Climatic “pause” during Termination II identified in shallow and intermediate waters off the Iberian margin

Gouzy, Aurélien; Malaizé, Bruno; Pujol, Claude; Charlier, Karine

doi:10.1016/j.quascirev.2004.03.002

Cited by 26 publications

(15 citation statements)

References 33 publications

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“…Such values are improbable at this time. For example, there is no North Atlantic record showing interglacial equivalent warmth right after the last glacial inception [e.g., Sanchez Goni et al ,1999; Gouzy et al , 2004].…”

Section: Resultsmentioning

confidence: 99%

Chronology reconstruction for the disturbed bottom section of the GISP2 and the GRIP ice cores: Implications for Termination II in Greenland

Suwa¹,

Fischer²,

Bender³

et al. 2006

J. Geophys. Res.

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[1] We have reconstructed chronology for the disturbed bottom parts of the GRIP and GISP2 ice cores using the combined paleoatmospheric records of CH 4 concentration and d18 O atm in the trapped gases. Our reconstructed ages for basal ice samples are based on comparison of published measurements of CH 4 and d18 O atm from the disturbed section of the GRIP and GISP2 cores with the same properties in the Vostok ice core. NGRIP d18 O ice values are also used to constrain the chronology during the end of marine isotope stage 5e. For each sample, we assign an age that represents the unique or most probable time of gas trapping, given its gas composition. Of 157 samples with CH 4 and d 18 O atm data, 10 give unique ages. Twenty-five newly measured values of the triple isotope composition of O 2 from the disturbed section of the GISP2 core add a third time-dependent gas property that agrees with our reconstruction. Our reconstruction supports earlier conclusions of Landais et al. (2003) that the disturbed section primarily includes ice from the last interglacial (MIS 5e) and the penultimate glacial period (MIS 6). The oldest ice in the basal layer of GISP2 and GRIP has an age !237 ka. The climate history we derive suggests that the last interglacial at Summit, Greenland, around 127 ka was slightly warmer than the current interglacial period. Reduction of various ion concentrations in ice and thickening of the ice sheet during Termination II was similar to that in Termination I.Citation: Suwa, M., J. C. von Fischer, M. L. Bender, A. Landais, and E. J. Brook (2006), Chronology reconstruction for the disturbed bottom section of the GISP2 and the GRIP ice cores: Implications for Termination II in Greenland,

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Section: Resultsmentioning

confidence: 99%

Chronology reconstruction for the disturbed bottom section of the GISP2 and the GRIP ice cores: Implications for Termination II in Greenland

Suwa¹,

Fischer²,

Bender³

et al. 2006

J. Geophys. Res.

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“…(d) ODP976 δ 18O sw profile calculated from δ 18 O ivc and Mg/Ca temperatures shown in Figures b and c. (e) G. bulloides Mg/Ca temperature profile of core MD99‐2331 from the western Iberian margin [ Skinner et al , ] using the age model of Gouzy et al [] and Sánchez‐Goñi et al []. (f) Speleothem δ 18 O profile from Dongge Cave [ Dykoski et al , ].…”

Section: Discussionmentioning

confidence: 98%

Offset timing of climate oscillations during the last two glacial‐interglacial transitions connected with large‐scale freshwater perturbation

Jimenez-Amat

Zahn

2015

Paleoceanography

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Th-dated speleothem timescale to ODP976 suggests glacial conditions in the Northeast Atlantic region were terminated abruptly and interglacial warmth was reached in less than a millennium. The early-MIS5e cooling and freshening at ODP976 coincided with similar changes at North Atlantic sites suggesting this was a basin-wide event. By analogy with T1, we argue that this was a YD-type event that was shifted into the early stages of the last interglacial period. This scenario is consistent with evidence from northern North Atlantic and Nordic Sea sites that the continuing disintegration of the large Saalian Stage (MIS6) ice sheet in Eurasia delayed the advection of warm North Atlantic waters and full-strength convective overturn until later stages of MIS5e.

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“…1987), as well as in other reconstructions (e.g., Sarnthein & Tiedemann 1990). More recent studies of the step‐like appearance speak of a “pause” in the overall deglacial process (e.g., Gouzy et al. 2004; Riesebrobakken et al.…”

Section: Discussionmentioning

confidence: 99%

A “critical” climatic evaluation of last interglacial (MIS 5e) records from the Norwegian Sea

Bauch

Erlenkeuser

2008

Polar Research

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Sediment cores from the Norwegian Sea were studied to evaluate interglacial climate conditions of the marine isotope stage 5e (MIS 5e). Using planktic forminiferal assemblages as the core method, a detailed picture of the evolution of surface water conditions was derived. According to our age model, a step‐like deglaciation of the Saalian ice sheets is noted between ca. 135 and 124.5 Kya, but the deglaciation shows little response with regard to surface ocean warming. From then on, the rapidly increasing abundance of subpolar forminifers, concomitant with decreasing iceberg indicators, provides evidence for the development of interglacial conditions sensu stricto (5e‐ss), a period that lasted for about 9 Ky. As interpreted from the foraminiferal records, and supported by the other proxies, this interval of 5e‐ss was in two parts: showing an early warm phase, but with a fresher, i.e., lower salinity, water mass, and a subsequent cooling phase that lasted until ca. 118.5 Kya. After this time, the climatic optimum with the most intense advection of Atlantic surface water masses occurred until ca. 116 Kya. A rapid transition with two notable climatic perturbations is observed subsequently during the glacial inception. Overall, the peak warmth of the last interglacial period occurred relatively late after deglaciation, and at no time did it reach the high warmth level of the early Holocene. This finding must be considered when using the last interglacial situation as an analogue model for enhanced meridional transfer of ocean heat to the Arctic, with the prospect of a future warmer climate.

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Climatic “pause” during Termination II identified in shallow and intermediate waters off the Iberian margin

Cited by 26 publications

References 33 publications

Chronology reconstruction for the disturbed bottom section of the GISP2 and the GRIP ice cores: Implications for Termination II in Greenland

Chronology reconstruction for the disturbed bottom section of the GISP2 and the GRIP ice cores: Implications for Termination II in Greenland

Offset timing of climate oscillations during the last two glacial‐interglacial transitions connected with large‐scale freshwater perturbation

A “critical” climatic evaluation of last interglacial (MIS 5e) records from the Norwegian Sea

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