Mathematics – Logic
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29k..10p&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 11, pp. 10-1, CiteID 1515, DOI 10.1029/2001GL014352
Mathematics
Logic
6
Meteorology And Atmospheric Dynamics: Paleoclimatology, Oceanography: General: Paleoceanography, Information Related To Geologic Time: Precambrian
Scientific paper
The distribution of continents during the Neoproterozoic has been hypothesized to play an important role in the initiation of an ice-covered Earth. In this study, the influence of paleogeography on the Neoproterozoic climate is evaluated using a fully coupled ocean-atmosphere general circulation model (FOAM). Three simulations were completed with different continental distributions. Each simulation included a reduced solar luminosity (93% of present-day) and low atmospheric CO2 (140 ppmv). Model results indicate that a low-latitude concentration of continents leads to lower tropical temperatures, through reduced receipt of shortwave radiation and a smaller tropical greenhouse effect, but does not significantly affect high-latitude temperatures or sea-ice extent. In contrast, the presence of snow-covered, mid- and high-latitude continents increases the sensible heat transport over the ocean, giving rise to sea-surface cooling, deep-water formation, and an advanced sea-ice margin. Nonetheless, an ice-covered Earth is not simulated in these experiments.
Huynh Tran T.
Jacob Robert L.
Pierrehumbert Raymond T.
Poulsen Christopher J.
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