Holocene climate variations in the western Antarctic Peninsula: evidence for sea ice extent predominantly controlled by insolation and ENSO variability changes

Etourneau, Johan; Collins, Lewis; Willmott, Verónica; Kim, J. H.; Barbara, Loïc; Leventer, Amy; Schouten, Stefan; Damsté, Jaap S. Sinninghe; Bianchini, Adalto; Klein, Vincent; Crosta, Xavier; Massé, Guillaume

doi:10.5194/cpd-9-1-2013

Cited by 28 publications

(80 citation statements)

References 120 publications

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“…Benthic foraminiferal (Ishman and Sperling, 2002) and d 18 O benthic (Shevenell and Kennett, 2002) records from ODP 1098, Palmer Deep, suggest that cyclic incursions of UCDW also penetrated the northern WAP shelf from 3.7 ka BP. The establishment of this episodic overturning of the water column from 4.2 ka BP at TPC522 coincides with the interval between 5 and 3.6 ka BP which appears to mark a period of transition from non-cyclic to cyclic forcing, most likely ENSO, on the WAP surface ocean records at Palmer Deep (Etourneau et al, 2013;Pike et al, 2013).…”

Section: Late Holocenementioning

confidence: 90%

“…The presence of ice during the summer months, likely from glacial discharge rather than sea ice, is inferred from increased abundances of T. antarctica (cold; Buffen et al, 2007) and consistent with the drop in relative SST from 5.9 ka BP and reduced flux of planktonic foraminifera to the sea floor. At Palmer Deep, longer sea ice seasons from~7 ka BP (Etourneau et al, 2013) and reduced glacial discharge (Pike et al, 2013) also suggest cooling occurred during the mid Holocene at the same time as the ice shelf re-formed in George VI Sound ( Fig. 1; Smith et al, 2007;Roberts et al, 2008).…”

Section: Mid Holocenementioning

confidence: 92%

“…This interpretation of m-UDCW influence on the inner shelf helps explain the rapid retreat of the Marguerite Bay ice stream from at least 9.7 ka BP, and subsequent collapse of the George VI Ice Shelf (Bentley et al, 2011), the rapid thinning of terrestrial ice in inner Marguerite Bay and the onset of marine sedimentation in adjacent fjords (Bentley et al, 2011;Hodgson et al, 2013). Similarly, enhanced upwelling of UCDW onto the shelf prior to~7 ka BP is likely to account for elevated SST (Shevenell et al, 2011;Etourneau et al, 2013) and frontal melting of glaciers (Pike et al, 2013;Fig. 7E) further north at Palmer Deep and the generally warm, limited sea ice conditions experienced throughout the WAP at this time (Bentley et al, 2009;Allen et al, 2010).…”

Section: Early Holocenementioning

confidence: 92%

“…A transition from non-cyclic to cyclic-forcing at Palmer Deep is recognised between 5 and 3.6 ka BP (Shevenell and Kennett, 2002;Etourneau et al, 2013;Pike et al, 2013). The onset of this cyclicforcing along the WAP appears to be associated with the waning influence of the SWW and the increased frequency and/or magnitude of ENSO events from 4.2 ka BP ( Fig.…”

Section: Controls On Ucdw-upwelling Within Marguerite Baymentioning

confidence: 96%

“…Neny Fjord, (Allen et al, 2010), 12. Palmer Deep (Ishman and Sperling, 2002;Shevenell and Kennett, 2002;Taylor and Sjunneskog, 2002;Shevenell et al, 2011;Etourneau et al, 2013); 13. James Ross Island Ice Core (Mulvaney et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Oceanographic variability on the West Antarctic Peninsula during the Holocene and the influence of upper circumpolar deep water

Peck

Allen

Kender

et al. 2015

Quaternary Science Reviews

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. along the WAP to past changes in SWW by analysing the exceptionally well preserved 22 planktonic and benthic foraminifera, diatoms and pigments in marine sediment core TPC522, 23Marguerite Bay (Fig. 1). These biogenic components provide proxies for reconstructing past METHODS 2The chronology of TPC522 is based on twelve acid insoluble organic matter (AIOM), 3and one monospecific benthic foraminifera (Globocassidulina biora) radiocarbon dates. 4Dates were calibrated using CALIB 6.0 using the MARINE09 calibration curve (Stuiver & 5 Reimer, 1993). R was set at 1353 years based on a local mean surface sample radiocarbon Table 1). Classical radiocarbon age-depth modelling was undertaken 10 using CLAM v, 2.1 software in R (Blaauw, 2010) using a smooth spline curve fit, running 11 1000 iterations at 1 cm intervals (Fig. 3A). To independently date the surface sediments, 4For diatom counts the quantitative slide preparation method of Scherer (1994) was 5 used and counting was carried out at ×1000 magnification on an Olympus BX42 microscope. for >2 % of the CRS-free assemblage within at least one sample were included. 16Correspondence analysis (CA) was performed on both the diatom and benthic foraminferal 17 assemblage counts using the software of Hammer et al. (2005). 18For pigment analysis, bulk sediment samples were freeze-dried and homogenised. 19Approximately 2 g of sample was extracted with an organic solvent mixture of 24Samples were redissolved in a known volume of acetone and transferred to a 2 ml quartz 25 7 cuvette for analysis in a WPA spectrophotometer. Absorbance was recorded by 1 measurements in triplicate at the wavelengths 410 nm and 665 nm, which correspond to the 2 diagenetic transformation products of chlorophyll, the chlorins (Harris et al., 1996).The excess 210 Pb activity profile confirmed that the upper sediments were deposited 7 within recent decades (Fig. 3B). The surface sediment radiocarbon ages are therefore STATISTICAL ANALYSIS OF ASSEMBLAGES 23The first three axes of the CA accounted for 57% and 66% of the variance in the 24 diatom and foraminifera assemblages respectively (Fig. 4) (Fig. 5F), 18Thalassiosira gracilis and Proboscia truncata, is indicates reflect relatively warm surface (Fig. 5N). , 2010; Grossman, 1987). 9The stable and consistently offset benthic and planktonic 18 O values throughout the 10 early Holocene interval are consistent with a persistent density structure between the 11 pycnocline and sea floor, at least during the ...

