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dc.contributor.authorDaradich, A
dc.contributor.authorHuybers, Peter
dc.contributor.authorMitrovica, Jerry
dc.contributor.authorChan, N
dc.contributor.authorAustermann, J
dc.date.accessioned2019-09-04T10:44:24Z
dc.date.issued2017-03
dc.identifier.citationDaradich, A., P. Huybers, J.X. Mitrovica, N.-H. Chan, and J. Austermann. 2017. The Influence of True Polar Wander on Glacial Inception in North America. Earth and Planetary Science Letters 461: 96-104.en_US
dc.identifier.issn0012-821Xen_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:41292196*
dc.description.abstractThe impact that long-term changes in Earth's rotation axis relative to the surface geography, or true polar wander (TPW), and continental drift have had in driving cooling of high-latitude North America since the Eocene is explored. Recent reanalyses of paleomagnetic pole positions suggest a secular drift in Earth's rotation axis of over the last 40 Myr, in a direction that has brought North America to increasingly higher latitudes. Using modern temperature data in tandem with a simple model, a reduction in the annual sum of positive degree days (PDDs) driven by this polar and plate motion over the last 20 Myr is quantified. At sites in Baffin Island, the TPW- and continental drift-driven decrease in insolation forcing over the last 20 Myr rivals changes in insolation forcing caused by variations in Earth's obliquity and precession. Using conservative PDD scaling factors and an annual snowfall equal to modern station observations, the snowiest location in Baffin Island 20 Myr ago had a mass balance deficit of ∼0.75–2 m yr−1 (water equivalent thickness) relative to its projected mass balance at 2.7 Ma. This mass balance deficit would have continued to increase as one goes back in time until ∼40 Myr ago based on adopted paleopole locations. TPW and continental drift that moved Arctic North America poleward would have strongly promoted glacial inception in Baffin Island at ∼3 Ma, a location where the proto-Laurentide Ice Sheet is thought to have originated.en_US
dc.description.sponsorshipEarth and Planetary Sciencesen_US
dc.language.isoen_USen_US
dc.publisherElsevier BVen_US
dash.licenseLAA
dc.titleThe Influence of True Polar Wander on Glacial Inception in North Americaen_US
dc.typeJournal Articleen_US
dc.description.versionVersion of Recorden_US
dc.relation.journalEarth and Planetary Science Lettersen_US
dash.depositing.authorHuybers, Peter
dc.date.available2019-09-04T10:44:24Z
dash.workflow.commentsFAR2017en_US
dash.funder.nameNational Science Foundationen_US
dash.funder.nameNSF P2C2en_US
dash.funder.nameNSF Division of Ocean Sciencesen_US
dash.funder.award1304309en_US
dash.funder.awardOCE-0825293en_US
dc.identifier.doi10.1016/j.epsl.2016.12.036
dc.source.journalEarth and Planetary Science Letters
dash.source.page96-104
dash.contributor.affiliatedMitrovica, Jerry
dash.contributor.affiliatedHuybers, Peter


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