Magnitudes of sea-level lowstands of the past 500,000 years

Rohling, Eelco J.; Fenton, M.M.; Jorissen, Frans; Bertrand, Philìppe; Ganssen, G.M.; Caulet, J.

doi:10.1038/28134

Cited by 562 publications

(382 citation statements)

References 17 publications

(2 reference statements)

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“…The minimum highest sea-level altitude estimated to System II is 9.5 ± 1 m, to System III is 7.7 ± 1 m, and to System IV is 3 ± 1 m. Rohling et al (1998) and Rabineau et al (2006) established magnitudes of lowstands to the past 500 kyr. Considering the correlation with oxygen isotope stages to determine the age of sequences lowstand, it is possible to determine that sea level was more than 100 m below its current position during each lowstand (Fig.…”

Section: Discussionmentioning

confidence: 94%

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High-Frequency Sequences in the Quaternary of Pelotas Basin (coastal plain): a record of degradational stacking as a function of longer-term base-level fall

Rosa

Barboza

Abreu³

et al. 2017

Braz. J. Geol.

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ABSTRACT:The aim of this work was to analyze the sedimentary record of the coastal plain of Pelotas Basin, placing it in the context of temporal and spatial scales, and proposing a stratigraphic hierarchical framework. The coastal plain, located in southern Brazil and in northern Uruguay, is mainly formed by four Quaternary barrier-lagoon systems. Three of these systems were studied through the integration of surface and subsurface data (geomorphological and topographical mapping, outcrops description, geoprocessing, dating and Ground Penetrating Radar -GPR -records) and interpreted as the preserved, onshore portion of depositional sequences mainly controlled by glacioeustatic cycles of about 100 kyr. The stacking pattern comprising these sequences is progradational with seaward downsteping (highest sea-levels measured: 9.5, 8 and 3 m, respectively), comprehending a degradational sequence set, or the regressive/ falling stage systems tract of a higher order depositional sequence identified in seismic sections, with about 0.5 Ma. The youngest sequence has diachronous systems tracts -while some sectors have already transitioned from the transgressive to the highstand/falling stage systems tract, others are still under a transgressive context. It indicates that, in this time and scale, the sea level is not the main control of coastal evolution, and autogenic factors are fundamental in the run of geological record. KEYWORDS:Barrier-Lagoon; Glacioeustasy; Diachronism of Systems Tracts; Ground Penetrating Radar; Rio Grande do Sul coastal evolution. RESUMO:

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Section: Discussionmentioning

confidence: 94%

“…The altitudes of sea-level highs are defined through topographic measurements from this work, Tomazelli and Dillenburg (2007), and Lopes et al (2014). The amplitudes of lowstands are from Rohling et al (1998).…”

Section: High-frequency Sedimentary Record: Barrier-lagoon Systemsmentioning

confidence: 99%

High-Frequency Sequences in the Quaternary of Pelotas Basin (coastal plain): a record of degradational stacking as a function of longer-term base-level fall

Rosa

Barboza

Abreu³

et al. 2017

Braz. J. Geol.

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“…An exception is Site 980 which shows very similar SST values for MIS 1 and MIS 11 (McManus et al, 1999). However, the method of SST estimates employed in that latter study involved changes in global ice volume which might have introduced further uncertainties, as different ice-volume reconstructions show controversial results for MIS 11 (Rohling et al, 1998;Hearty et al, 1999;McManus et al, 2003;Kandiano and Bauch, 2007). Our data show that the SST optimum in the subtropical as well as in the middle latitudes was reached during the late phase which is consistent with previously published foraminiferal and alkenone SST data of MIS 11c from the wider North Atlantic region (de Abreu et al, 2005;Martrat et al, 2007;Stein et al, 2009;Rodrigues et al, 2011;Stein et al, 2009) .…”

Section: Dynamics Of Sea-surface Properties In the Lower Latitudesmentioning

confidence: 93%

The meridional temperature gradient in the eastern North Atlantic during MIS 11 and its link to the ocean–atmosphere system