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Section: Late Holocenementioning

confidence: 90%

Section: Mid Holocenementioning

confidence: 92%

Section: Early Holocenementioning

confidence: 92%

Section: Controls On Ucdw-upwelling Within Marguerite Baymentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Oceanographic variability on the West Antarctic Peninsula during the Holocene and the influence of upper circumpolar deep water

Peck

Allen

Kender

et al. 2015

Quaternary Science Reviews

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First records of winter sea ice concentration in the southwest Pacific sector of the Southern Ocean

et al. 2015

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We use a Generalized Additive Model (GAM) to provide the first winter sea ice concentration record from two cores located within the southwest Pacific sector of the Southern Ocean. To compliment the application of GAM, a time series analysis on satellite records of sea ice concentration data was used to extend the standard 13.25 year time series used for paleoceanography. After comparing GAM sea ice estimates with previously published paleo sea ice data we then focus on a new paleo winter sea ice record for marine sediment core E27-23 (59°37.1'S, 155°14.3'E), allowing us to provide a more comprehensive view of winter sea ice dynamics for the southwest Pacific Ocean. The paleo winter sea ice concentration estimates provide the first suggestion that winter sea ice within the southwestern Pacific might have expanded during the Antarctic Cold Reversal. Throughout the Holocene, core E27-23 documents millennial scale variability in paleo winter sea ice coverage within the southwest Pacific. Holocene winter sea ice expansion may have resulted from the Laurentide Ice Sheet deglaciation, increased intensity of the westerly winds, as well as a northern migration of the Subtropical and/or Sub-Antarctic Fronts. Brief consideration is given to the development of a paleo summer sea ice proxy. We conclude that there is no evidence that summer sea ice ever existed at core sites SO136-111 and E27-23 over the last 220 and 52,000 years, respectively.

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Environmental responses of the Northeast Antarctic Peninsula to the Holocene climate variability

et al. 2016

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International audienceIn this study, we present a unique high-resolution Holocene record of oceanographic and climatic change based on analyses of diatom assemblages combined with biomarker data from a sediment core collected from the Vega Drift, eastern Antarctic Peninsula (EAP). These data add to the climate framework already established by high-resolution marine sedimentary records from the Palmer Deep, western Antarctic Peninsula (WAP). Heavy sea ice conditions and reduced primary productivity were observed prior to 7.4 ka B.P. in relation with the proximity of the glacial ice melt and calving. Subsequent Holocene oceanographic conditions were controlled by the interactions between the Westerlies-Antarctic Circumpolar Current (ACC)-Weddell Gyre dynamics. A warm period characterized by short seasonal sea ice duration associated with a southern shift of both ACC and Westerlies field persisted until 5 ka B.P. This warm episode was then followed by climate deterioration during the middle-to-late Holocene (5 to 1.9 ka B.P.) with a gradual increase in annual sea ice duration triggered by the expansion of the Weddell Gyre and a strong oceanic connection from the EAP to the WAP. Increase of benthic diatom species during this period was indicative of more summer/autumn storms, which was consistent with changes in synoptic atmospheric circulation and the establishment of low- to high-latitude teleconnections. Finally, the multicentennial scale variability of the Weddell Gyre intensity and storm frequency during the late Holocene appeared to be associated with the increased El Niño–Southern Oscillation frequency

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Holocene climate variations in the western Antarctic Peninsula: evidence for sea ice extent predominantly controlled by insolation and ENSO variability changes

Cited by 28 publications

References 120 publications

Oceanographic variability on the West Antarctic Peninsula during the Holocene and the influence of upper circumpolar deep water

Oceanographic variability on the West Antarctic Peninsula during the Holocene and the influence of upper circumpolar deep water

First records of winter sea ice concentration in the southwest Pacific sector of the Southern Ocean

Environmental responses of the Northeast Antarctic Peninsula to the Holocene climate variability

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