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Article: Early onset and origin of 100-kyr cycles in Pleistocene tropical SST records
Title | Early onset and origin of 100-kyr cycles in Pleistocene tropical SST records |
---|---|
Authors | |
Keywords | 100-Kyr Cycles Milankovitch Theory Obliquity Pleistocene Glaciations Tropics |
Issue Date | 2008 |
Publisher | Elsevier 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? |
Abstract | The 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 Identifier | http://hdl.handle.net/10722/151233 |
ISSN | 2023 Impact Factor: 4.8 2023 SCImago Journal Rankings: 2.294 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Liu, Z | en_US |
dc.contributor.author | Cleaveland, LC | en_US |
dc.contributor.author | Herbert, TD | en_US |
dc.date.accessioned | 2012-06-26T06:19:04Z | - |
dc.date.available | 2012-06-26T06:19:04Z | - |
dc.date.issued | 2008 | en_US |
dc.identifier.citation | Earth And Planetary Science Letters, 2008, v. 265 n. 3-4, p. 703-715 | en_US |
dc.identifier.issn | 0012-821X | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/151233 | - |
dc.description.abstract | The 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.language | eng | en_US |
dc.publisher | Elsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/epsl | en_US |
dc.relation.ispartof | Earth and Planetary Science Letters | en_US |
dc.subject | 100-Kyr Cycles | en_US |
dc.subject | Milankovitch Theory | en_US |
dc.subject | Obliquity | en_US |
dc.subject | Pleistocene Glaciations | en_US |
dc.subject | Tropics | en_US |
dc.title | Early onset and origin of 100-kyr cycles in Pleistocene tropical SST records | en_US |
dc.type | Article | en_US |
dc.identifier.email | Liu, Z:zhliu@hku.hk | en_US |
dc.identifier.authority | Liu, Z=rp00750 | en_US |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.doi | 10.1016/j.epsl.2007.11.016 | en_US |
dc.identifier.scopus | eid_2-s2.0-38049061762 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-38049061762&selection=ref&src=s&origin=recordpage | en_US |
dc.identifier.volume | 265 | en_US |
dc.identifier.issue | 3-4 | en_US |
dc.identifier.spage | 703 | en_US |
dc.identifier.epage | 715 | en_US |
dc.identifier.isi | WOS:000253082800030 | - |
dc.publisher.place | Netherlands | en_US |
dc.identifier.scopusauthorid | Liu, Z=16177844800 | en_US |
dc.identifier.scopusauthorid | Cleaveland, LC=6507471804 | en_US |
dc.identifier.scopusauthorid | Herbert, TD=7005866440 | en_US |
dc.identifier.issnl | 0012-821X | - |