[1] For most of the Northern Hemisphere Ice Ages, from 3.0 to 0.8 m.y., global ice volume varied predominantly at the 41,000 year period of Earth’s orbital obliquity. However, summer (or summer caloric half year) insolation at high latitudes, which is widely believed to be the major influence on hig...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.371.5097 2023-05-15T16:41:03+02:00 Maureen E. Raymo Kerim Nisancioglu The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.5097 http://www.seas.harvard.edu/climate/pdf/raymo-2003.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.5097 http://www.seas.harvard.edu/climate/pdf/raymo-2003.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.seas.harvard.edu/climate/pdf/raymo-2003.pdf text ftciteseerx 2016-01-08T01:19:49Z [1] For most of the Northern Hemisphere Ice Ages, from 3.0 to 0.8 m.y., global ice volume varied predominantly at the 41,000 year period of Earth’s orbital obliquity. However, summer (or summer caloric half year) insolation at high latitudes, which is widely believed to be the major influence on high-latitude climate and ice volume, is dominated by the 23,000 year precessional period. Thus the geologic record poses a challenge to our understanding of climate dynamics. Here we propose that variations in the insolation gradient between high and low latitudes control high-latitude climate and ice volume during the late Pliocene and early Pleistocene. The differential heating between high and low latitudes, driven by obliquity, controls the atmospheric meridional flux of heat, moisture, and latent energy, which may exert the dominant control on high-latitude climate on Milankovitch timescales. In the two-dimensional zonal energy balance models typically used to study the longterm evolution of climate, the meridional atmospheric moisture flux is usually kept fixed. The hypothesis that insolation gradients control the poleward energy fluxes, precipitation, and ice volume at high latitudes has never been directly examined within the context of an ice sheet model. In light of what we know about modern energy fluxes and their relative influence on high-latitude climate, this possibility should be examined. INDEX TERMS: Text Ice Sheet Unknown |
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[1] For most of the Northern Hemisphere Ice Ages, from 3.0 to 0.8 m.y., global ice volume varied predominantly at the 41,000 year period of Earth’s orbital obliquity. However, summer (or summer caloric half year) insolation at high latitudes, which is widely believed to be the major influence on high-latitude climate and ice volume, is dominated by the 23,000 year precessional period. Thus the geologic record poses a challenge to our understanding of climate dynamics. Here we propose that variations in the insolation gradient between high and low latitudes control high-latitude climate and ice volume during the late Pliocene and early Pleistocene. The differential heating between high and low latitudes, driven by obliquity, controls the atmospheric meridional flux of heat, moisture, and latent energy, which may exert the dominant control on high-latitude climate on Milankovitch timescales. In the two-dimensional zonal energy balance models typically used to study the longterm evolution of climate, the meridional atmospheric moisture flux is usually kept fixed. The hypothesis that insolation gradients control the poleward energy fluxes, precipitation, and ice volume at high latitudes has never been directly examined within the context of an ice sheet model. In light of what we know about modern energy fluxes and their relative influence on high-latitude climate, this possibility should be examined. INDEX TERMS: |
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The Pennsylvania State University CiteSeerX Archives |
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Text |
author |
Maureen E. Raymo Kerim Nisancioglu |
spellingShingle |
Maureen E. Raymo Kerim Nisancioglu |
author_facet |
Maureen E. Raymo Kerim Nisancioglu |
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Maureen E. Raymo |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.5097 http://www.seas.harvard.edu/climate/pdf/raymo-2003.pdf |
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Ice Sheet |
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Ice Sheet |
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http://www.seas.harvard.edu/climate/pdf/raymo-2003.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.5097 http://www.seas.harvard.edu/climate/pdf/raymo-2003.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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1766031495153057792 |