Testing Iron Stable Isotope Ratios as a Signature of Biomass Burning

Kurisu, Masamitsu; Takahashi, Yoshio

doi:10.3390/atmos10020076

Cited by 9 publications

(10 citation statements)

References 58 publications

(141 reference statements)

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“…The muted impact of dust dFe on δ 56 Fe diss is due to its (near‐zero) crustal endmember; therefore, dust dFe acts as a “buffer” on δ 56 Fe diss . The effect of wildfires on δ 56 Fe diss is also limited compared to other dFe sources due to its low deposition flux in the area and years studied and a relatively‐moderate endmember (−0.5‰), which may be heavier still if soil‐Fe entrainment (with crustal δ 56 Fe) contributes substantially to wildfire Fe (Kurisu & Takahashi, 2019). The impact of the isotopically‐light anthropogenic endmember on δ 56 Fe diss is most pronounced in open ocean areas and in late summer, when the mixed layer is shallowest (Figures 3 and S1 in Supporting Information ), and increases substantially with a lighter choice of endmember (Section 4.2).…”

Section: Resultsmentioning

confidence: 99%

Surface Ocean Biogeochemistry Regulates the Impact of Anthropogenic Aerosol Fe Deposition on the Cycling of Iron and Iron Isotopes in the North Pacific

König

Hamilton

Tagliabue

2022

Geophysical Research Letters

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Distinctively‐light isotopic signatures associated with Fe released from anthropogenic activity have been used to trace basin‐scale impacts. However, this approach is complicated by the way Fe cycle processes modulate oceanic dissolved Fe (dFe) signatures (δ56Fediss) post deposition. Here we include dust, wildfire, and anthropogenic aerosol Fe deposition in a global ocean biogeochemical model with active Fe isotope cycling, to quantify how anthropogenic Fe impacts surface ocean dFe and δ56Fediss. Using the North Pacific as a natural laboratory, the response of dFe, δ56Fediss, and primary productivity are spatially and seasonally variable and do not simply follow the footprint of atmospheric deposition. Instead, the effect of anthropogenic Fe is regulated by the biogeochemical regime, specifically the degree of Fe limitation and rates of primary production. Overall, we find that while δ56Fediss does trace anthropogenic input, the response is muted by fractionation during phytoplankton uptake, but amplified by other isotopically‐light Fe sources.

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Section: Resultsmentioning

confidence: 99%

Surface Ocean Biogeochemistry Regulates the Impact of Anthropogenic Aerosol Fe Deposition on the Cycling of Iron and Iron Isotopes in the North Pacific

König

Hamilton

Tagliabue

2022

Geophysical Research Letters

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“…To prevent damage to the PTFE sampler, the air temperature was kept below 300°C by gradually adding small amounts of foliage to the fuel bed until the sample was consumed. Recent studies suggest that reed fires may be on the order of 300–500°C (Kurisu & Takahashi, 2019). Although the temperature in our experiments may be low compared to what would be expected in a crown forest fire, the sample was left until completely burned.…”

Section: Methodsmentioning

confidence: 99%

“…We provide a first‐order estimate of global plant‐derived Fe from biomass burning by burning plants representative of distinct biomes. A significant limitation of previous work is that each study could only focus on a single combustion event (Kurisu & Takahashi, 2019; Paris et al., 2010; Siefert et al., 1996) and therefore could not provide a global perspective or differentiate among different types of biomass burnings (e.g., reed, savannah, pine, etc). Our study investigates vegetation representative of four regions: temperate/boreal, humid tropical, arid tropical, and grassland.…”

Section: Introductionmentioning

confidence: 99%

“…However, it is hard to distinguish what fraction of this Fe comes from the combusted plant material and how much Fe is contributed from soil suspended in uplifting currents. A few prior studies attempted to isolate the foliage fraction: A field study on a reed combustion fire found that most of the Fe liberated during the event was derived from soil suspension, not from the plant material itself (Kurisu & Takahashi, 2019). Similarly, Wang et al.…”

Section: Introductionmentioning

confidence: 99%

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Up in Smoke: Most Aerosolized Fe From Biomass Burning Does Not Derive From Foliage

