New constraints on elemental and Pb and Nd isotope compositions of South American and Southern African aerosol sources to the South Atlantic Ocean

Khondoker, Roulin; Weiß, Dominik J.; Flierdt, Tina van de; Rehkämper, Mark; Kreissig, Katharina; Coles, Barry J.; Strekopytov, Stanislav; Humphreys‐Williams, Emma; Dong, Shikui; Bory, A.; Bout-Roumazeilles, V.; Smichowski, Patricia; Cid-Agüero, Pedro; Babinski, Marly; Losno, R.; Monna, Fabrice

doi:10.1016/j.chemer.2018.05.001

Cited by 15 publications

(7 citation statements)

References 65 publications

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“…In the Atlantic Sector of the Southern Ocean, the Andean Orogen mostly corresponds to Patagonia (Pat). The geology and the isotopic composition of this region is similar with the Antarctic Peninsula: radiogenic Nd, unradiogenic Sr and Pb isotope ratios, but with higher 207 Pb/ 204 Pb than the Antarctic Peninsula (figure 1; Olivero and Martinioni, 2001;Sayago et al, 2001 and references therein;Smith et al, 2003;Khondoker et al, 2018). Even if the climate is slightly more humid than in the Antarctic Peninsula, Patagonia also produces mainly well-crystallized smectite (Petschick et al, 1996;Desiage et al, 2018;Khondoker et al, 2018).…”

Section: B Geological Settingmentioning

confidence: 74%

“…In South America: Guyana Highlands -GH-, Brazilian Highlands -BH-, Argentinian Pampas -Pam-, Patagonia -Pat-; in Africa: Namibian deserts-Na-; in Antarctica: Ellsworth Mountains -EM-, Antarctic Peninsula -AntP-, Pensacola Mountains -PM-, Berkner Islands -BI-, Shackleton Range -SR-, Coats Land -CL-, Dronning Maud Land -DML-. Clay mineral inputs to the South Atlantic Ocean derived from the studies of Petschick et al (1996 ); Diekmann et al (2000); Walter et al (2000); Guyot et al (2007); Bayon et al (2016); and Khondoker et al (2018).…”

Section: General Settingmentioning

confidence: 99%

“…The coupled ε Nd -87 Sr/ 86 Sr isotope variation of the clay-size fraction (figure 6) reveal a mixed provenance between young sources around the Scotia Sea (Scotia Arc, Antarctic Peninsula, Patagonia) and southern South America (Patagonia and Pampas), and an old source from East Antarctica or the South American Shield (i.e., Brazil and Parana River). Fretzdorff et al (2002), -Scotia Ridge-; Khondoker et al (2018), -Patagonia-; Cohen and O'Nions (1982); Barreiro (1983), -Scotia Arc-; Lee et al (2005), Kosler et al (2009), Flowerdew et al (2012) -Antarctic Peninsula-, de Mahiques et al (2007, -South American Shield-; Flowerdew et al, (2012)…”

mentioning

confidence: 99%

“…(1996); Basile et al (1997); Walter et al (2000); de Mahiques (2008); Jeandel et al (2007), and references therein; Mallmann et al (2007); Ganade de Araujo et al. (2014); Fuck et al (2014); -Patagonia, Pampas, Southern Andes- Stern et al (1990); Grousset et al (1992); Basile et al (1997); Walter et al (2000); Smith et al (2003); Jeandel et al (2007), and references therein; Khondoker et al (2018); -Scotia Arc and Ridge- Jeandel et al (2007); Harrison et al (2003);-Antarctic Peninsula- Hole el al. (1993); Kosler et al (2009); Roy et al (2007); Lee et al (2005); -East Antarctica- DePaolo et al (1982); Luttinen et al (1998Luttinen et al ( , 2010; Roy et al (2007); Will et al (2010).…”

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confidence: 99%

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Radiogenic isotopic and clay mineralogical signatures of terrigenous particles as water-mass tracers: New insights into South Atlantic deep circulation during the last termination

