Trace elements in Vostok Antarctic ice during the last four climatic cycles

Gabrielli, Paolo; Planchon, F.; Hong, Sungmin; Lee, Khang Hyun; Hur, Soon Do; Barbante, Carlo; Ferrari, Christophe; Petit, J. R.; Lipenkov, V. Ya.; Cescon, Paolo; Boutron, Claude F.

doi:10.1016/j.epsl.2005.03.001

Cited by 54 publications

(64 citation statements)

References 29 publications

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“…The concentrations of Li T in the EDC ice core are very similar to previously determined Li T concentrations of about 1-100 pg g − 1 in the East Antarctic Vostok ice core [19].…”

Section: The LI + and Li T Recordssupporting

confidence: 69%

“…Despite the fact that the composition of rock and soil dust reaching Antarctica might significantly differ from the composition of the mean upper crust, EFc values close to unity (up to ∼ 5) will indicate that the corresponding elements mainly originate from rock and soil dust. Using Ba as a crustal indicator we may expect larger EFc values (up to ∼10) for soil dust since a fraction of Ba is strongly bounded to silicates and might be not detected by ICP-SFMS [19]. It should however be emphasized that the choice of other crustal compositions would not make any significant differences in the interpretation.…”

Section: Dust Compositionmentioning

confidence: 99%

“…Insoluble trace elements in Antarctic ice are mainly related to insoluble mineral dust impurities [19], while soluble species are mainly of marine origin. However, certain fractions of soluble species are dissolved or leached from dust minerals.…”

Section: The LI + and Li T Recordsmentioning

confidence: 99%

“…Concentrations of total Li (Li T ) were previously measured in the East Antarctic Vostok ice core [19]. Low concentrations in the order of a few pg g − 1 were found during interglacial periods and high concentrations (between 40 and 100 pg g − 1 ) during glacial periods.…”

Section: Introductionmentioning

confidence: 99%

“…A complementary record of the total amount of Li (soluble plus insoluble, Li T ) was obtained using Inductively Coupled Plasma-Sector Field Mass Spectrometry (ICP-SFMS) [19]. A comparison of the two Li records offers an ideal opportunity to investigate soluble and insoluble behavior of Li in Antarctic ice.…”

Section: Introductionmentioning

confidence: 99%

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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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“…The concentrations of Li T in the EDC ice core are very similar to previously determined Li T concentrations of about 1-100 pg g − 1 in the East Antarctic Vostok ice core [19].…”

Section: The LI + and Li T Recordssupporting

confidence: 69%

Section: Dust Compositionmentioning

confidence: 99%

Section: The LI + and Li T Recordsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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Climate‐related variations in atmospheric Sb and Tl in the EPICA Dome C ice (East Antarctica) during the past 800,000 years

Hur

Soyol-Erdene

Hwang

et al. 2013

Global Biogeochemical Cycles

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[1] A record of antimony (Sb) and thallium (Tl) from the European Project for Ice Coring in Antarctica (EPICA) Dome C Antarctic ice core provides the characteristics of climate-related natural changes in concentrations and fluxes of these toxic elements over the time period back to Marine Isotope Stage 20.2,~800 kyr B.P. A strong variability in concentrations and fluxes are observed for both elements, with considerably higher values during glacial maxima and lower values during intermediate and warm periods. Rock and soil dust accounts for, on average, 58% of Sb and 76% of Tl in ice during glacial maxima. This contribution remains significant during warm periods, accounting for 21% for Sb and 27% for Tl. The contribution from volcanoes appears to be very important particularly for Tl when climatic conditions become warmer, with an estimated volcanic contribution of 72% for Tl during interglacials. The sea-salt contribution is significant for Sb, particularly during intermediate climatic periods, with an average contribution of 17%. This sea-salt contribution is most likely caused by greater production of sea salt from highly saline frost flowers and relatively more efficient transport of Sb-enriched sea-ice salt from source areas on the East Antarctic Plateau. Our ice core data, along with snow data recently reported from the Antarctic snow layers at Dome Fuji, shows that the present-day Sb flux (6.6 ng/m 2 /yr) is approximately double the highest natural level (2.8 ng/m 2 /yr) during glacial maxima throughout the last successive eight glacial/interglacial cycles. This result indicates that human activity has induced the greatest perturbation of the atmospheric cycle of Sb ever experienced over a period of~800 kyr in the most remote area on Earth.

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Iron speciation in aerosol dust influences iron bioavailability over glacial‐interglacial timescales

Spolaor

Vallelonga

Cozzi

et al. 2013

Geophysical Research Letters

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Iron deposition influences primary production and oceanic sequestration of atmospheric carbon dioxide (CO2). Iron has two oxidation states, Fe(II) and Fe(III), with Fe(II) being more soluble and available for oceanic phytoplankton uptake. The past proportions of soluble iron in aerosol dust remain unknown. Here we present iron speciation (Fe2+ and Fe3+) in the Antarctic Talos Dome ice core over millennial time scales. We demonstrate that iron speciation over the last 55 kyr is linked to increasing quantities of fine dust (FD) (0.7–5 µm) and intensified long‐range dust transport. We propose that Fe(II) and Fe2+ production is principally enhanced in FD by photoreduction, although pH and organic complexation may also contribute to the speciation dynamics. During the Last Glacial Maximum, Fe2+ concentrations in dust increased by up to seven times more than interglacial levels, while Fe3+ only doubled. Cold and dusty climatic periods may increase the percentage of biologically available Fe(II) and Fe2+ deposited in the nutrient‐limited Southern Ocean, allowing greater phytoplankton uptake and perhaps increased CO2 drawdown.

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Trace elements in Vostok Antarctic ice during the last four climatic cycles

Cited by 54 publications

References 29 publications

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

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

Climate‐related variations in atmospheric Sb and Tl in the EPICA Dome C ice (East Antarctica) during the past 800,000 years

Iron speciation in aerosol dust influences iron bioavailability over glacial‐interglacial timescales

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