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dc.contributor.authorOmta, Anne Willem
dc.contributor.authorKooi, Bob W.
dc.contributor.authorvan Voorn, George A. K.
dc.contributor.authorRickaby, Rosalind E. M.
dc.contributor.authorFollows, Michael J
dc.date.accessioned2016-07-07T19:12:42Z
dc.date.available2016-07-07T19:12:42Z
dc.date.issued2015-04
dc.identifier.issn0930-7575
dc.identifier.issn1432-0894
dc.identifier.urihttp://hdl.handle.net/1721.1/103540
dc.description.abstractAt the Mid-Pleistocene Transition about 1 Ma, the dominant periodicity of the glacial-interglacial cycles shifted from ~40 to ~100 kyr. Here, we use a previously developed mathematical model to investigate the possible dynamical origin of these different periodicities. The model has two variables, one of which exhibits sawtooth oscillations, resembling the glacial-interglacial cycles, whereas the other variable exhibits spikes at the rapid transitions. When applying a sinusoidal forcing with a fixed period, there emerges a rich variety of cycles with different periodicities, each being a multiple of the forcing period. Furthermore, the dominant periodicity of the system can change, while the forcing periodicity remains fixed, due to either random variations or different frequency components of the orbital forcing. Two key relationships stand out as predictions to be tested against observations: (1) the amplitude and the periodicity of the cycles are approximately linearly proportional to each other, a relationship that is also found in the δ[superscript 18]O temperature proxy. (2) The magnitude of the spikes increases with increasing periodicity and amplitude of the sawtooth. This prediction could be used to identify one or more currently hidden spiking variables driving the glacial-interglacial transitions. Essentially, the quest would be for any proxy record, concurrent with a dynamical model prediction, that exhibits deglacial spikes which increase at times when the amplitude/periodicity of the glacial cycles increases. In the specific context of our calcifier-alkalinity mechanism, the records of interest would be calcifier productivity and calcite accumulation. We believe that such a falsifiable hypothesis should provide a strong motivation for the collection of further records.en_US
dc.description.sponsorshipNational Science Foundation (U.S.) (NSF Grant OCE-1155295)en_US
dc.description.sponsorshipEuropean Research Council (ERC) (Grant SP2-GA-2008-200915)en_US
dc.description.sponsorshipNational Science Foundation (U.S.) (NSF Grant OCE-1259388)en_US
dc.description.sponsorshipNetherlands. Ministry of Economic Affairs (Knowledge Base IV (KBIV) ‘sustainable spatial development of ecosystems, landscapes, seas and regions’)en_US
dc.publisherSpringer Berlin Heidelbergen_US
dc.relation.isversionofhttp://dx.doi.org/10.1007/s00382-015-2598-xen_US
dc.rightsCreative Commons Attribution-Noncommercial-Share Alikeen_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/en_US
dc.sourceSpringer Berlin Heidelbergen_US
dc.titleInherent characteristics of sawtooth cycles can explain different glacial periodicitiesen_US
dc.typeArticleen_US
dc.identifier.citationOmta, Anne Willem, Bob W. Kooi, George A. K. van Voorn, Rosalind E. M. Rickaby, and Michael J. Follows. “Inherent Characteristics of Sawtooth Cycles Can Explain Different Glacial Periodicities.” Climate Dynamics 46, no. 1–2 (April 16, 2015): 557–569.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciencesen_US
dc.contributor.mitauthorOmta, Anne Willemen_US
dc.contributor.mitauthorFollows, Michael J.en_US
dc.relation.journalClimate Dynamicsen_US
dc.eprint.versionAuthor's final manuscripten_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dc.date.updated2016-05-23T12:10:10Z
dc.language.rfc3066en
dc.rights.holderSpringer-Verlag Berlin Heidelberg
dspace.orderedauthorsOmta, Anne Willem; Kooi, Bob W.; van Voorn, George A. K.; Rickaby, Rosalind E. M.; Follows, Michael J.en_US
dspace.embargo.termsNen
dc.identifier.orcidhttps://orcid.org/0000-0002-3102-0341
mit.licenseOPEN_ACCESS_POLICYen_US


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