Tegler,

Sherry,

Herckes

et al. 2023

Global Biogeochemical Cycles

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Iron (Fe) is a limiting micronutrient in many marine ecosystems. The lack of sufficient Fe can stunt marine productivity and limit carbon sequestration from the atmosphere to the ocean. Recent studies suggest that biomass burning represents an important Fe source to the marine environment because pyrogenic particles have enhanced solubility after atmospheric processing. We examined foliage representative of four distinct biomes subject to frequent burning events, including boreal/temporal forests, humid tropical, arid tropical, and grassland. We burned these samples in the absence of soil to isolate the Fe from the fine particle (PM2.5) fraction that is derived directly from the burning foliage. We find that <1.5 % of the Fe in plant matter is aerosolized throughout the burn in the fine fraction. We estimate that between 2 and 9 % of the Fe released from biomass burning can be attributed to the fine fraction of the foliage itself, and < 50 % from foliage overall. Most of the Fe aerosolized during biomass burning is accounted for by soil‐suspended particles.

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“…8,24 Low Fe isotopic compositions have been observed in plants (δ 56 Fe = −1.64 to +0.17‰), 38,39 however, particulates sourced from wildfire events contain substantial soil-derived material which may drive the Fe isotopic compositions of wildfire aerosols to be closer to soil or crustal values. 40 The Fe isotopic composition of this type of biomass-burning aerosol is still relatively unconstrained.…”

Section: Introductionmentioning

confidence: 99%

Role of Source, Mineralogy, and Organic Complexation on Lability and Fe Isotopic Composition of Terrestrial Fe sources to the Gulf of Alaska

Huang,

Aarons,

Koffman

et al. 2024

ACS Earth Space Chem.

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Iron (Fe) is a key trace nutrient supporting marine primary production, and its deposition in the surface ocean can impact multiple biogeochemical cycles. Understanding Fe cycling in the subarctic is key for tracking the fate of particulate-bound sources of oceans in a changing climate. Recently, Fe isotope ratios have been proposed as a potential tool to trace sources of Fe to the marine environment. Here, we investigate the Fe isotopic composition of terrestrial sources of Fe including glacial sediment, loess, volcanic ash, and wildfire aerosols, all from Alaska. Results show that the δ 56 Fe values of glaciofluvial silt, glacial dissolved load, volcanic ash, and wildfire aerosols fall in a restricted range of δ 56 Fe values from −0.02 to +0.12‰, in contrast to the broader range of Fe isotopic compositions observed in loess, −0.50 to +0.13‰. The Fe isotopic composition of the dissolved load of glacial meltwater was consistently lighter compared to its particulate counterpart. The 'aging' (exposure to environmental conditions) of volcanic ash did not significantly fractionate the Fe isotopic composition. The Fe isotopic composition of wildfire aerosols collected during an active fire season in Alaska in the summer of 2019 was not significantly fractionated from those of the average upper continental crust composition. We find that the δ 56 Fe values of loess (<5 μm fraction) were more negative (−0.32 to +0.05‰) with respect to all samples measured here, had the highest proportion of easily reducible Fe (5.9−59.6%), and were correlated with the degree of chemical weathering and organic matter content. Transmission electron spectroscopy measurements indicate an accumulation of amorphous Fe phases in the loess. Our results indicate that Fe isotopes can be related to Fe lability when in the presence of organic matter and that higher organic matter content is associated with a distinctly more negative Fe isotope signature likely due to Fe-organic complexation.

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Testing Iron Stable Isotope Ratios as a Signature of Biomass Burning

Cited by 9 publications

References 58 publications

Surface Ocean Biogeochemistry Regulates the Impact of Anthropogenic Aerosol Fe Deposition on the Cycling of Iron and Iron Isotopes in the North Pacific

Surface Ocean Biogeochemistry Regulates the Impact of Anthropogenic Aerosol Fe Deposition on the Cycling of Iron and Iron Isotopes in the North Pacific

Up in Smoke: Most Aerosolized Fe From Biomass Burning Does Not Derive From Foliage

Role of Source, Mineralogy, and Organic Complexation on Lability and Fe Isotopic Composition of Terrestrial Fe sources to the Gulf of Alaska

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