The timing of major climate terminations

Paleoceanography - Tập 12 Số 4 - Trang 577-585 - 1997
Maureen E. Raymo1
1Department of Earth Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge

Tóm tắt

A simple, untuned “constant sedimentation rate” timescale developed using three radiometric age constraints and eleven δ18O records longer than 0.8 Myr provides strong support for the validity of the SPECMAP timescale of the late Quaternary [Imbrie et al., 1984]. In particular, the present study independently confirms the link between major deglaciations (terminations) and increases in northern hemisphere summer radiation at high latitudes and shows that this correlation is not an artifact of orbital tuning. In addition, the excess ice characteristic of late Quaternary “100‐kyr” climate cycles typically accumulates when July insolation at 65°N has been unusually low for more than a full precessional cycle, or >21 kyr, and once established does not last beyond the next increase in summer insolation. Thus, the timing of the growth and decay of large 100‐kyr ice sheets, as depicted in the deep sea δ18O record, is strongly (and semipredictably) influenced by eccentricity through its modulation of the orbital precession component of northern hemisphere summer insolation.

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Tài liệu tham khảo

10.1029/94PA00860

Berger A., Palaeoclimate sensitivity to CO2 and insolation, Ambio, 26, 32

Berger W. H., 1996, The Polar Oceans and Their Role in Shaping the Global Environment, Geophys. Monogr. Ser., 295

10.1130/0091-7613(1994)022<0463:QTSFTO>2.3.CO;2

Bickert T. W. B.Curry G.Wefer Late Pliocene to Holocene (2.6 – O Ma) western equatorial Atlantic deep water circulation: Inferences from benthic stable isotopes ODP Leg Proc. Ocean Drill. Program Sci. Results 154 154 edited byN. J.Shackleton et al. 1997.

10.1007/978-94-017-4841-4_14

Cheng H., 1996, Pa‐231 dating of carbonates using TIMS techniques (abstract), EOS Trans. AGU, 77, S168

Curry W. B., 1995, Proceedings of the Ocean Drilling Program, series‐numbered Initial Reports

10.1175/1520-0442(1991)004<0318:AODMOC>2.0.CO;2

10.1016/0012-821X(90)90066-7

10.1029/91PA00877

10.1130/0091-7613(1995)023<0403:ICRCOL>2.3.CO;2

10.1126/science.263.5148.796

10.1126/science.194.4270.1121

Henderson G., 1996, Direct U/Th dating of marine oxygenisotope substage‐5e in Bahamian sediments (abstract), Eos Trans. AGU, 77, S168

10.1130/DNAG-GNA-K3.183

10.1126/science.207.4434.943

Imbrie J., 1984, Milankovitch and Climate, Part 1, 269

10.1029/92PA02253

10.1029/93PA02751

Laskar J., 1993, Orbital, precessional and insolation quantities for the Earth from ‐20 Myrto +10 Myr, Astron. Astrophys., 270, 522

10.1029/95GL03027

10.1038/358397a0

Mix A. C., 1995, Benthic foraminiferal stable isotope record form Site 849, 0–5 Ma: Local and global climate changes, Proc. Ocean Drill. Program. Sci. Results, 371

Mix A. C., 1995, Benthic foraminiferal stable isotope stratigraphy of Site 846: 0–1.8 Ma, Proc. Ocean Drill. Program Sci. Results, 839

10.1038/377107b0

10.1016/0012-821X(81)90197-7

10.1029/94PA00289

10.1130/0091-7613(1988)016<0649:IOLCMB>2.3.CO;2

Ruddiman W. F., 1986, Sediment disturbance and correlation of offset holes drilled with the hydraulic piston corer, Initial Rep. Deep Sea Drill. Proj., 94, 615

10.1029/PA004i004p00353

10.1029/94PA02289

10.1130/MEM145-p449

10.1017/S0263593300020782

10.1016/0012-821X(96)00030-1

10.1029/94PA00208

10.1017/S0022143000023327

10.1126/science.258.5080.255

Winograd I. J., 1996, High resolution δ18O record from Devil's Hole, Nevada, for the period 80 to 19 Ka (abstract), Eos Trans. AGU, 77, S169

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Paleoceanography

Tập 12 Số 4

577-585

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