Patagonian origin of glacial dust deposited in East Antarctica (Vostok and Dome C) during glacial stages 2, 4 and 6

Basile, Isabelle; Grousset, F.; Revel, Marie; Petit, J. R.; Biscaye, Pierre E.; Barkov, N. I.

doi:10.1016/s0012-821x(96)00255-5

Cited by 351 publications

(325 citation statements)

References 34 publications

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“…Over the glacial periods of the last 160,000 years, the majority of dust particles that were trapped in ice in Antarctica have been derived primarily from Patagonia 43,44 . Consistent with the aeolian input of mesophilic organisms into Antarctica, we found many non-thermal cosmopolitan OTUs at Tramway Ridge that were predominately found in the surface strata (0-2 cm) of both profiles.…”

Section: Discussionmentioning

confidence: 99%

Evidence of global-scale aeolian dispersal and endemism in isolated geothermal microbial communities of Antarctica

et al. 2014

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Section: Discussionmentioning

confidence: 99%

Evidence of global-scale aeolian dispersal and endemism in isolated geothermal microbial communities of Antarctica

et al. 2014

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“…[13] Ice cores from the Antarctic Peninsula suggest that the flux of dust originating from Patagonia was much larger during the LGM than at present [Basile et al, 1997;Petit et al, 1999;Delmonte et al, 2002]. The main mechanisms which can explain the enhanced dust flux are (1) increased westerly winds and (2) drier conditions in the source region, which would be compatible with the hypothesis of weaker westerly storm tracks.…”

Section: Paleoproxies and Modeling Studies Of The Southern Hemispherementioning

confidence: 96%

Climate and marine carbon cycle response to changes in the strength of the Southern Hemispheric westerlies

et al. 2008

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[1] It has been previously suggested that changes in the strength and position of the Southern Hemisphere westerlies could be a key contributor to glacial-interglacial atmospheric CO 2 variations. To test this hypothesis, we perform a series of sensitivity experiments using an Earth system model of intermediate complexity. A strengthening of the climatological mean surface winds over the Southern Ocean induces stronger upwelling and increases the formation of Antarctic Bottom Water. Enhanced Ekman pumping brings more dissolved inorganic carbon (DIC)-rich waters to the surface. However, the stronger upwelling also supplies more nutrients to the surface, thereby enhancing marine export production in the Southern Hemisphere and decreasing the DIC content in the euphotic zone. The net response is a small atmospheric CO 2 increase ($5 ppmv) compared to the full glacial-interglacial CO 2 amplitude of $90 ppmv. Roughly the opposite results are obtained for a weakening of the Southern Hemisphere westerly winds.

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“…Reactions between dust aerosols and aerosols of sulfuric or nitric acid during atmospheric transport is also a possibility (e.g. [8]). So we may expect different acidity effects on dust during different climate periods.…”

Section: Dust Compositionmentioning

confidence: 99%

“…Many new high resolution records of dust species have been obtained from the recently recovered EPICA Dome C (EDC) ice core [7], providing an ideal database to investigate, in detail, temporal changes in East Antarctic dust. Isotope analyses (Nd and Sr) of glacial dust from East Antarctic ice cores have identified Patagonia (Argentina) as the main glacial dust source area, with possible additional contributions from South Africa or Australia [6,8]. Recent analyses on East Antarctic ice cores are confirming a Patagonian origin for dust during glacial times [9], while for interglacial periods other source locations, such as Eastern Australia in particular, may have contributed to a more important extent [10].…”

Section: Introductionmentioning

confidence: 99%

Soluble and insoluble lithium dust in the EPICA DomeC ice core—Implications for changes of the East Antarctic dust provenance during the recent glacial–interglacial transition

Siggaard-Andersen¹,

Gabrielli²,

Steffensen³

et al. 2007

Earth and Planetary Science Letters

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Continental dust impurities in Antarctic ice provide information on climate changes in the dust source areas and on past atmospheric circulation. We investigated records of dust species from the last 45 ka in the East Antarctic EPICA DomeC (EDC) ice core with special emphasis on the lithium (Li) content of dust. We obtained two complementary Li-records using a new Ion Chromatography (IC) technique in line with Inductively Coupled Plasma-Sector Field Mass Spectroscopy (ICP-SFMS). Concentrations of soluble Li (Li + ) were obtained using IC, while total concentrations of Li (Li T ) were obtained using ICP-SFMS, providing an ideal opportunity to investigate the soluble and insoluble chemistry of Li in East Antarctic dust over the last glacialinterglacial transition. The records show that changes in the solubility of Li are associated with climatic changes. For the late glacial period and the Antarctic Cold Reversal (ACR) a large fraction, up to 75%, of the Li T content is present as insoluble minerals whereas for the Holocene period it seems that Li is present mainly as soluble salts (Li + ). We compared the concentrations of Li + with the concentrations of Ca 2+ and the mass and size characteristics of the dust, which were obtained using Coulter Counting (CC). Furthermore we compared the concentrations of Li T with the concentrations of Ba T . Our analysis suggests that the changes in solubility of Li along the EDC ice core are related to changes in compositions of the dust minerals. During the late glacial period, changes in the dust composition is characteristic of variations in the strength of the atmospheric circulation, while changes over the last glacial-interglacial transition are indicative of a change in the major dust source areas. The dust characteristics for the glacial and the Holocene periods indicate two different dust types. The glacial dust type partly disappeared after the ACR, while the Holocene dust type appeared significantly after around 16 ka BP and became dominant after the ACR. The relative increase in the Holocene dust type at the glacial-interglacial transition could be due to changed conditions in the potential source area or to changed patterns of atmospheric circulation, resulting in enhanced transport from a source area that was different from the glacial source areas.

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Patagonian origin of glacial dust deposited in East Antarctica (Vostok and Dome C) during glacial stages 2, 4 and 6

Cited by 351 publications

References 34 publications

Evidence of global-scale aeolian dispersal and endemism in isolated geothermal microbial communities of Antarctica

Evidence of global-scale aeolian dispersal and endemism in isolated geothermal microbial communities of Antarctica

Climate and marine carbon cycle response to changes in the strength of the Southern Hemispheric westerlies

Soluble and insoluble lithium dust in the EPICA DomeC ice core—Implications for changes of the East Antarctic dust provenance during the recent glacial–interglacial transition

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