Sea Ice as the Glacial Cycles’ Climate Switch: Role of Seasonal and Orbital Forcing

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Sea Ice as the Glacial Cycles’ Climate Switch: Role of Seasonal and Orbital Forcing

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dc.contributor.author Tziperman, Eli
dc.contributor.author Gildor, Hezi
dc.date.accessioned 2009-11-30T21:20:27Z
dc.date.issued 2000
dc.identifier.citation Gildor, Hezi, and Eli Tziperman. 2000. Sea ice as the glacial cycles’ climate switch: Role of seasonal and orbital forcing. Paleoceanography 15(6): 605–615. en_US
dc.identifier.issn 0883-8305 en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:3425936
dc.description.abstract A box model of the coupled ocean, atmosphere, sea ice, and land ice climate system is used to study glacial-interglacial oscillations under seasonally and orbitally varying solar forcing. The dominant 100 kyr oscillation in land ice volume has the familiar sawtooth shape of climate proxy records, and to zeroth order, it does not depend on the seasonal and Milankovitch forcing. The sea ice controls, via its albedo and insulating effects, the atmospheric moisture fluxes and precipitation that enable the land ice sheet growth. This control and the rapid growth and melting of the sea ice allow the sea ice to rapidly switch the climate system from a growing ice sheet phase to a retreating ice sheet phase and to shape the oscillation’s sawtooth structure. A specific physical mechanism is proposed by which the insolation changes act as a pacemaker, setting the phase of the oscillation by directly controlling summer melting of ice sheets. This mechanism is shown to induce deglaciations during periods of lower summer insolation. Superimposed on the 100 kyr are the linear Milankovitch-forced frequencies of 19, 23, and 41 kyr. The transition from 41 kyr glacial cycles to 100 kyr cycles one million years ago may be explained as being due to the activation of the sea ice switch at that time. This would be the case if sea ice extent was more limited during the warmer climate of the early Pleistocene. en_US
dc.description.sponsorship Earth and Planetary Sciences en_US
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.isversionof http://dx.doi.org/10.1029/1999PA000461 en_US
dc.relation.hasversion http://environment.harvard.edu/docs/faculty_pubs/tziperman_sea.pdf
dash.license META_ONLY
dc.title Sea Ice as the Glacial Cycles’ Climate Switch: Role of Seasonal and Orbital Forcing en_US
dc.type Journal Article en_US
dc.description.version Version of Record en_US
dc.relation.journal Paleoceanography en_US
dash.depositing.author Tziperman, Eli
dash.embargo.until 10000-01-01

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