Beny

Bout-Roumazeilles

Davies

et al. 2020

Quaternary Science Reviews

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The past evolution of the Southern Ocean, one of the major components of the climatic system, is still a matter of debate. This study provides new insights into the deep Southern Ocean circulation based on the radiogenic isotopes and clay mineralogical signature of the terrigenous fractions transported by the main deep water masses to sediments recovered in core MD07-3076Q from the central South Atlantic. This approach successfully permits: (1) provenance identification of the various grain-size fractions (clay, cohesive silt and sortable silt); (2) assignment of each grain-size fraction to a specific water-mass; (3) reconstruction of past changes in the main deep water-mass pathways. These data document the evolution of deep-water masses in the South Atlantic Ocean during the last deglaciation. The Antarctic Bottom Water (AABW) speed and northward extension were maximum at the end of the Last Glacial Maximum (LGM), associated with strong bottom water production in the Weddell Sea, together with a vigorous Lower Circumpolar Deep Water (LCDW). In contrast the North Atlantic Deep Water (NADW) circulation was weaker than today. The onset of the deglaciation (from 17.5 ka to 15 ka, ~Heinrich Stadial 1, HS 1) was marked by weakening and southerly retreat of the AABW and by an increase of mixing between AABW and LCDW. The speed of the AABW remained at its lowest during the Bølling Allerød (B/A) and the Younger Dryas (YD), and the LCDW slowed and retreated to the south, while the NADW progressively migrated southward, deepened, and strengthened between the beginning of the Bølling Allerød and the Holocene (from ~15 to 10 ka).

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Section: B Geological Settingmentioning

confidence: 74%

Section: General Settingmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Radiogenic isotopic and clay mineralogical signatures of terrigenous particles as water-mass tracers: New insights into South Atlantic deep circulation during the last termination

Beny

Bout-Roumazeilles

Davies

et al. 2020

Quaternary Science Reviews

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“…Figure 3 shows the isotopic characteristics of a three-isotope plot ( 206 Pb/ 207 Pb versus 208 Pb/ 207 Pb) of the distinctive Pb isotope fingerprints of anthropogenic Pb in the Southern Hemisphere. At the peak of leaded gasoline use in Australia, Pb isotope ratios for environmental samples were less radiogenic 206 (Puig 1988, Khondoker et al 2018. As shown in figure 3, the isotopic compositions of the snow samples were closer to those of aerosol Pb isotopes from Brazil and Chile.…”

Section: Sources Of Anthropogenic Pb In Hercules Névé Snowmentioning

confidence: 75%

Variations in lead isotopes in Antarctic snow from northern Victoria Land during 2012–2015

Han

Kim

Lee

et al. 2022

Environ. Res. Commun.

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To evaluate recent changes in anthropogenic Pb pollution and its sources and origins in Antarctica, Pb and Ba concentrations and Pb isotopic compositions were determined in a continuous series of 40 snow samples from a 2-m deep snow pit, covering 4 full years from 2011/12 summer to 2015/16 summer, at the Hercules Névé plateau in Victoria Land, Antarctica. The results show that more than 90% of the atmospheric Pb deposited in Victoria Land was of noncrustal origin. This result implies the persistence of a significant human impact on the atmospheric cycle of Pb in the most remote places on Earth, despite a substantial reduction in anthropogenic Pb emissions in the Southern Hemisphere during recent years. The Pb isotopic fingerprints indicate that South America, particularly Brazil and Chile, has become a major source of anthropogenic Pb reaching Victoria Land. Our data highlight the need for both national and international measures to further reduce Pb emissions.

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High contribution of vehicular exhaust and coal combustion to PM2.5-bound Pb pollution in an industrial city in North China: An insight from isotope

Chen

Yan²,

Hu³

et al. 2023

Atmospheric Environment

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New constraints on elemental and Pb and Nd isotope compositions of South American and Southern African aerosol sources to the South Atlantic Ocean

Cited by 15 publications

References 65 publications

Radiogenic isotopic and clay mineralogical signatures of terrigenous particles as water-mass tracers: New insights into South Atlantic deep circulation during the last termination

Radiogenic isotopic and clay mineralogical signatures of terrigenous particles as water-mass tracers: New insights into South Atlantic deep circulation during the last termination

Variations in lead isotopes in Antarctic snow from northern Victoria Land during 2012–2015

High contribution of vehicular exhaust and coal combustion to PM2.5-bound Pb pollution in an industrial city in North China: An insight from isotope

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