Paleodust deposition and peat accumulation rates – Bog size matters

Sjöström, Jenny K.; Cortizas, Antonio Martínez; Hansson, Sophia V.; Sánchez, Noemí; Bindler, Richard; Rydberg, Johan; Mörth, Carl‐Magnus; Ryberg, Eleonor E.; Kylander, Malin E.

doi:10.1016/j.chemgeo.2020.119795

Cited by 17 publications

(14 citation statements)

References 56 publications

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“…This holds true throughout the Holocene (Supplemental Figure 3). This strongly suggests that bogs rely on local and regional nutrient input from nearby soils and ecosystems (see text for discussion), in line with recent findings on mineral dust deposition in Swedish bogs 43 .…”

Section: Figure 1 Location Of Bog Stoichiometric Profiles and Monitosupporting

confidence: 89%

“…Earlier work noted a general concordance between rates of P accumulation in deep peat and directly-measured aerial P deposition 17,42 but the P deposition monitoring network across global peatlands is sparse. Local inputs, which have recently been shown to dominate mineral deposition in Swedish bogs 43 , are likely to be missed. Long-distance transport of fine mineral dust is important for global biogeochemical cycling 44 , but an imbalance between this flux and far higher directly-measured rates of P deposition requires additional, presumably shortdistance, aerial contributions 45 .…”

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confidence: 99%

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Phosphorus supply affects long-term carbon accumulation in mid-latitude ombrotrophic peatlands

Schillereff¹,

Chiverrell²,

Sjöström³

et al. 2022

Preprint

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is a pre-print and has not been peer-reviewed. It has been submitted to a peer-reviewed journal but we are sharing this version on EarthArXiv in the interests of open research, non-commercial publishing and timely dissemination, recognising that peer review can be a protracted process (especially during the COVID-19 pandemic). Subsequent versions of this manuscript may differ due to the editorial and review process. Should it be accepted, a link to the publisher's version will be available via the 'Peer-reviewed Publication DOI' link on the right-hand side of this webpage.

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Section: Figure 1 Location Of Bog Stoichiometric Profiles and Monitosupporting

confidence: 89%

mentioning

confidence: 99%

Phosphorus supply affects long-term carbon accumulation in mid-latitude ombrotrophic peatlands

Schillereff¹,

Chiverrell²,

Sjöström³

et al. 2022

Preprint

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“…Significant arsenic, and other elemental, contamination started at the beginning of the Anthropocene, commensurate with the beginning of early agriculture in the Stone Age. The clearing and working of land led to aeolian erosion of disturbed surfaces, with slash and burn management also giving rise to smoke production. − Bronze age metal mining and processing led to localized but highly enriched contamination with arsenic, ,,, as base and precious metal ores are often enriched in arsenic minerals . Wider-scale mining contamination occurred through the smelting of arsenical ores liberating arsenic trioxide to the atmosphere, while mining disturbance of soils and rocks causes aeolian entrainment of dust, with mine spoil containing percent levels of arsenic …”

Section: Sources and Trends In Atmospheric Arsenic And Subsequent Dep...mentioning

confidence: 99%

“…Paleodust ombrotrophic chronologies from a range of locations remote from volcanic activity, or from desert dust storm impact, all suggest that tephra and desert dust, along with charcoal indications of fire related deposition inputs, are limited, and that the bulk of dust deposited to bogs is of local or continental general soil origin. − , Enhanced dust inputs tend to be observed from the early Anthropocene, where land was cleared for agriculture, and continued to more recent agricultural expansions such as in the USA . For raised bogs, natural variation in topology and rate of bog accumulation lead to different densities of mineral dust in bog profiles, but climatic variation also has an impact . Mineral ash content tends to increase in bog profiles during dry periods when bog growth slows. , …”

Section: Sources and Trends In Atmospheric Arsenic And Subsequent Dep...mentioning

confidence: 99%

The Pedosphere as a Sink, Source, and Record of Anthropogenic and Natural Arsenic Atmospheric Deposition

Meharg¹,

Meharg²

2021

Environ. Sci. Technol.

