Extracting paleodust information from peat geochemistry

Vleeschouwer, François De; Ferrat, Mélodie; McGowan, Hamish A.; Vanneste, Helen; Weiss, Dominik

doi:10.22498/pages.22.2.88

Cited by 9 publications

(5 citation statements)

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“…Recently, there has been an increased interest in using peatlands as archives of past variability in atmospheric dust deposition (De Vleeschouwer et al, 2014). Ombrotrophic peatlands (peat bogs) receive their nutrients and water exclusively from atmospheric deposition (Chambers and Charman, 2004).…”

Section: Introductionmentioning

confidence: 99%

Late-Holocene atmospheric dust deposition in eastern Canada (St. Lawrence North Shore)

2016

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Dust deposition in two ombrotrophic peatlands (Baie and Ile du Havre peatland (IDH) bogs) of the Estuary and Gulf of the St. Lawrence in eastern Canada was reconstructed using elemental geochemistry. The rare earth elements (REEs) and other lithogenic element concentrations were measured by ICP-oES and Q-ICP-MS along two peat cores spanning the last 4000 years. Principal component analyses on the geochemical profiles show that REEs display the same behavior as Al, Ti, Sc, and Zr, all conservative elements, which suggests that REEs are immobile in the studied peat bogs and can be used as tracers of dust deposition. Plant macrofossils were also used to infer past environmental and humidity changes. The dust fluxes were reconstructed using the sum of REEs (ΣREE). The range of dust deposition varies from 0.2 to 3.8 g m−2 yr−1 in the Baie bog, while the IDH bog shows lower fluxes ranging between 0.1 and 1.2 g m−2 yr−1. The highest dust fluxes in the Baie bog were recorded from 1750–1000 cal. BP to 600–100 cal. BP and occur at the same time as periods of high variability in the macrofossil record (i.e. successive layers dominated by Sphagnum or Ericaceae). The timing of these events in the dust and macrofossil records also corresponds to documented cold periods. These two periods have been identified as episodes of climatic instability, which could have been caused by changes in the wind regime.

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Section: Introductionmentioning

confidence: 99%

Late-Holocene atmospheric dust deposition in eastern Canada (St. Lawrence North Shore)

2016

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“…Peatlands are important palaeoenvironmental and palaeoclimatic archives which offer a wide range of proxies (geochemical, biological and physical) and chronologies extending as far back as the late Pleistocene. This potentially allows the investigation of the interactions between dust and past environmental and climatic conditions/processes at various time and spatial scales (De Vleeschouwer et al, 2014a; Ferrat et al, 2012a, 2012b; Kylander et al, 2007; Pratte et al, 2017; Shotyk et al, 2001; Vanneste et al, 2016; Weiss et al, 2002b). While atmospheric dust studies have mainly focused on ombrotrophic peatlands (i.e.…”

Section: Introductionmentioning

confidence: 99%

14 kyr of atmospheric mineral dust deposition in north-eastern China: A record of palaeoclimatic and palaeoenvironmental changes in the Chinese dust source regions

et al. 2019

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A multi-proxy record of Holocene and late-Pleistocene aeolian mineral dust is reconstructed using a combination of geochemical (trace elements), mineralogical and grain-size analyses on cores from the Hani peatland in north-eastern (NE) China. The dust record displays a sharp increase in dust deposition during the late Holocene in comparison to the rest of the Holocene. This trend is in line with climatic records from the Chinese dust source regions and their downwind areas, which generally show an increase in aridity and aeolian activity during the late Holocene. The larger part of the Chinese dust source regions experienced a gradual increase in effective moisture and vegetation cover reaching maxima during the middle Holocene (6.0–8.0 kyr cal. BP) co-occurring with the minima in dust deposition in Hani. These changes in the dust source regions are likely to have been modulated by the variations in the East Asian summer monsoon (EASM), which is the principal mechanism controlling climate in the region. The intensified EASM during the middle Holocene is also likely to have resulted in a sediment recharge at the margin of the Chinese drylands providing additional material and enhancing the atmospheric dust load after the late-Holocene aridification of the region. Combined together, these changes promoted a remobilization of dust sources increasing the amount of material available for transport by the East Asian winter monsoon (EAWM) and the Westerlies. Human activities might also have played a role in the increased dust emissions during the late Holocene, but further research is needed to assess the extent of those impacts at a regional level.

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“…offer great potential to investigate the multiple cause and effect relationships between dust and environmental processes – including human activities – from local, regional to global scales (e.g. Allan et al, 2013; Björck et al, 2012; De Vleeschouwer et al, 2014; Kylander et al, 2013, 2016; Marx et al, 2008, 2009; Shotyk et al, 2001; Silva-Sánchez et al, 2015; Vanneste et al, 2016). Peatlands are abundant in temperate and boreal areas, but these regions are often overlooked in dust research, despite the many potential dust sources they host (e.g.…”

Section: Introductionmentioning

confidence: 99%

Holocene atmospheric dust deposition in NW Spain

et al. 2019

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Atmospheric dust plays an important role in terrestrial and marine ecosystems, particularly those that are nutrient limited. Despite that most dust originates from arid and semi-arid regions, recent research has shown that past dust events may have been involved in boosting productivity in nutrient-poor peatlands. We investigated dust deposition in a mid-latitude, raised bog, which is surrounded by a complex geology (paragneiss/schist, granite, quartzite and granodiorite). As proxies for dust fluxes, we used accumulation rates of trace (Ti, Zr, Rb, Sr and Y) as well as major (K and Ca) lithogenic elements. The oldest, largest dust deposition event occurred between ~8.6 and ~7.4 ka BP, peaking at ~8.1 ka BP (most probably the 8.2 ka BP event). The event had a large impact on the evolution of the mire, which subsequently transitioned from a fen into a raised bog in ~1500 years. From ~6.7 to ~4.0 ka BP, fluxes were very low, coeval with mid-Holocene forest stability and maximum extent. In the late Holocene, after ~4.0 ka BP, dust events became more prevalent with relatively major deposition at ~3.2–2.5, ~1.4 ka BP and ~0.35–0.05 ka BP, and minor peaks at ~4.0–3.7, ~1.7, ~1.10–0.95 ka BP and ~0.74–0.58 ka BP. Strontium fluxes display a similar pattern between ~11 and ~6.7 ka BP but then became decoupled from the other elements from the mid Holocene onwards. This seems to be a specific signal of the granodiorite batholith, which has an Sr anomaly. The reconstructed variations in dust fluxes bear a strong climatic imprint, probably related to storminess controlled by North Atlantic Oscillation conditions. Complex interactions also arise because of increased pressure from human activities.

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Extracting paleodust information from peat geochemistry

Cited by 9 publications

References 0 publications

Late-Holocene atmospheric dust deposition in eastern Canada (St. Lawrence North Shore)

Late-Holocene atmospheric dust deposition in eastern Canada (St. Lawrence North Shore)

14 kyr of atmospheric mineral dust deposition in north-eastern China: A record of palaeoclimatic and palaeoenvironmental changes in the Chinese dust source regions

Holocene atmospheric dust deposition in NW Spain

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