Synchronizing a sea-level jump, final Lake Agassiz drainage, and abrupt cooling 8200years ago

Li, Yong-Xiang; Törnqvist, Torbjörn E.; Nevitt, J. M.; Kohl, Barry

doi:10.1016/j.epsl.2011.05.034

Cited by 62 publications

(56 citation statements)

References 41 publications

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“…Although the amplitude varies between these records, the consistent timing of these records suggests that this rapid sea‐level rise might be related to the same cause. A pulse‐like sea‐level rise has been observed at the Rhine–Meuse Delta between 8.8 and 8.2 ka (Hijma and Cohen, ) and the Mississippi Delta (Li et al ., ). The sea‐level jumps of the Rhine–Meuse and Mississippi Deltas have been associated with multiple drainage events of Lake Agassiz–Ojibway that preceded the 8.2 ka climatic cooling (Törnqvist and Hijma, ).…”

Section: Discussionmentioning

confidence: 97%

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Rapid flooding of the southern Vietnam shelf during the early to mid‐Holocene

Tjallingii

Stattegger

Stocchi

et al. 2014

J Quaternary Science

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A new sea-level record derived from coastal deposits of the South Vietnam shelf covers the deglacial sea-level history between 13.0 and 9.0 ka BP. This record reveals a relatively constant rate of sea-level rise and matches well with model results based on the RSES-ANU global ice-sheet model. However, the sea-level observations reveal a significant discrepancy with model results based on the ICE-5G global ice-sheet model, which further questions the existence of Meltwater Pulse 1B The incised-valley deposits of the South Vietnam shelf also complete the deglacial coastal evolution of southern Vietnam. The regional sea-level records of the South Vietnam shelf, the Mekong Delta and the Cambodian lowlands reveal an offset of about 18 m between 9.0 and 8.2 ka BP. The shoreline retreat of more than 200 km related to this offset was mainly caused by the differential hydro-isostatic adjustment between the South Vietnam shelf and the Cambodian lowlands. However, the GIAmodel results cannot fully explain this fast relative sea-level rise due to the topographic changes and, possibly, alternative melt-water sources not accounted for in the current models.

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Section: Discussionmentioning

confidence: 97%

“…The period from 9.0–8.2 ka BP coincides with the final melting phase of the North American sheets and the multiple drainage events of Lake Agassiz‐Ojibway that preceded the 8.2 ka cooling event (Törnqvist and Hijma, ). This event caused a eustatic sea‐level rise of 0.8–2.2 m (Li et al ., ) and an additional GIA fingerprint.…”

Section: Discussionmentioning

confidence: 97%

Rapid flooding of the southern Vietnam shelf during the early to mid‐Holocene

Tjallingii

Stattegger

Stocchi

et al. 2014

J Quaternary Science

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“…As Arbic et al [2007] and others have discussed, the Hudson Strait was closed off prior to roughly 9 ka. A more precise age constraint of 8.31 to 8.18 ka was recently provided by Li et al [2011]. The hypothesis is therefore that the unavailability of this dissipation site at earlier times resulted in much larger tidal amplitudes elsewhere.…”

Section: Discussionmentioning

confidence: 97%

High-resolution numerical modeling of tides in the western Atlantic, Gulf of Mexico, and Caribbean Sea during the Holocene

et al. 2011

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[1] Tidal constituents and datums are computed on a high resolution grid of the northwestern Atlantic Ocean, including the Gulf of Mexico and the Caribbean Sea. A global model is used to determine tidal parameters on a grid with a nominal resolution of 800 × 800. The global model includes self-attraction and loading, drag in shallow marginal seas, and internal tide drag in the deep ocean. Simulations are performed at 1000 year intervals during the Holocene (10,000 calibrated years before present (10 ka)) in combination with changes in bathymetry and coastline location derived from a glacial isostatic adjustment model. The global model results are then used to force a regional barotropic tidal model. The regional model uses an unstructured finite element grid, with very high resolution at the coastline. The model results reveal significant variations in tidal constituent amplitudes throughout the Holocene. In the northwestern Atlantic, semi-diurnal components show a strong amplification at around 9 ka while in the Gulf of Mexico, the response is much more muted. Variations in diurnal tidal parameters are found to be less significant than semi-diurnal parameters throughout the model domain. Changes in tidal range, of great relevance to changes in relative sea level (RSL), are also investigated throughout the Holocene. The overall structure is similar to the patterns observed in the M 2 tide, with peak increases of 200-300%, relative to present-day, being observed along the east coast of the United States from 9 to 8 ka. Finally, the high spatial resolution of the regional model allows for the investigation of tidal changes at spatial scales (e.g., individual bays) much smaller than in previous studies.

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“…Using peat deposits from the Mississippi River delta (US), Li et al (2012) reconstructed a total eustatic sea level rise of 0.8 to 2.2 m at 8.2 ka. Another reconstruction from the Rhine-Meuse delta (the Netherlands and Belgium) implies a sea level rise of 3.0 ± 1.2 m (Hijma and Cohen, 2010).…”

Section: Discussionmentioning

confidence: 99%

Model sensitivity to North Atlantic freshwater forcing at 8.2 ka

Morrill

LeGrande

Renssen³

et al. 2013

Clim. Past

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We compared four simulations of the 8.2 ka event to assess climate model sensitivity and skill in responding to North Atlantic freshwater perturbations. All of the simulations used the same freshwater forcing, 2.5 Sv for one year, applied to either the Hudson Bay (northeastern Canada) or Labrador Sea (between Canada's Labrador coast and Greenland). This freshwater pulse induced a decadal-mean slowdown of 10–25% in the Atlantic Meridional Overturning Circulation (AMOC) of the models and caused a large-scale pattern of climate anomalies that matched proxy evidence for cooling in the Northern Hemisphere and a southward shift of the Intertropical Convergence Zone. The multi-model ensemble generated temperature anomalies that were just half as large as those from quantitative proxy reconstructions, however. Also, the duration of AMOC and climate anomalies in three of the simulations was only several decades, significantly shorter than the duration of ~150 yr in the paleoclimate record. Possible reasons for these discrepancies include incorrect representation of the early Holocene climate and ocean state in the North Atlantic and uncertainties in the freshwater forcing estimates

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Synchronizing a sea-level jump, final Lake Agassiz drainage, and abrupt cooling 8200years ago

Cited by 62 publications

References 41 publications

Rapid flooding of the southern Vietnam shelf during the early to mid‐Holocene

Rapid flooding of the southern Vietnam shelf during the early to mid‐Holocene

High-resolution numerical modeling of tides in the western Atlantic, Gulf of Mexico, and Caribbean Sea during the Holocene

Model sensitivity to North Atlantic freshwater forcing at 8.2 ka

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