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How obliquity cycles powered early Pleistocene global ice‐volume variability

dc.contributor.authorTabor, Clay R.en_US
dc.contributor.authorPoulsen, Christopher J.en_US
dc.contributor.authorPollard, Daviden_US
dc.date.accessioned2015-05-04T20:35:57Z
dc.date.available2016-05-10T20:26:28Zen
dc.date.issued2015-03-28en_US
dc.identifier.citationTabor, Clay R.; Poulsen, Christopher J.; Pollard, David (2015). "How obliquity cycles powered early Pleistocene global ice‐volume variability." Geophysical Research Letters 42(6): 1871-1879.en_US
dc.identifier.issn0094-8276en_US
dc.identifier.issn1944-8007en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/111096
dc.description.abstractMilankovitch theory proposes that the magnitude of high‐latitude summer insolation dictates the continental ice‐volume response by controlling summer snow melt, thus anticipating a substantial ice‐volume contribution from the strong summer insolation signal of precession. Yet almost all of the early Pleistocene δ18O records' signal strength resides at the frequency of obliquity. Here we explore this discrepancy using a climate‐vegetation‐ice sheet model to simulate climate‐ice sheet response to transient orbits of varying obliquity and precession. Spectral analysis of our results shows that despite contributing significantly less to the summer insolation signal, almost 60% of the ice‐volume power exists at the frequency of obliquity due to a combination of albedo feedbacks, seasonal offsets, and orbital cycle duration differences. Including eccentricity modulation of the precession ice‐volume component and assuming a small Antarctic ice response to orbital forcing produce a signal that agrees with the δ18O ice‐volume proxy records.Key PointsClimate responses to orbital changes simulated with an Earth system modelModel produces a larger ice‐volume response to obliquity than precessionModel results agree with early Pleistocene oxygen isotope recordsen_US
dc.publisherBelgradeen_US
dc.publisherWiley Periodicals, Inc.en_US
dc.subject.otherice sheeten_US
dc.subject.otherisotopesen_US
dc.subject.othervegetationen_US
dc.subject.otherorbiten_US
dc.subject.othersea iceen_US
dc.subject.otherPleistoceneen_US
dc.titleHow obliquity cycles powered early Pleistocene global ice‐volume variabilityen_US
dc.typeArticleen_US
dc.rights.robotsIndexNoFollowen_US
dc.subject.hlbsecondlevelGeological Sciencesen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/111096/1/grl52691-sup-0001-SIGRL.pdf
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/111096/2/grl52691.pdf
dc.identifier.doi10.1002/2015GL063322en_US
dc.identifier.sourceGeophysical Research Lettersen_US
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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