2004: Factors that inhibit snowball Earth simulation
[1] A coupled ocean-atmosphere general circulation model with a thermodynamic sea-ice model, the Fast Ocean Atmosphere Model version 1.5, is used to investigate the factors that inhibit the simulation of global sea ice. In the control experiment with reduced solar luminosity (93 % of modern), low at...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.494.2507 2023-05-15T18:16:04+02:00 2004: Factors that inhibit snowball Earth simulation C. J. Poulsen R. L. Jacob The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.494.2507 http://earth.geology.yale.edu/~avf5/teaching/Files_pdf/PoulsenSNOWball.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.494.2507 http://earth.geology.yale.edu/~avf5/teaching/Files_pdf/PoulsenSNOWball.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://earth.geology.yale.edu/~avf5/teaching/Files_pdf/PoulsenSNOWball.pdf text ftciteseerx 2016-01-08T08:40:59Z [1] A coupled ocean-atmosphere general circulation model with a thermodynamic sea-ice model, the Fast Ocean Atmosphere Model version 1.5, is used to investigate the factors that inhibit the simulation of global sea ice. In the control experiment with reduced solar luminosity (93 % of modern), low atmospheric pCO2 (140 ppm), and an idealized tropical continent, the sea-ice margin equilibrates at 27 latitude. A series of experiments was completed to systematically test the influence of deep-ocean circulation, wind-driven ocean circulation, convective mixing, sea-ice treatment, and radiative-cloud forcing, on the sea-ice extent. Model results indicate that both wind-driven circulation and cloud-radiative forcing are critical factors that inhibit sea-ice advance into the low latitudes. The wind-driven ocean circulation transports heat to the sea-ice margin, stabilizing the sea-ice margin. Clouds yield a positive radiative forcing over ice, warming the air overlying sea ice and decreasing sensible heat loss at the sea-ice margin. In the absence of either factor, sea ice expands to the equator within 15 model years, yielding a snowball Earth. We also find that intensification of the Hadley circulation as sea ice enters the Hadley domain promotes the climate instability that leads to global sea-ice cover. Results from this study help explain the wide disparity in conditions necessary to simulate global ice cover in Text Sea ice Unknown |
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English |
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[1] A coupled ocean-atmosphere general circulation model with a thermodynamic sea-ice model, the Fast Ocean Atmosphere Model version 1.5, is used to investigate the factors that inhibit the simulation of global sea ice. In the control experiment with reduced solar luminosity (93 % of modern), low atmospheric pCO2 (140 ppm), and an idealized tropical continent, the sea-ice margin equilibrates at 27 latitude. A series of experiments was completed to systematically test the influence of deep-ocean circulation, wind-driven ocean circulation, convective mixing, sea-ice treatment, and radiative-cloud forcing, on the sea-ice extent. Model results indicate that both wind-driven circulation and cloud-radiative forcing are critical factors that inhibit sea-ice advance into the low latitudes. The wind-driven ocean circulation transports heat to the sea-ice margin, stabilizing the sea-ice margin. Clouds yield a positive radiative forcing over ice, warming the air overlying sea ice and decreasing sensible heat loss at the sea-ice margin. In the absence of either factor, sea ice expands to the equator within 15 model years, yielding a snowball Earth. We also find that intensification of the Hadley circulation as sea ice enters the Hadley domain promotes the climate instability that leads to global sea-ice cover. Results from this study help explain the wide disparity in conditions necessary to simulate global ice cover in |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
C. J. Poulsen R. L. Jacob |
spellingShingle |
C. J. Poulsen R. L. Jacob 2004: Factors that inhibit snowball Earth simulation |
author_facet |
C. J. Poulsen R. L. Jacob |
author_sort |
C. J. Poulsen |
title |
2004: Factors that inhibit snowball Earth simulation |
title_short |
2004: Factors that inhibit snowball Earth simulation |
title_full |
2004: Factors that inhibit snowball Earth simulation |
title_fullStr |
2004: Factors that inhibit snowball Earth simulation |
title_full_unstemmed |
2004: Factors that inhibit snowball Earth simulation |
title_sort |
2004: factors that inhibit snowball earth simulation |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.494.2507 http://earth.geology.yale.edu/~avf5/teaching/Files_pdf/PoulsenSNOWball.pdf |
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Sea ice |
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Sea ice |
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http://earth.geology.yale.edu/~avf5/teaching/Files_pdf/PoulsenSNOWball.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.494.2507 http://earth.geology.yale.edu/~avf5/teaching/Files_pdf/PoulsenSNOWball.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766189485174816768 |