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The Anthropocene has led to global-scale contamination of the biosphere through diffuse atmospheric dispersal of arsenic. This review considers the sources arsenic to soils and its subsequent fate, identifying key knowledge gaps. There is a particular focus on soil classification and stratigraphy, as this is central to the topic under consideration. For Europe and North America, peat core chrono-sequences record massive enhancement of arsenic depositional flux from the onset of the Industrial Revolution to the late 20th century, while modern mitigation efforts have led to a sharp decline in emissions. Recent arsenic wet and dry depositional flux measurements and modern ice core records suggest that it is South America and East Asia that are now primary global-scale polluters. Natural sources of arsenic to the atmosphere are primarily from volcanic emissions, aeolian soil dust entrainment, and microbial biomethylation. However, quantifying these natural inputs to the atmosphere, and subsequent redeposition to soils, is only starting to become better defined. The pedosphere acts as both a sink and source of deposited arsenic. Soil is highly heterogeneous in the natural arsenic already present, in the chemical and biological regulation of its mobility within soil horizons, and in interaction with climatic and geomorphological settings. Mineral soils tend to be an arsenic sink, while organic soils act as both a sink and a source. It is identified here that peatlands hold a considerable amount of Anthropocene released arsenic, and that this store can be potentially remobilized under climate change scenarios. Also, increased ambient temperature seems to cause enhanced arsine release from soils, and potentially also from the oceans, leading to enhanced rates of arsenic biogeochemical cycling through the atmosphere. With respect to agriculture, rice cultivation was identified as a particular concern in Southeast Asia due to the current high arsenic deposition rates to soil, the efficiency of arsenic assimilation by rice grain, and grain yield reduction through toxicity.

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“…However, during the last decades, the inorganic, mineral content of peat has been increasingly studied. This is mainly due to the growing interest in using peat records to trace sources of atmospheric dust [1][2][3][4], to determine the role of fresh minerals as potential fertilizers (through chemical weathering) in oligotrophic peatlands [5], or to reconstruct changes in storminess during the Holocene [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Mineral Composition of Peat by Combining FTIR-ATR and Multivariate Analysis

et al. 2021

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The mineral content of peat has received little attention until the last few decades, when peat cores have been increasingly used to study past dust deposition. Paleodust deposition is commonly reconstructed through elemental datasets, which are used to infer deposition rates, storminess patterns, mineral composition, source identification, and fertilization effects. To date, only a few studies have directly analyzed the mineralogy (by XRD and SEM) and particle size of peat mineral matter, and the conducted studies have usually been constrained by the need to remove a large amount of organic matter, which risks altering the mineral component. One alternative is to use quick, nondestructive techniques, such as FTIR-ATR, that require little sample preparation. In this study, we analyzed by FTIR-ATR both the bulk peat and ash fractions of a sequence taken in a minerogenic mire that covered a wide inorganic matter content range (6%–57%). Aided by principal component analysis on transposed IR spectral data, we were able to identify the main minerals in bulk peat and ash, quartz, mica (likely muscovite), K feldspar (likely microcline), and plagioclase (likely anorthite), which are consistent with the local geology of the mire catchment. Changes in mineral composition during the last ca. 2800 years were coeval with previously reconstructed environmental changes using the same core. Our results suggest that FTIR-ATR has great potential to investigate peat mineral matter and the processes that drive its compositional change.

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Paleodust deposition and peat accumulation rates – Bog size matters

Cited by 17 publications

References 56 publications

Phosphorus supply affects long-term carbon accumulation in mid-latitude ombrotrophic peatlands

Phosphorus supply affects long-term carbon accumulation in mid-latitude ombrotrophic peatlands

The Pedosphere as a Sink, Source, and Record of Anthropogenic and Natural Arsenic Atmospheric Deposition

Investigating the Mineral Composition of Peat by Combining FTIR-ATR and Multivariate Analysis

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