The two-step shape and timing of the last deglaciation in Antarctica

Jouzel, Jean; Petit, J. R.; Martin, Maria A.; Duclos, Y; Stiévenard, M.; Lorius, C.; Toots, Maarja; M�li�res, MA; Burckle, L. H.; Ni, Barkov; Kotlyakov, V.M.; Vaikmäe, Rein

doi:10.1007/s003820050067

Cited by 55 publications

(60 citation statements)

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“…The evidence for the antiphasing of the millennial-duration climate changes occurring on the Antarctic continent compared with those elsewhere on the planet comes from the correlation of the oxygen isotope records for the Antarctic Byrd and the Greenland GISP2 ice cores (15)(16)(17). This antiphasing is clearly seen in the deglaciation interval (Ϸ20,000 to Ϸ10,000 calendar years ago).…”

Section: Appendixmentioning

confidence: 94%

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Was a change in thermohaline circulation responsible for the Little Ice Age?

Broecker

2000

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

156

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Section: Appendixmentioning

confidence: 94%

“…DEL 14 C is the deviation of the recontructed initial 14 C͞C from the long-term mean. (Lower) 18 O records for the Greenland Ice Science Project (GISP2) and the Byrd Station Antarctica ice cores (15)(16)(17). The time scale is in thousands of years before present (ka).…”

Section: Appendixmentioning

confidence: 99%

Was a change in thermohaline circulation responsible for the Little Ice Age?

Broecker

2000

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

156

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“…Bowler, 1976;Harrison, 1993;Barrows et al, 2002). Evidence suggests the period was characterised by increased aridity and wind strength, enhanced evapotranspiration and precipitation up to 50% lower than present in the south of the continent (Bowler, 1976;Bowler et al, 1976;Bradley, 1985;Jouzel et al, 1995;Dodson and Ono, 1997). The resulting increase in aridity across much of Australia resulted in intensified dune building, lunette formation and increased dust entrainment and transport as vegetation cover diminished (Bowler, 1976;Wopfner and Twidale, 1988;McTainsh, 1989;Nanson et al, 1992;Hesse and McTainsh, 1999;Haberle, 2005).…”

Section: Introductionmentioning

confidence: 99%

Climate variability during the Last Glacial Maximum in eastern Australia: evidence of two stadials?

Petherick

McGowan

Moss

2008

J Quaternary Science

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A high-resolution, multiproxy record encompassing the last glacial-interglacial transition is presented for Native Companion Lagoon, a coastal site in subtropical eastern Australia. Rates of aeolian sedimentation in the lake were established by trace element analyses of lacustrine sediments and used as a proxy for aridity. In conjunction with sediment moisture content, charcoal and pollen these provide a multi-decadal record of palaeoenvironmental variability for the period 33-18 k cal. yr BP. Results indicate that the Last Glacial Maximum in eastern Australia spanned almost 10 k cal. yr, and was characterised by two distinct cold dry events at approximately 30.8 k cal. yr BP and 21.7 k cal. yr BP. Provenance of selected sediment samples by trace element geochemical fingerprinting shows that continental sourced aeolian sediments originated primarily from South Australia during these cold events and from sites in central Australia during the intervening time. Used in combination with a pollen record, the provenance of long-travelled dust to mainland sites shows that the two cold events were characterised by frequent meridional dry southwesterly winds rather than zonal westerly airflow as previously believed. The intervening period was cool and humid, which we infer as being associated with more frequent southeasterly winds of maritime origin. These results lend support to previous research that indicates the Southern Hemisphere experienced a period of widespread climatic amelioration at the height of the last glacial known as the Antarctic Isotopic Maximum.

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“…However, accumulation rates are generally too low at the Antarctic inland areas to preserve annual glaciochemical signals. For instance, the accumulation rates are 0.065 m water equivalent per year at South Pole [1] , 0.03 m water equivalent per year at Dome C [2] , 0.023 m water equivalent per year at Vostok [3] , 0.038 m water equivalent per year at Dome B [4] , and 0.032 m water equivalent per year at Dome F [5] . It is conceivable that a certain annual layer might be devastated in a place with extremely low accumulation rate [6] .…”

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confidence: 99%

Recent accumulation rate at Dome A, Antarctica

Hou

Xiao

et al. 2007

CHINESE SCI BULL

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Based on the horizon of β activity and the density profiles, recent accumulation rate at Dome A, Antarctica is calculated to be 0.023 m water equivalent per year. This value is comparative to the accumulation rates deduced from the other inland sites of Antarctica. Clear-sky precipitation (or diamond dust) dominates the total precipitation at Dome A region. We speculate Dome A as a potential site to discover the oldest ice in Antarctica due to its tremendous ice thickness (>3000 m), extremely low accumulation rate, and low ice velocity.

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The two-step shape and timing of the last deglaciation in Antarctica

Cited by 55 publications

References 0 publications

Was a change in thermohaline circulation responsible for the Little Ice Age?

Was a change in thermohaline circulation responsible for the Little Ice Age?

Climate variability during the Last Glacial Maximum in eastern Australia: evidence of two stadials?

Recent accumulation rate at Dome A, Antarctica

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