Kandiano

Bauch

Fahl

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

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Temporal and spatial patterns in eastern North Atlantic sea-surface temperatures (SST) were reconstructed for marine isotope stage (MIS) 11c using a submeridional transect of five sediment cores. The SST reconstructions are based on planktic foraminiferal abundances and alkenone indices, and are supported by benthic and planktic stable isotope measurements, as well as by ice-rafted debris content in polar and middle latitudes. Additionally, the larger-scale dynamics of the precipitation regime over northern Africa and the western Mediterranean region was evaluated from iron concentrations in marine sediments off NW Africa and planktic δ 13 C in combination with analysis of planktic foraminiferal abundances down to the species level in the Mediterranean Sea. Compared to the modern situation, it is revealed that during entire MIS 11c sensu stricto (ss), i.e., between 420 and 398 ka according to our age models, a cold SST anomaly in the Nordic seas co-existed with a warm SST anomaly in the middle latitudes and the subtropics, resulting in steeper meridional SST gradients than during the Holocene. Such a SST pattern correlates well with a prevalence of a negative mode of the modern North Atlantic Oscillation. We suggest that our scenario might partly explain the longer duration of wet conditions in the northern Africa during MIS 11c compared to the Holocene.

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“…Moreover, the aplanktonic LGM Red Sea conditions offer strong independent evidence that LGM sea level was lower than in the PGM. It formed under extreme salinities (S ¼~50 to~70) due to near-isolation of the Red Sea from the world ocean by the shallow Hanish Sill, Bab-elMandab Strait (~137 m deep, relative to an LGM global mean sealevel drop of~130 m); such extreme conditions were not reached during the PGM (Rohling et al, 1998;Fenton et al, 2000;Siddall et al, 2003). This implies either that: (a) the sill was uplifted between the PGM and LGM; and/or (b) sea level dropped more during the LGM than the PGM.…”

Section: Denton and Hughes 2002mentioning

confidence: 99%

“…Even for the PGM, information is so limited that studies often invoke an LGM-like ice volume (e.g., Lambeck and Chappell, 2001;Yokoyama and Esat, 2011). Initial assessment of Red Sea glacial sea-level lowstands seemed to support that view (Rohling et al, 1998), but only constrained the LGM sea-level drop to have been at least as low as that of the PGM, without giving a maximum value. Here we show that subsequent improvements to the Red Sea record firmly indicate a greater sea-level drop during the LGM than during the PGM.…”

Section: Introductionmentioning

confidence: 99%

Differences between the last two glacial maxima and implications for ice-sheet, δ18O, and sea-level reconstructions

Rohling

Hibbert

Williams

et al. 2017

Quaternary Science Reviews

115

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Arctic ice shelf Last Interglacial Glacioisostatic adjustment a b s t r a c t Studies of past glacial cycles yield critical information about climate and sea-level (ice-volume) variability, including the sensitivity of climate to radiative change, and impacts of crustal rebound on sealevel reconstructions for past interglacials. Here we identify significant differences between the last and penultimate glacial maxima (LGM and PGM) in terms of global volume and distribution of land ice, despite similar temperatures and radiative forcing. Our analysis challenges conventional views of relationships between global ice volume, sea level, seawater oxygen isotope values, and deep-sea temperature, and supports the potential presence of large floating Arctic ice shelves during the PGM. The existence of different glacial 'modes' calls for focussed research on the complex processes behind ice-age development. We present a glacioisostatic assessment to demonstrate how a different PGM ice-sheet configuration might affect sea-level estimates for the last interglacial. Results suggest that this may alter existing last interglacial sea-level estimates, which often use an LGM-like ice configuration, by several metres (likely upward).

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Magnitudes of sea-level lowstands of the past 500,000 years

Cited by 562 publications

References 17 publications

High-Frequency Sequences in the Quaternary of Pelotas Basin (coastal plain): a record of degradational stacking as a function of longer-term base-level fall

High-Frequency Sequences in the Quaternary of Pelotas Basin (coastal plain): a record of degradational stacking as a function of longer-term base-level fall

The meridional temperature gradient in the eastern North Atlantic during MIS 11 and its link to the ocean–atmosphere system

Differences between the last two glacial maxima and implications for ice-sheet, δ18O, and sea-level reconstructions

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