Asynchrony of Antarctic and Greenland climate change during the last glacial period

Blunier, Thomas; Chappellaz, J.; Schwander, Jakob; Dällenbach, A.; Stauffer, B.; Stocker, Thomas F.; Raynaud, Dominique; Jouzel, Jean; Clausen, Henrik; Hammer, C. U.; Johnsen, S. J.

doi:10.1038/29447

Cited by 743 publications

(543 citation statements)

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“…The new data, spanning the period from 27.7 to 44.8 kyr BP, show a marked positive peak in the deuterium pro¢le centred at about 37.5^38 kyr BP. This event, referred to as A1, has already been observed in other Antarctic ice core records [5] and it can be inferred that the very bottom of the EDC96 core, i.e. from 43.6 to 44.8 kyr BP, corresponds to the end of oscillation A2, as now fully con¢rmed from data obtained on the EDC99 core [41].…”

Section: Data Ice Core Chronology and Comparison With Other Isotopicmentioning

confidence: 73%

“…For instance, this late glacial period has been the initial focus of studies dealing with the rapid changes documented in Central Greenland ice cores [9,10] and of their correlation with the Antarctic records [5]. The ¢rst correlation between the rapid climate changes recorded in ice cores [11,12] (the Dansgaard/Oeschger or D/ O events) and in deep-sea cores (the Heinrich events) was also established for this time period [1].…”

Section: Introductionmentioning

confidence: 99%

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A late-glacial high-resolution site and source temperature record derived from the EPICA Dome C isotope records (East Antarctica)

Stenni¹,

Jouzel²,

Masson‐Delmotte³

et al. 2004

Earth and Planetary Science Letters

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The timing and synchronisation of Greenland and Antarctic climate events that occurred during the last glacial period are still under debate, as is the magnitude of temperature change associated with these events. Here we present detailed records of local and moisture-source temperature changes spanning the period 27^45 kyr BP from water stable isotope measurements (ND and N 18 O) in the recently drilled EPICA Dome C ice core, East Antarctic plateau. Using a simple isotopic model, site (vT site ) and source (vT source ) temperatures are extracted from the initial 50-yr highresolution isotopic records, taking into account the changes in seawater isotopic composition. The deuterium isotope variability is very similar to the less precise ND record from the Vostok ice core, and the site temperature inversion leads to a temperature profile similar to the classical palaeothermometry method, due to compensations between source and ocean water corrections. The reconstructed vT site and vT source profiles show different trends during the glacial: the former shows a decreasing trend from the warm A1 event (38 kyr BP) toward the Last Glacial Maximum, while the latter shows increasing values from 41 to 28 kyr BP. The low-frequency deuterium excess fluctuations are strongly influenced by obliquity fluctuations, controlling the low-to high-latitude temperature gradients, and show a remarkable similarity with a high-resolution southeast Atlantic sea surface temperature record. A comparison of the temperature profiles (site and source) and temperature gradient (vT source -vT site ) with the non-sea-salt calcium and sodium records suggests a secondary influence of atmospheric transport changes on aerosol variations. ß

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Section: Data Ice Core Chronology and Comparison With Other Isotopicmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

A late-glacial high-resolution site and source temperature record derived from the EPICA Dome C isotope records (East Antarctica)

Stenni¹,

Jouzel²,

Masson‐Delmotte³

et al. 2004

Earth and Planetary Science Letters

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“…Instead the cooling after 14 ka is roughly in phase between Greenland and Antarctica. This gives a deglaciation pattern (asynchrony) quite parallel to that observed during the A1 and A2 glacial events in Antarctica and the corresponding Dansgaard-Oeschger events in Greenland [Blunier et al, 1998]. In turn, the now classical picture of a seesaw [Broecker 1998;Stocker, 1998] …”

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confidence: 99%

“…Those cores can now be cross dated owing to the global synchronism of air composition changes [Sowers and Bender, 1995;Blunier et al, 1998]. Still, as far as Antarctica is concerned, conclusions are mainly based on two records only, Byrd in West Antarctica and Vostok in Central East Antarctica (Figure 1).…”

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confidence: 99%

A new 27 ky high resolution East Antarctic climate record

Jouzel¹,

Masson²,

Cattani³

et al. 2001

Geophysical Research Letters

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154

106

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Abstract. The ice core recently drilled at the Dome Concordia site on the East Antarctic plateau provides a new high resolution isotope record covering part of the last glacial, the last transition and the Holocene. The two step shape of the deglaciation is remarkably similar for all the ice cores now available on the East Antarctic plateau. The first warming trend ends about 14000 years ago and is followed by the well marked Antarctic Cold Reversal (ACR) with a secondary peak common to all records. During the deglaciation, there are more similarities between the near coastal site of Taylor Dome and inland East Antarctica than between Taylor Dome and central Greenland. However, the results for EPICA do appear to confirm the Taylor Dome timescale after about 14 ka, showing cooling into the ACR roughly in phase between Greenland and Antarctica. While the overall deglacial pattem is asynchronous, this suggests that the now classical picture of a temperature seesaw between Antarctica and Greenland may be too simplistic.

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“…These variations were used to synchronize the Byrd and the Vostok ice cores to the GRIP time scale [Blunier et al, 1998]. The relative uncertainty of the CH4 records reduces to 200 years, much lower than the relative uncertainty applying the original individual time scales and good enough for our purpose.…”

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confidence: 99%

Changes in the atmospheric CH₄ gradient between Greenland and Antarctica during the Last Glacial and the transition to the Holocene

Dällenbach

Blunier

Flückiger

et al. 2000

Geophysical Research Letters

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194

138

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Asynchrony of Antarctic and Greenland climate change during the last glacial period

Cited by 743 publications

References 50 publications

A late-glacial high-resolution site and source temperature record derived from the EPICA Dome C isotope records (East Antarctica)

A late-glacial high-resolution site and source temperature record derived from the EPICA Dome C isotope records (East Antarctica)

A new 27 ky high resolution East Antarctic climate record

Changes in the atmospheric CH₄ gradient between Greenland and Antarctica during the Last Glacial and the transition to the Holocene

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Asynchrony of Antarctic and Greenland climate change during the last glacial period

Cited by 743 publications

References 50 publications

A late-glacial high-resolution site and source temperature record derived from the EPICA Dome C isotope records (East Antarctica)

A late-glacial high-resolution site and source temperature record derived from the EPICA Dome C isotope records (East Antarctica)

A new 27 ky high resolution East Antarctic climate record

Changes in the atmospheric CH4 gradient between Greenland and Antarctica during the Last Glacial and the transition to the Holocene

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Product

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Changes in the atmospheric CH₄ gradient between Greenland and Antarctica during the Last Glacial and the transition to the Holocene