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Article: Early onset and origin of 100-kyr cycles in Pleistocene tropical SST records

TitleEarly onset and origin of 100-kyr cycles in Pleistocene tropical SST records
Authors
Keywords100-Kyr Cycles
Milankovitch Theory
Obliquity
Pleistocene Glaciations
Tropics
Issue Date2008
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/epsl
Citation
Earth And Planetary Science Letters, 2008, v. 265 n. 3-4, p. 703-715 How to Cite?
AbstractThe large 100-kyr cycles evident in most late-Pleistocene (0-0.6 Ma) paleoclimatic records still lack a satisfactory explanation. Previous studies of the nature of the transition from the early Pleistocene (1.2-1.8 Ma) 41-kyr-dominated climate regime to the 100-kyr world have been based almost exclusively on benthic foraminiferal oxygen isotopic (δ18O) data. It is generally accepted that the late Pleistocene 100-kyr cycles represent a newly evolved sensitivity to eccentricity/precession, superimposed on an earlier, and largely constant, response to obliquity and precession forcing. However, orbitally-resolved Pleistocene sea surface temperature (SST) records from a variety of oceanic regions paint a rather different picture of the global climate transition across the mid-Pleistocene transition (MPT, 0.6-1.2 Ma). Reanalysis of these SST records shows that: (1) an early onset of strong 100-kyr-like cycles in two low-frequency bands (∼ 120-145 kyr and ∼ 60-80 kyr), derived from the bundling of two/three obliquity cycles into grand cycles (obliquity subharmonics), occurred in tropical SST records during the early Pleistocene, (2) these two early Pleistocene periods converge into the late-Pleistocene 100-kyr period in tropical SST records, (3) the dominance of 100-kyr SST power in the late Pleistocene coincides with a dramatic decline in the 41-kyr SST power, and (4) the correlation of timing of glacial terminations with eccentricity/precession variation could well extend back into the early Pleistocene. We demonstrate that most of these features also occur in δ18O records, but in a much more subtle manner. These features could be explained in two plausible ways: a shift in climate sensitivity from obliquity to eccentricity/precession (a modified version of the conventional view) or an increasingly nonlinear response to orbital obliquity across the MPT. However, our examination of the development of ∼100-kyr cycles favors an obliquity bundling mechanism to form late Pleistocene 100-kyr cycles. We therefore suggest that the late Pleistocene 100-kyr climatic cycles are likely a nonlinear response to orbital obliquity, although the timing of late Pleistocene 100-kyr climatic cycles and their early forms appears to be paced by eccentricity/precession. © 2007 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151233
ISSN
2015 Impact Factor: 4.326
2015 SCImago Journal Rankings: 3.628
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLiu, Zen_US
dc.contributor.authorCleaveland, LCen_US
dc.contributor.authorHerbert, TDen_US
dc.date.accessioned2012-06-26T06:19:04Z-
dc.date.available2012-06-26T06:19:04Z-
dc.date.issued2008en_US
dc.identifier.citationEarth And Planetary Science Letters, 2008, v. 265 n. 3-4, p. 703-715en_US
dc.identifier.issn0012-821Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/151233-
dc.description.abstractThe large 100-kyr cycles evident in most late-Pleistocene (0-0.6 Ma) paleoclimatic records still lack a satisfactory explanation. Previous studies of the nature of the transition from the early Pleistocene (1.2-1.8 Ma) 41-kyr-dominated climate regime to the 100-kyr world have been based almost exclusively on benthic foraminiferal oxygen isotopic (δ18O) data. It is generally accepted that the late Pleistocene 100-kyr cycles represent a newly evolved sensitivity to eccentricity/precession, superimposed on an earlier, and largely constant, response to obliquity and precession forcing. However, orbitally-resolved Pleistocene sea surface temperature (SST) records from a variety of oceanic regions paint a rather different picture of the global climate transition across the mid-Pleistocene transition (MPT, 0.6-1.2 Ma). Reanalysis of these SST records shows that: (1) an early onset of strong 100-kyr-like cycles in two low-frequency bands (∼ 120-145 kyr and ∼ 60-80 kyr), derived from the bundling of two/three obliquity cycles into grand cycles (obliquity subharmonics), occurred in tropical SST records during the early Pleistocene, (2) these two early Pleistocene periods converge into the late-Pleistocene 100-kyr period in tropical SST records, (3) the dominance of 100-kyr SST power in the late Pleistocene coincides with a dramatic decline in the 41-kyr SST power, and (4) the correlation of timing of glacial terminations with eccentricity/precession variation could well extend back into the early Pleistocene. We demonstrate that most of these features also occur in δ18O records, but in a much more subtle manner. These features could be explained in two plausible ways: a shift in climate sensitivity from obliquity to eccentricity/precession (a modified version of the conventional view) or an increasingly nonlinear response to orbital obliquity across the MPT. However, our examination of the development of ∼100-kyr cycles favors an obliquity bundling mechanism to form late Pleistocene 100-kyr cycles. We therefore suggest that the late Pleistocene 100-kyr climatic cycles are likely a nonlinear response to orbital obliquity, although the timing of late Pleistocene 100-kyr climatic cycles and their early forms appears to be paced by eccentricity/precession. © 2007 Elsevier B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/epslen_US
dc.relation.ispartofEarth and Planetary Science Lettersen_US
dc.subject100-Kyr Cyclesen_US
dc.subjectMilankovitch Theoryen_US
dc.subjectObliquityen_US
dc.subjectPleistocene Glaciationsen_US
dc.subjectTropicsen_US
dc.titleEarly onset and origin of 100-kyr cycles in Pleistocene tropical SST recordsen_US
dc.typeArticleen_US
dc.identifier.emailLiu, Z:zhliu@hku.hken_US
dc.identifier.authorityLiu, Z=rp00750en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.epsl.2007.11.016en_US
dc.identifier.scopuseid_2-s2.0-38049061762en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-38049061762&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume265en_US
dc.identifier.issue3-4en_US
dc.identifier.spage703en_US
dc.identifier.epage715en_US
dc.identifier.isiWOS:000253082800030-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridLiu, Z=16177844800en_US
dc.identifier.scopusauthoridCleaveland, LC=6507471804en_US
dc.identifier.scopusauthoridHerbert, TD=7005866440en_US

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