Origin of the northern Atlantic's Heinrich events

Broecker, Wallace S.; Bond, Gérard C.; Klas, Mieczyslawa; Clark, Elizabeth; McManus, Jerry F

doi:10.1007/bf00193540

Cited by 556 publications

(308 citation statements)

References 8 publications

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“…The newly formed NADW flows southward within the deep western basin of the Atlantic Ocean. The formation of NADW is crucial in order to maintain the global thermohaline circulation overturning and deep ocean ventilation processes in the subpolar Atlantic (Broecker et al 1992). In the modern hydrographic setting, NADW fills the depth range between 1000 and 4000 m. Depending on the origin of its formation, NADW is subdivided into two water masses, with depths above 2000 m occupied by the Upper NADW (UNADW) and beneath 2000 m by the Lower NADW (LNADW).…”

Section: Modern Deep Atlantic Water Mass Distributionmentioning

confidence: 99%

Insights into North Atlantic deep water formation during the peak interglacial interval of Marine Isotope Stage 9 (MIS 9)

Mokeddem

McManus

2017

Clim Dyn

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Section: Modern Deep Atlantic Water Mass Distributionmentioning

confidence: 99%

Insights into North Atlantic deep water formation during the peak interglacial interval of Marine Isotope Stage 9 (MIS 9)

Mokeddem

McManus

2017

Clim Dyn

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“…This suggests that conditions were relatively moist during the late MIS 5, 4, and early MIS 3. The first layer of gypsum and halite occurred at 53.2 to 52.1 ka (51.59 to 49.93 m) and may have been deposited at the same time as the Heinrich event 5 (Broecker et al, 1992;Guo et al, 1996), although the resolution of the ISL1A chronology model is low and there is high dating uncertainty in this interval. The onset of evaporate during this period signifies lowstand of the lake and relatively dry conditions in the basin.…”

Section: Lithology-inferred Climatementioning

confidence: 99%

A 94–10ka pollen record of vegetation change in Qaidam Basin, northeastern Tibetan Plateau

Wei

Fan

Zhao

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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Drill core (ISL1A) was obtained from the Qarhan Salt Lake in central eastern Qaidam Basin, northeastern Tibetan Plateau (NE TP). Fossil pollen and the lithology of the core sediment were analyzed in conjunction with AMS 14 C and 230 Th dating. The results indicated that Artemisia and Chenopodiaceae dominated the steppe/desert steppe vegetation developed around the lake between 94 and 51.2 ka, corresponding with the organic-rich silty clay deposited in the core sediments. Pediastrum continuously appeared in the core sediments between 94 and 51.2 ka, indicating freshwater to oligohaline conditions of the paleo-Qarhan Lake during the late marine isotope stage (MIS) 5, MIS 4, and early MIS 3. During the 51.2 to 32.5 ka period, Ephedra dominated shrub-desert vegetation expanded in the basin, while, Pediastrum disappeared in the core sediments. The core sediments consisted of interbedded layers of halite silt and clay-rich halite between 51.2 and 32.5 ka, signifying a shift toward drier hydrologic conditions. Thus, the paleo-Qarhan Lake experienced periods of desiccation and shallow water levels. Artemisia and Chenopodiaceae dominated steppe/desert steppe vegetation appeared again from 32.5 to 25.3 ka, with clay-rich sediments in the core, thereby suggesting an increase of runoff from the lake under relatively wetter climatic conditions. Since 25.3 ka, however, pollen concentrations declined, corresponding with the amount of halite deposited in the core sediment and, suggesting a cold, dry climatic condition during MIS2. Our findings have important implications for understanding complex regional vegetation and climatic responses to large-scale forcings in the Qaidam Basin.

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“…In addition to good resolution of features in its oxygen isotopic profiles, core 5K possesses distinct cotrelatable horizons such as the Vedde Ash and deposits of the latest four icerafting pulses known as "Heinrich events" [Heinrich, 1988;Broecker et al, 1992]. The AMS dates on BOFS 5K are shown in Table 2, and plotted against depth downcore in Figure 1.…”

Section: Ams Datingmentioning

confidence: 99%

“…In the core descriptions, it is clear that they correspond to gravel-rich layers, sometimes several centimetres thick, which represent peaks of ice-rafted detritus ("Heinrich layers" [Heinrich, 1988;Broecker et al, 1992]). …”

Section: X-radiographymentioning

confidence: 99%

Chronology for climate change: Developing age models for the biogeochemical ocean flux study cores

Manighetti¹,

McCave²,

Maslin³

et al. 1995

Paleoceanography

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Abstract. We construct age models for a suite of cores from the northeast Atlantic Ocean by means of accelerator mass spectrometer dating of a key core, BOFS 5K, and correlation with the rest of the suite. The effects of bioturbation and foraminiferal species abundance gradients upon the age record are modeled using a simple equation. The degree of bioturbation is estimated by comparing modeled profiles with dispersal of the Vedde Ash layer in core 5K, and we find a mixing depth of roughly 8 cm for sand-sized material. Using this value, we estimate that age offsets between unbioturbated sediment and some foraminifera species after mixing may be up to 2500 years, with lesser effect on fine carbonate (< 10 •m) ages. The bioturbation model illustrates problems associated with the dating of "instantaneous" events such as ash layers and the "Heinrich" peaks of ice-rafted detritus. Correlations between core 5K and the other cores from the BOFS suite are made on the basis of similarities in the downcore profiles of oxygen and carbon isotopes, magnetic susceptibility, water and carbonate content, and via marker horizons in X radiographs and ash beds.

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Origin of the northern Atlantic's Heinrich events

Abstract: As first noted by Heinrich, 1988, glacial age

Cited by 556 publications

References 8 publications

Insights into North Atlantic deep water formation during the peak interglacial interval of Marine Isotope Stage 9 (MIS 9)

Insights into North Atlantic deep water formation during the peak interglacial interval of Marine Isotope Stage 9 (MIS 9)

A 94–10ka pollen record of vegetation change in Qaidam Basin, northeastern Tibetan Plateau

Chronology for climate change: Developing age models for the biogeochemical ocean flux study cores

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