Late Cenozoic Arctic Ocean sea ice and terrestrial paleoclimate

Carter, L. David; Brigham‐Grette, Julie; Marincovich, Louie; Pease, Victoria; Hillhouse, John W.

doi:10.1130/0091-7613(1986)14<675:lcaosi>2.0.co;2

Cited by 67 publications

(40 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…How this transition relates to the regional climate and oceanographic history is poorly understood. Terrestrial evidence indicates forested areas in the Arctic fringes, far north of the present forest/tundra boundary, until about 2 Ma (Carter et al, 1986;Nelson and Carter, 1985;Funder et al, 1985;Repenning et al, 1987). The chronology from these land sites is poorly constrained, however, and no continuous records from land sites document the transition into a cold Arctic climate.…”

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

confidence: 95%

“…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%

See 1 more Smart Citation

Leg 162: New Frontiers on Past Climates

Jansen¹,

Raymo²

1996

Proceedings of the Ocean Drilling Program

View full text Add to dashboard Cite

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.

show abstract

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

confidence: 95%

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

View full text Add to dashboard Cite

show abstract

“…It has been proposed that the Arctic Ocean has been permanently ice covered since the late Miocene (Clark, 1982). Other studies conclude that this event happened in the Matuyama or at the Brunhes/Matuyama boundary (Herman and Hopkins, 1980;Carter et al, 1986;Repenning et al., 1987). This discrepancy in timing cannot be verified by the available material.…”

Section: Climate Evolution Of High Northern Latitudesmentioning

confidence: 96%

“…The major shift to a mode of variation characterized by repeated large glacials in Scandinavia probably occurred at about 2.5 Ma and was further amplified at about 1 Ma (Jansen et al, 1988;Jansen and Sj0holm, 1991 (Einarsson and Albertsson, 1988). Terrestrial evidence also indicates forested areas in the Arctic fringes, which are far north of the present forest-tundra boundary, until about 2 Ma (Carter et al, 1986;Nelson and Carter, 1985;Funder et al, 1985;Repenning et al, 1987). The chronology from these land sites is, however, poorly constrained, and since this is only scattered evidence, there are no continuous records from land sites that document the climatic transition into a cold arctic climate.…”

Section: Climate Evolution Of High Northern Latitudesmentioning

confidence: 98%

Scientific Prospectus: FY95 Program

Webb¹,

Baldauf²

1994

Ocean Drilling Program Technical Notes

View full text Add to dashboard Cite

“…Par ticularly important discrepancies to ODP Leg 104 findings have been pointed out in the circum-arctic realm . Paleogene evidence from Svalbard (Dalland, 1977), Neo gene data from northeastern Greenland (Funder et al, 1985), northern Alaska (Carter et al, 1986) and upper Neogene-Quaternary evidence from the base of the Greenland ice shield (Harwood, 1986) do not fit the interpretations of the corresponding pelagic record. Many of these discrepancies are probably due to stratigraphic problems that will be solved in time, but the vir tual lack of a detailed set of data from the central Arctic Ocean represents probably the most important obstacle to further pro gress in understanding the processes that led to the Cenozoic cooling events in the Northern Hemisphere.…”

Section: History Of Northern Hemisphere Paleoclimatesmentioning

confidence: 97%

Variability of Cenozoic Norwegian-Greenland Sea Paleoceanography and Northern Hemisphere Paleoclimate

Thiede¹,

Eldholm²,

Taylor³

1989

Proceedings of the Ocean Drilling Program

View full text Add to dashboard Cite

The three drill sites of in the Norwegian Sea provided data to reconstruct the depositional paleoenvironment for the past 55 m.y. The three drill sites penetrated Paleogene and younger rocks and deposits on the Wring Plateau, but only upper Neogene and Quaternary sediments in the Wring Basin. The Neogene and Quaternary parts of the sedimentary sections can be correlated stratigraphically in detail to define gradients that existed between surface-and bottom-water properties and the influx of sedimentary components to this segment of the Norwegian con tinental margin.The Neogene and Quaternary deposits consist predominantly of fine-to medium-grained biogenic and terrigenous hemipelagic deposits that have been dated and correlated by a diversity of pelagic micro fossil groups, by magnetic methods, and by other stratigraphic tools. The sites are lithologically subdivided into an older Neogene section com posed of predominantly siliceous biogenic oozes (Sites 643 and 642), a transitional facies of upper Miocene and Plio cene sediments of alternating calcareous and siliceous ooze, and an upper Pliocene and Pleistocene sequence of glacialinterglacial mainly terrigenous deposits. The pelagic faunas and floras have many endemic characteristics from the Pa leogene and lower Neogene, whereas those of the upper Neogene and Quaternary can be correlated with pelagic floras and faunas from the North Atlantic basins. Floras with Pacific affinities appear just above the Miocene/Pliocene boundary and are interpreted to date the early evolution of the East Greenland Current system. Paleoclimatic evidence suggests that the subaerial central Wring Plateau was covered by dense vegetation growing in a moist and damp climate generating lateritic soils on the volcanic floor during the early Paleogene. The central Wring Plateau subsided since that time to its present intermediate depth, whereas the foot region of the Wring Plateau has been located in intermediate and deep waters since its formation. During Eocene and Oligocene the warm climate per sisted, though it was less moist than previously. Warm and damp conditions continued into the early Miocene but, dur ing the latest early Miocene, the climate changed from warm to temperate. Clay assemblages indicate a progressive cool ing to temperate conditions during the middle to late Miocene. From the latest Miocene through the Pliocene/Pleisto cene the climate progressively entered its glacial mode; during the past 2.6 m.y. it was characterized by alternating glacial/interglacial climatic episodes.Site 643, located near the western boundary of the Norwegian Current and Site 644 near its eastern boundary, pro vide a record of that current and influxes of shelf waters. After subsidence of the Wring Plateau, a continuous, pelagic, fully marine, depositional environment existed for the Eocene through Quaternary at Site 643 and the lower Eocene and the Neogene through Quaternary at Site 642. The pelagic faunas and floras suggest that the surface water stayed rela tively warm, at least...

show abstract

Late Cenozoic Arctic Ocean sea ice and terrestrial paleoclimate

Cited by 67 publications

References 0 publications

Leg 162: New Frontiers on Past Climates

Leg 162: New Frontiers on Past Climates

Scientific Prospectus: FY95 Program

Variability of Cenozoic Norwegian-Greenland Sea Paleoceanography and Northern Hemisphere Paleoclimate

Contact Info

Product

Resources

About