Consistent dating for Antarctic and Greenland ice cores

Lemieux‐Dudon, Bénédicte; Blayo, Éric; Petit, Jean‐Robert; Waelbroeck, C.; Svensson, Anders; Ritz, Catherine; Barnola, Jean-Marc; Narcisi, Biancamaria; Parrenin, Frédéric

doi:10.1016/j.quascirev.2009.11.010

Cited by 287 publications

(230 citation statements)

References 42 publications

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“…This event is chronologically very well constrained by two tephra, at 14.47±0.2 and 13.76±0.1 cal. ka BP, in our record and is synchronous with the d 13 C rise of CO 2 according to the recent chronology of the EDC ice-core record 36 within the 1s uncertainties. Here, for the first time, we are able to demonstrate a good synchronicity between climatic marine and cryospheric records in the Southern Hemisphere for a rapid event, displaying high temporal resolution (o150 years) and accurately dated boundaries.…”

Section: Discussionsupporting

confidence: 84%

“…These environmental changes have been attributed to climate fluctuations that occurred since the last glacial period in northern Patagonia and have been mainly related to precipitation and glacier behaviour 38 . The two steps in atmospheric CO 2 increase during the deglaciation 35 , from 17.4 to 14.4 ka and 12.5 to 11.5 ka, respectively 36 , are synchronous with the two latest periods of SO upwelling, indicated both by the B-P age and Dd 13 C decrease in core MD07-3088 (Fig. 3h, shaded areas W1 and W2).…”

Section: Discussionmentioning

confidence: 86%

“…Figure 3 illustrates the MD07-3088 records on a calendar age (cal.) scale, compared with the atmospheric d 13 C 35 and isotopic compositions from the EDC ice core 32,36 and the record of atmospheric 14 C activity 26,27 . The planktic foraminifera d 13 C record from core MD07-3088 shows a similar pattern to the d 13 C of CO 2 inferred from the EDC ice core (Fig.…”

Section: Discussionmentioning

confidence: 99%

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Carbon isotope records reveal precise timing of enhanced Southern Ocean upwelling during the last deglaciation

et al. 2013

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International audienceThe Southern Ocean plays a prominent role in the Earth’s climate and carbon cycle. Changes in the Southern Ocean circulation may have regulated the release of CO₂ to the atmosphere from a deep-ocean reservoir during the last deglaciation. However, the path and exact timing of this deglacial CO₂ release are still under debate. Here we present measurements of deglacial surface reservoir ¹⁴C age changes in the eastern Pacific sector of the Southern Ocean, obtained by ¹⁴C dating of tephra deposited over the marine and terrestrial regions. These results, along with records of foraminifera benthic–planktic ¹⁴C age and δ¹³C difference, provide evidence for three periods of enhanced upwelling in the Southern Ocean during the last deglaciation, supporting the hypothesis that Southern Ocean upwelling contributed to the deglacial rise in atmospheric CO₂. These independently dated marine records suggest synchronous changes in the Southern Ocean circulation and Antarctic climate during the last deglaciation

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Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 99%

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Carbon isotope records reveal precise timing of enhanced Southern Ocean upwelling during the last deglaciation

et al. 2013

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“…In addition, some recent analyses (Delmonte et al, 2012) by SEM-EDS on TALDICE Holocene dust samples show ubiquitous presence of volcanic material mixed with dust, even in the very low-concentrated background samples. Narcisi et al (2010) pointed out the presence of 16 visible tephra layers of "local" origin (Antarctica) during the Holocene in the TALDICE record. While in terms of the insoluble particles flux this is a minor contribution that does not alter significantly the absolute values and the interpretations of our records (which do not include visible tephra layers), this obviously limits the possibility to use the Sr and Nd isotopic fingerprint of "bulk" dust extracted from the samples.…”

Section: The Taldice Dust Profile: Main Featuresmentioning

confidence: 99%

Interpreting last glacial to Holocene dust changes at Talos Dome (East Antarctica): implications for atmospheric variations from regional to hemispheric scales

et al. 2012

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“…White et al, 1997;Andersen et al, 2006a). Therefore, in order to represent climate evolution in the broader Antarctic region, we construct a δ 18 O ice composite from the LD record and records from other highaccumulation/near-coastal sites: Byrd (Blunier and Brook, 2001), Siple Dome (Brook et al, 2005), Talos Dome Buiron et al, 2011), and EPICA Dronning Maud Land (EDML) (EPICA c.m., 2006;Lemieux-Dudon et al, 2010). These five cores are selected since they sample from a wide geographic range, including the Indian (LD), Atlantic (EDML), and Pacific (Siple Dome, Byrd, Talos Dome) sectors of the Antarctic continent (Fig.…”

Section: Introductionmentioning

confidence: 99%

The last deglaciation: timing the bipolar seesaw

et al. 2011

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Abstract. Precise information on the relative timing of north-south climate variations is a key to resolving questions concerning the mechanisms that force and couple climate changes between the hemispheres. We present a new composite record made from five well-resolved Antarctic ice core records that robustly represents the timing of regional Antarctic climate change during the last deglaciation. Using fast variations in global methane gas concentrations as time markers, the Antarctic composite is directly compared to Greenland ice core records, allowing a detailed mapping of the inter-hemispheric sequence of climate changes. Consistent with prior studies the synchronized records show that warming (and cooling) trends in Antarctica closely match cold (and warm) periods in Greenland on millennial timescales. For the first time, we also identify a sub-millennial component to the inter-hemispheric coupling. Within the Antarctic Cold Reversal the strongest Antarctic cooling occurs during the pronounced northern warmth of the Bølling. Warming then resumes in Antarctica, potentially as early as the Intra-Allerød Cold Period, but with dating uncertainty that could place it as late as the onset of the Younger Dryas stadial. There is little-to-no time lag between climate transitions in Greenland and opposing changes in Antarctica. Our results lend support to fast acting inter-hemispheric coupling mechanisms, including recently proposed bipolar atmospheric teleconnections and/or rapid bipolar ocean teleconnections.

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Consistent dating for Antarctic and Greenland ice cores

Cited by 287 publications

References 42 publications

Carbon isotope records reveal precise timing of enhanced Southern Ocean upwelling during the last deglaciation

Carbon isotope records reveal precise timing of enhanced Southern Ocean upwelling during the last deglaciation

Interpreting last glacial to Holocene dust changes at Talos Dome (East Antarctica): implications for atmospheric variations from regional to hemispheric scales

The last deglaciation: timing the bipolar seesaw

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