North Atlantic ocean circulation and abrupt climate change during the last glaciation

Henry, L. Gene; McManus, Jerry F; Curry, William B; Roberts, Natalie L; Piotrowski, Alexander M; Keigwin, Lloyd D

doi:10.1126/science.aaf5529

Cited by 319 publications

(359 citation statements)

References 55 publications

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“…1), the Cariaco Basin reflectance influenced by movements of the Intertropical Convergence Zone (43), and the Bermuda Rise calcium concentration influenced by the Atlantic Meridional Overturning Circulation (44) (Fig. 4).…”

Section: Discussionmentioning

confidence: 99%

The impact of Last Glacial climate variability in west-European loess revealed by radiocarbon dating of fossil earthworm granules

Moine

Antoine

Hatté

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

103

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The characterization of Last Glacial millennial-timescale warming phases, known as interstadials or Dansgaard-Oeschger events, requires precise chronologies for the study of paleoclimate records. On the European continent, such chronologies are only available for several Last Glacial pollen and rare speleothem archives principally located in the Mediterranean domain. Farther north, in continental lowlands, numerous high-resolution records of loess and paleosols sequences show a consistent environmental response to stadial-interstadial cycles. However, the limited precision and accuracy of luminescence dating methods commonly used in loess deposits preclude exact correlations of paleosol horizons with Greenland interstadials. To overcome this problem, a radiocarbon dating protocol has been developed to date earthworm calcite granules from the reference loess sequence of Nussloch (Germany). Its application yields a consistent radiocarbon chronology of all soil horizons formed between 47 and 20 ka and unambiguously shows the correlation of every Greenland interstadial identified in isotope records with specific soil horizons. Furthermore, eight additional minor soil horizons dated between 27.5 and 21 ka only correlate with minor decreases in Greenland dust records. This dating strategy reveals the high sensitivity of loess paleoenvironments to Northern Hemisphere climate changes. A connection between loess sedimentation rate, Fennoscandian ice sheet dynamics, and sea level changes is proposed. The chronological improvements enabled by the radiocarbon "earthworm clock" thus strongly enhance our understanding of loess records to a better perception of the impact of Last Glacial climate changes on European paleoenvironments

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Section: Discussionmentioning

confidence: 99%

The impact of Last Glacial climate variability in west-European loess revealed by radiocarbon dating of fossil earthworm granules

Moine

Antoine

Hatté

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

103

View full text Add to dashboard Cite

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“…Recent investigations in West Antarctic Ice Sheet Divide (WAIS) ice core (Buizert et al, 2015) have demonstrated the north-to-south-directed transfer of the abrupt changes with Greenland warmings leading Antarctic coolings; the associated heat transfer is argued to be modulated by the Atlantic Meridional Overturning Circulation rather than by the atmosphere (Henry et al, 2016). Although the origin of the DO events is not yet elucidated, the North Atlantic changes still remain the drivers of those observed over Eurasia.…”

Section: Discussionmentioning

confidence: 99%

“…Ice cores nevertheless provide much more information than on temperature and dust concentration only, as they release records of numerous components of the climate system, isotope values of the transported water vapor, mineral aerosols and greenhouse gas concentrations, chemical elements, etc., which show different origins and transport patterns to the high-latitude ice sheets. Such richness in proxies allows comparisons with other records of millennial-scale variability preserved in both marine (Henry et al, 2016) and terrestrial deposits, as well as in other ice cores (Barbante et al, 2006;Buizert et al, 2015). In this paper, after briefly describing the abrupt changes observed in the very-high-resolution δ 18 O and dust records from NGRIP (NGRIP, 2004), we compare the dust particle sedimentation rates over Europe and China as expressed in key loess sequences (Fig.…”

Section: Introductionmentioning

confidence: 99%

Eurasian contribution to the last glacial dust cycle: how are loess sequences built?

et al. 2017

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Abstract. The last 130 000 years have been marked by pronounced millennial-scale climate variability, which strongly impacted the terrestrial environments of the Northern Hemisphere, especially at middle latitudes. Identifying the trigger of these variations, which are most likely associated with strong couplings between the ocean and the atmosphere, still remains a key question. Here, we show that the analysis of δ 18 O and dust in the Greenland ice cores, and a critical study of their source variations, reconciles these records with those observed on the Eurasian continent. We demonstrate the link between European and Chinese loess sequences, dust records in Greenland, and variations in the North Atlantic sea ice extent. The sources of the emitted and transported dust material are variable and relate to different environments corresponding to present desert areas, but also hidden regions related to lower sea level stands, dry rivers, or zones close to the frontal moraines of the main Northern Hemisphere ice sheets. We anticipate our study to be at the origin of more sophisticated and elaborated investigations of millennial and sub-millennial continental climate variability in the Northern Hemisphere.

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“…It has long been recognized that during stadials and glacial maxima marine ice-sheets and icy fresh water masses may have been associated with diminished heat transport to the high latitude North Atlantic (Broecker and Denton 1989;Raymo et al 1990;Imbrie et al 1992;Henry et al 2016). In addition, each major ice sheet collapse was associated with the release of, abundant icebergs that drifted southward and melted primarily in the subpolar Atlantic (Ruddiman 1977;Heinrich 1988;Broecker et al 1992; McManus et al , 1999Hemming 2004;Naafs et al 2013).…”

Section: Glacial/interglacial Deep Atlantic Water 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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North Atlantic ocean circulation and abrupt climate change during the last glaciation

Abstract: The most recent ice age was characterized by rapid and hemispherically 11

Cited by 319 publications

References 55 publications

The impact of Last Glacial climate variability in west-European loess revealed by radiocarbon dating of fossil earthworm granules

The impact of Last Glacial climate variability in west-European loess revealed by radiocarbon dating of fossil earthworm granules

Eurasian contribution to the last glacial dust cycle: how are loess sequences built?

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

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