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Showing 1 to 20 of 142 for “"interglacial"”.
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Glacial-Interglacial Variability of Eastern Pacific Hydroclimate
… monsoonal rainfall was elevated during warm interglacials and suppressed during glacial periods. I additionally compare the proxy data to general circulation model simulations of the LGM and Last Interglacial (LIG; $\sim$117--130 ka) periods to investigate the effects of orbital forcing …
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Changes in Antarctic Bottom Water Formation During Interglacial Periods
… the modern Southern Ocean and during the last interglacial period, Marine Isotope Stage 5, there are observations that point to reduced Antarctic Bottom Water (AABW) formation. These reductions are believed to be driven by an increase in the strength of the Southern Ocean density stratification …
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An organic geochemical approach to problems of glacial-interglacial climatic variability
… to address problems of Late Quaternary glacial-interglacial climatic variability in a 208.7 m hydraulic piston core (DSDP 619) from the Pigmy Basin in the northern Gulf of Mexico. Paired analyses of δ13C-Corg and N/C are consistent with the hypothesis that the sedimentary organic carbon in the …
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Dating and Interpretation of Secondary Carbonate Deposits from the Last Interglacial
… suggest an unstable progression of the Last Interglacial, which terminated at 116 kyr. Thus, the classical Eemian lasted for about 10 kyr, which is the duration the Holocene has already reached. Another speleothem from Spannagel Cave formed during several warm periods of the past 250 kyr. The …
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An organic geochemical approach to problems of glacial-interglacial climatic variability
Thesis (Ph. D.)--Joint Program in Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 1988.
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Alterações atmosféricas e oceânicas durante o super-interglacial Marine Isotope Stage 31
Climas passados são ferramentas indispensáveis para o entendimento das projeções de clima futuro devido suas condições forcantes serem diferentes das condições atuais e futuras, devido a emissão antropogênica de gases de efeito estuda. Por meio da comparação entre simulações e reconstruções …
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Carbon isotope stratigraphy of the interglacial Umberatana Group, Adelaide, Fold Belt, South Australia / by Jamie M. Burgess.
This study demonstrates the need for refinement of the established approach to interbasin stratigraphic correlation based on C-isotope geochemistry. High data resolution is desirable and correlation should take into account lithostratigraphy and sequence stratigraphy rather than soley relying on …
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Glacial-interglacial variations of the water masses in the southeast Atlantic Ocean derived from foraminiferal neodymium isotope ratios
Variations in the global climate over time have long been associated with changes in the meridional overturning circulation of the oceans. It is now commonly believed that, during the Last Glacial Maximum (LGM), the transport of North Atlantic Deep Water (NADW) to the southeast Atlantic Ocean was …
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Stable isotope stratigraphy of deep-sea cores from the Southwest Pacific region: aspects of late Quaternary palaeoceanography
… on the latest Quaternary (stages 1 to 5) glacial-interglacial oscillations of the δ¹⁸O and δ¹³C record, and aspects of their palaeoceanographic significance. Some longer sequences of core were also studied. Of the Southwest Pacific Ocean cores, 594 yielded the most detailed record for the past …
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Central North Atlantic (IODP Site U1313) paleoceanography based on a high-resolution dinoflagellate cyst record across the Early–Middle Pleistocene boundary (Marine Isotope Stages 20–18, ~810–741 ka)
… waters at 790.5 ka. The onset of peak interglacial conditions at 790.5 ka is delayed relative to the benthic δ18O signal, which has a midpoint age for Termination IX at ~793 ka, and presumably reflects the persistence of ice sheets to the north. Peak interglacial conditions terminated …
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Ecology and climates of early Middle Pleistocene interglacials in Britain
… Middle Pleistocene (MIS 19-13, c. 780-430 ka) interglacial environments in Britain. This period is characterised by globally muted (i.e. low amplitude) glacial-interglacial cycles, which increased in amplitude c. 430 ka with the Mid-Brunhes Transition (MBT). However, the influence of these …
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Quaternary geology of the German North Sea and Western Irish Sea Mud Belt: revised stratigraphies, geotechnical properties, sedimentology and anthropogenic impacts
… characterised by fluctuation between glacial and interglacial periods leading to the present interglacial, the Holocene. In comparison to preceding periods it was believed the Holocene represented a time of relative climatic stability. However, recent work has shown that the Holocene can be …
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Seismic-stratigraphic analysis of shelf-margin delta/slope fan and basin floor fan on high-latitude and middle-latitude margins (Ross Sea, Weddell Sea and Alabama/West Florida shelf): Paleoclimatic and eustatic implications
… glacial periods (i.e., eustatic lowstands) and interglacial periods (i.e., eustatic highstands) on high-latitude and low-latitude margins. The high-latitude Antarctic margin is of particular interest because it is over-deepened and surrounds a continent that is free of melt-water. Because of …
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Insights into Glacial Terminations from a South Atlantic Perspective
… from a cold glacial climate state to a warm interglacial climate state. A key question in Quaternary climate science is understanding which feedbacks are important in regulating global climate on glacial-interglacial timescales. On this topic, the Southern Ocean has long been considered to be …
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EASTERN EQUATORIAL PACIFIC PRODUCTIVITY VIA TWO GEOCHEMICAL PROXIES
… while also comparing the sites’ glacial and interglacial productivity variations to the geochemistry and productivity results of an independent central equatorial pacific site. Phosphorus and other elemental data were collected from sites 845, 848, 849, and 853 (ODP Leg 138). Using a Ba/Ti …
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Ocean circulation and carbon cycle dynamics in the Pacific Southern Ocean during Late Pleistocene interglacials
… particularly for past warmer-than-present interglacial periods. This thesis takes advantage of high-resolution sediment material, retrieved during International Ocean Discovery Program Expedition 383 in the Pacific Southern Ocean at Sites U1540, U1542 and U1543, studying deep ocean …
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Using Nd Isotopes to understand changes in continental weathering flux in Mid-Pennsylvanian (Desmoinesian) carbonate cycles
… the cycles are dominated by highstand (or interglacial) deposition. Seventeen cycles were sampled (<0.5 m sample resolution) for Nd-isotope analysis of whole rock limestones. єNd values for all three locations range between -12.3 to -5.95 and two contrasting orbital-scale єNd trends are …
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Trace element distributions in ridge flank sediments from the east Pacific Rise, and their use as proxies of past ocean conditions
… transformation to<br/>goethite on glacial-interglacial timescales. This transformation is inferred to lead to P loss from the<br/>particulate/sediment phase. Uranium is highly enriched in sulphide rich EPR plume particles and<br/>the sediments at 14oS. U/Fe ratios indicate there has been …
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The marine geology of False Bay
… sea-level, is dated by the writer as of Great Interglacial age. It is pointed out that the Stellenbosch river terraces, dated by A. Krige (1927) as Last Interglacial, can in no way be related to this period. Evidence is presented which suggests that the 50 to 60 ft., 20 to 25 ft. and 10 to 14 …
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Innovative water tracers and water isotopes enhance Antarctic research with climate models
… palaeoclimate modelling on the early last interglacial (127 thousand years ago, ka). While marine sediment and ice core records suggest warmer Southern Ocean and Antarctica at 127 ka than preindustrial, state-of-the-art climate models do not reproduce the magnitude of warming when only …
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