An evaluation of Australia as a major source of dust

Deckker, Patrick De

doi:10.1016/j.earscirev.2019.01.008

Cited by 34 publications

(41 citation statements)

References 87 publications

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“…A prominent role for this source region has been suggested previously based on Nd and Sr isotope compositions of bulk sediment samples from the central South Pacific 42 . Supporting evidence is provided by the remarkable resemblance of Nd and Sr isotope compositions in the Lake Eyre Basin (ɛ Nd of −4.1 ± 2.0 and 87 Sr/ 86 Sr of 0.7112 ± 0.0038, 2 SD, n = 17) 29,40 with < 10 µm fraction samples from the eastern Tasman Sea (ɛ Nd of −5.1 ± 1.4 and 87 Sr/ 86 Sr of 0.7115 ± 0.0012, 2 SD, n = 2) 40 (Supplementary Table 2) and our LGM dust samples (Fig. 2).…”

Section: Resultsmentioning

confidence: 84%

“…Australia hosts geochemically diverse source areas 29,32,40 dominating the dust deposition in the mid-latitude South Pacific in the present day 15,32,34 . The Nd isotope compositions of PSAs in West (ɛ Nd of −17 ± 8.3, 2 SD, n = 21) and South Australia (ɛ Nd of −12.2 ± 6.1, 2 SD, n = 38) (Supplementary Table 2) 29,40 are inconsistent with the observed endmember ɛ Nd range between− 4 and~−6. The large Murray and Darling river basins in East Australia have been considered as important dust source regions during the last glacial period 29,52,53 .…”

Section: Resultsmentioning

confidence: 99%

“…Air parcel trajectories suggest that dust emissions from all continental dust sources in the mid-latitude Southern Hemisphere, including New Zealand, can contribute to the total dust flux to the Southern Ocean 16 . However, Australia and South America are typically considered the most prominent dust sources in the Southern Hemisphere, hosting multiple dust source regions in their (semi) arid continental interior and on the eastern side of the Andes, respectively [26][27][28][29] . The modern dust emissions from terrestrial source regions in the Southern Hemisphere have been traced downwind using their distinct geochemical fingerprints 28,[30][31][32][33][34][35] .…”

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A circumpolar dust conveyor in the glacial Southern Ocean

et al. 2020

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The increased flux of soluble iron (Fe) to the Fe-deficient Southern Ocean by atmospheric dust is considered to have stimulated the net primary production and carbon export, thus promoting atmospheric CO2 drawdown during glacial periods. Yet, little is known about the sources and transport pathways of Southern Hemisphere dust during the Last Glacial Maximum (LGM). Here we show that Central South America (~24‒32°S) contributed up to ~80% of the dust deposition in the South Pacific Subantarctic Zone via efficient circum-Antarctic dust transport during the LGM, whereas the Antarctic Zone was dominated by dust from Australia. This pattern is in contrast to the modern/Holocene pattern, when South Pacific dust fluxes are thought to be primarily supported by Australian sources. Our findings reveal that in the glacial Southern Ocean, Fe fertilization critically relies on the dynamic interaction of changes in dust-Fe sources in Central South America with the circumpolar westerly wind system.

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confidence: 84%

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confidence: 99%

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A circumpolar dust conveyor in the glacial Southern Ocean

et al. 2020

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“…The presence of low amounts of kaolinite during the Holocene and of chlorite during the last glacial period suggests a possible contribution from relatively low latitude sources during the current interglacial. In southeast Australia, and in particular in the internal drainage basins of Lake Eyre and Murray‐Darling Basin supplying the majority of the Australian dust today (De Deckker, ; Stancin et al, ), kaolinite and illite are the primary clays, but smectite is also abundant (Gingele & De Deckker, ). Loess deposits of the South Island of New Zealand (Lewis & Ekdale, ) include illite, kaolinite, and to a lesser extent smectite.…”

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confidence: 99%

Aeolian Dust Provenance in Central East Antarctica During the Holocene: Environmental Constraints From Single‐Grain Raman Spectroscopy

Paleari

Delmonte

Andó

et al. 2019

Geophysical Research Letters

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We analyzed the single‐grain mineralogical composition of aeolian dust transported to central East Antarctica for provenance purposes. Comparison with data from the last glacial period shows for the first time disappearance of carbonates during the Holocene related to sea level rise and suppressed deflation from the Argentinean continental shelf, exposed during Marine Isotope Stage 2. Zeolites, related to alteration of volcanic glass in the subglacial/periglacial environment of Patagonia, show a similar behavior. The remaining minerals, remarkably similar between the two climatic periods, are compatible with a Pampean and Patagonian provenance, but Holocene data show a more pronounced volcanic and metamorphic imprint and presence of minerals related to warm climate weathering environments compatible with an additional contribution from subtropical latitudes of South America. These results do not imply a major large‐scale reorganization of atmospheric circulation after the last climatic transition.

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“…Location of studied river particulate samples in the Murray-Darling Basin (MDB) and marine sediment core MD03-2607. The range of neodymium isotopic compositions (ε Nd ) for MDB suspended particulates (stars) and clay-size fractions (Gingele and De Deckker, 2005a;circles), and southern Australian dust sources (De Deckker et al, 2014;De Deckker, 2019;triangles) are also represented. LEB refers to Lake Eyre Basin.…”

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confidence: 99%

Preferential Riverine Export of Fine Volcanogenic Particles to the Southeast Australian Margin

et al. 2020

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We report on rare earth element and neodymium isotopic compositions in a series of grain-size fractions separated from river suspended matter in the Murray-Darling Basin (MDB) and a nearby marine sediment core (MD03-2607) offshore southeastern Australia. This source-to-sink approach was used to further investigate the extent to which sediment sorting may control the geochemistry of suspended loads in rivers, and to provide constraints on the source of the detrital sediment material exported to the ocean. Our results provide further compelling evidence that significant sizedependent geochemical decoupling can occur in river systems, accounting here for Nd isotopic (ε Nd) differences of up to eight epsilon-units between silt (>25 µm) and colloidal (0.2−0.006 µm; 0.006−0.003 µm) fractions. All suspended particulate samples from the River Murray watershed display a trend toward more radiogenic (higher ε Nd) Nd signatures with decreasing grain-size, in addition to differing REE signatures, which collectively point toward a preferential volcanogenic origin for the fine-grained inorganic particles transported by MDB rivers. Furthermore, we show that the same river-borne volcanogenic material dominates in the fine-grained detrital fractions extracted from core MD03-2607 at the southeastern Australian margin; a finding corroborated by REE signatures in a series of copepod fecal pellet separates from the same core. Collectively, our results suggest that river sediment discharge is accompanied by preferential export of fine-grained volcanogenic particles to the ocean. This potential source of bioavailable trace metals and nutrients in ocean surface waters could impact marine productivity.

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An evaluation of Australia as a major source of dust

Cited by 34 publications

References 87 publications

A circumpolar dust conveyor in the glacial Southern Ocean

A circumpolar dust conveyor in the glacial Southern Ocean

Aeolian Dust Provenance in Central East Antarctica During the Holocene: Environmental Constraints From Single‐Grain Raman Spectroscopy

Preferential Riverine Export of Fine Volcanogenic Particles to the Southeast Australian Margin

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