Impact of ocean dynamics on the simulation of the Neoproterozoic "Snowball Earth"
A fully coupled ocean-atmosphere general circulation model (the Fast Ocean-Atmosphere Model) is used to simulate the Neoproterozoic climate with a reduced solar luminosity (95% of present-day), low atmospheric CO 2 (140 ppmv), and an idealized tropical supercontinent. Two coupled simulations were co...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.23.3400 2023-05-15T18:17:20+02:00 Impact of ocean dynamics on the simulation of the Neoproterozoic "Snowball Earth" Christopher J. Poulsen Raymond T. Pierrehumbert Robert L. Jacob The Pennsylvania State University CiteSeerX Archives 2001 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.23.3400 http://geosci.uchicago.edu/~rtp1/papers/GRL_snowball_ocean/GRL_snowball_ocean.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.23.3400 http://geosci.uchicago.edu/~rtp1/papers/GRL_snowball_ocean/GRL_snowball_ocean.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://geosci.uchicago.edu/~rtp1/papers/GRL_snowball_ocean/GRL_snowball_ocean.pdf text 2001 ftciteseerx 2016-01-07T18:40:27Z A fully coupled ocean-atmosphere general circulation model (the Fast Ocean-Atmosphere Model) is used to simulate the Neoproterozoic climate with a reduced solar luminosity (95% of present-day), low atmospheric CO 2 (140 ppmv), and an idealized tropical supercontinent. Two coupled simulations were completed with present-day and cold initial ocean temperatures. These experiments are compared with uncoupled (i.e., mixed-layer) model experiments to determine the impact of a dynamical ocean on the Neoproterozoic simulations. In contrast to global sea-ice coverage in the uncoupled experiments, the sea-ice margin seasonally advances to 46 and 55 # latitude in the coupled experiments. The coupled simulations demonstrate that dynamic ocean processes can prevent a snowball solution and suggest that a reduced solar luminosity and low atmospheric CO 2 are not by themselves su#cient conditions for a snowball solution. Heat exchange through vertical mixing in the mid-latitudes, caused by static instability, is identified as the primary process halting the advance of the sea-ice margin. Text Sea ice Unknown |
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English |
description |
A fully coupled ocean-atmosphere general circulation model (the Fast Ocean-Atmosphere Model) is used to simulate the Neoproterozoic climate with a reduced solar luminosity (95% of present-day), low atmospheric CO 2 (140 ppmv), and an idealized tropical supercontinent. Two coupled simulations were completed with present-day and cold initial ocean temperatures. These experiments are compared with uncoupled (i.e., mixed-layer) model experiments to determine the impact of a dynamical ocean on the Neoproterozoic simulations. In contrast to global sea-ice coverage in the uncoupled experiments, the sea-ice margin seasonally advances to 46 and 55 # latitude in the coupled experiments. The coupled simulations demonstrate that dynamic ocean processes can prevent a snowball solution and suggest that a reduced solar luminosity and low atmospheric CO 2 are not by themselves su#cient conditions for a snowball solution. Heat exchange through vertical mixing in the mid-latitudes, caused by static instability, is identified as the primary process halting the advance of the sea-ice margin. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Christopher J. Poulsen Raymond T. Pierrehumbert Robert L. Jacob |
spellingShingle |
Christopher J. Poulsen Raymond T. Pierrehumbert Robert L. Jacob Impact of ocean dynamics on the simulation of the Neoproterozoic "Snowball Earth" |
author_facet |
Christopher J. Poulsen Raymond T. Pierrehumbert Robert L. Jacob |
author_sort |
Christopher J. Poulsen |
title |
Impact of ocean dynamics on the simulation of the Neoproterozoic "Snowball Earth" |
title_short |
Impact of ocean dynamics on the simulation of the Neoproterozoic "Snowball Earth" |
title_full |
Impact of ocean dynamics on the simulation of the Neoproterozoic "Snowball Earth" |
title_fullStr |
Impact of ocean dynamics on the simulation of the Neoproterozoic "Snowball Earth" |
title_full_unstemmed |
Impact of ocean dynamics on the simulation of the Neoproterozoic "Snowball Earth" |
title_sort |
impact of ocean dynamics on the simulation of the neoproterozoic "snowball earth" |
publishDate |
2001 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.23.3400 http://geosci.uchicago.edu/~rtp1/papers/GRL_snowball_ocean/GRL_snowball_ocean.pdf |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
http://geosci.uchicago.edu/~rtp1/papers/GRL_snowball_ocean/GRL_snowball_ocean.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.23.3400 http://geosci.uchicago.edu/~rtp1/papers/GRL_snowball_ocean/GRL_snowball_ocean.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766191484421275648 |