Arctic Oceanic Climate in Late Cenozoic Time

Herman, Yvonne; Hopkins, David M.

doi:10.1126/science.209.4456.557

Cited by 161 publications

(79 citation statements)

References 22 publications

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“…Backman (1979), Roberts et al (1982), Schnitker (1982), Shackleton et al (1984), , and Raymo et al (1986), however, used data from other DSDP sites to propose that major IRD input began at 2.4 to 2.6 Ma. The latter proposal correlates well with the timing of IRD initiation in the North Pacific (Krissek et al, 1985;Carney, 1986), while an initiation prior to 2.5 Ma is supported by the presence of IRD in older sediments of the Arctic Ocean (Herman and Hopkins, 1980;Margolis and Herman, 1980). All of the strati-1 Eldholm, O., Thiede, J., Taylor, E., et al, 1989.…”

Section: Introductionmentioning

confidence: 70%

Late Cenozoic Records of Ice-Rafting at ODP Sites 642, 643, and 644, Norwegian Sea: Onset, Chronology, and Characteristics of Glacial/Interglacial Fluctuations

Krissek¹

1989

Proceedings of the Ocean Drilling Program

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The abundance and composition of the upper Cenozoic terrigenous coarse-sand fraction (250 fim-2 mm) at ODP Sites 642, 643, and 644 were investigated to date the onset of significant ice-rafting in the Norwegian Sea, establish the regional chronology of ice-rafting, and determine the relative importance of global vs. regional controls on ice-rafting in this area. The first input of ice-rafted debris (IRD) occurs at approximately 2.9 Ma, with significant ice-rafting beginning at about 2.5 Ma. IRD abundances increase significantly in sediments younger than 0.9 Ma at all three holes, indicating climatic deterioration in the late Pleistocene. Differences in the timing of this IRD increase between holes result from regional patterns of IRD supply and surface circulation. Variations in IRD sources and dispersal patterns may also explain the slightly higher background level of IRD abundance at Hole 642B, a seaward site.Major peaks in the generalized IRD records from the Norwegian Sea are tentatively correlated to glacial stages or glacial-to-interglacial transitions in the globally defined oxygen isotope record. This correlation indicates the effect of global conditions on the regional climate of the Norwegian Sea, although the detailed IRD records at these sites are also affected by local/regional processes (e.g., circulation patterns and source area differences).

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Section: Introductionmentioning

confidence: 70%

Late Cenozoic Records of Ice-Rafting at ODP Sites 642, 643, and 644, Norwegian Sea: Onset, Chronology, and Characteristics of Glacial/Interglacial Fluctuations

Krissek¹

1989

Proceedings of the Ocean Drilling Program

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“…It has been proposed that the Arctic Ocean has been permanently icecovered since the late Miocene (Clark, 1982). Other studies conclude that perennial sea-ice cover developed in the Matuyama Chron (0.78 to 2.58 Ma) or at the Brunhes/Matuyama chron boundary (Herman and Hopkins, 1980;Carter et al, 1986;Repenning et al, 1987). Although ice precludes drilling within the central Arctic, drilling by the JOIDES Resolution along the present ice margins will provide sediments to better constrain the history of sea-ice extent.…”

Section: Climate Evolution Of the North Atlantic-arctic Region Cenozomentioning

confidence: 99%

Leg 162: New Frontiers on Past Climates

Jansen¹,

Raymo²

1996

Proceedings of the Ocean Drilling Program

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The North Atlantic Ocean and Nordic Seas represent one of the most climatically variable and sensitive regions on Earth. Our goal on Leg 162 was to recover sedimentary sequences with which to investigate the evolution of Northern Hemisphere climate on time scales ranging from hundreds to millions of years. These objectives required drilling rapidly deposited (>50 m/ m.y.) sequences, with triple APC coring to refusal. This approach allowed the retrieval of continuous sedimentary records for high-resolution analysis of the high frequency (orbital-and millennial-scale) components of the climate system. At the same time, these sequences also span the last few millions of years, an interval over which the average climate state has evolved toward generally colder conditions and over which the spectral character of orbital-scale variations has changed dramatically. Composite sections documenting continuous sedimentation were recovered at almost every site. These composites, many of which have sedimentation rates of over 10 cm/k.y., are based on continuous and high-resolution discrete data obtained by the multisensor track (including magnetic susceptibility, natural gamma radiation, P-wave velocity, and GRAPE bulk density), as well as spectral reflectance measurements. This data typically has a temporal resolution of hundreds rather than thousands of years. These sites will provide the basis of ultra-high-resolution paleoceanographic studies of a key region in the global climate system for years to come.

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“…726 Hooper, P.W.P. 727 Hopkins, D. M. 728,1555 Hopkins, David M. 695 Hornibrook, N. de B. 729,730,731,732,733 Horowitz, A.…”

Section: 2mentioning

confidence: 99%

A working bibliography for the Pliocene

Adam¹,

Dieffenbach²,

McCormick³

1990

Open-File Report

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Arctic Oceanic Climate in Late Cenozoic Time

Abstract: Faunal and lithologic evidence is used to reconstruct paleoceanographic events over the last 4.5 million years. The inception of perennial sea-ice cover is dated at about 0.7 million years.

Cited by 161 publications

References 22 publications

Late Cenozoic Records of Ice-Rafting at ODP Sites 642, 643, and 644, Norwegian Sea: Onset, Chronology, and Characteristics of Glacial/Interglacial Fluctuations

Late Cenozoic Records of Ice-Rafting at ODP Sites 642, 643, and 644, Norwegian Sea: Onset, Chronology, and Characteristics of Glacial/Interglacial Fluctuations

Leg 162: New Frontiers on Past Climates

A working bibliography for the Pliocene

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