the ocean would result in the rapid precipitation of calcium carbonate in warm surface waters, producing the cap carbonate rocks observed globally.
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            Runaway and moist greenhouse atmospheres and the evolution of Earth and Venus

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              Thermal and albedo mapping of Mars during the Viking primary mission

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                Author and article information

                Journal
                Astrobiology
                Astrobiology
                Mary Ann Liebert Inc
                1531-1074
                1557-8070
                June 2002
                June 2002
                : 2
                : 2
                : 153-181
                Article
                10.1089/15311070260192246
                12469366
                e39be4ed-d281-49e7-8323-79de0afb350d
                © 2002
                History

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