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Physical weathering intensity controls bioavailable primary iron(II) silicate content in major global dust sources

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Physical weathering intensity controls bioavailable primary iron(II) silicate content in major global dust sources. / Shoenfelt, Elizabeth; Winkler, Gisela; Annett, Amber L; Hendry, Katharine R; Bostick, Benajmin C.

In: Geophysical Research Letters, Vol. 46, No. 19, 16.10.2019, p. 10854-10864.

Research output: Contribution to journalArticle

Harvard

Shoenfelt, E, Winkler, G, Annett, AL, Hendry, KR & Bostick, BC 2019, 'Physical weathering intensity controls bioavailable primary iron(II) silicate content in major global dust sources', Geophysical Research Letters, vol. 46, no. 19, pp. 10854-10864. https://doi.org/10.1029/2019GL084180

APA

Shoenfelt, E., Winkler, G., Annett, A. L., Hendry, K. R., & Bostick, B. C. (2019). Physical weathering intensity controls bioavailable primary iron(II) silicate content in major global dust sources. Geophysical Research Letters, 46(19), 10854-10864. https://doi.org/10.1029/2019GL084180

Vancouver

Shoenfelt E, Winkler G, Annett AL, Hendry KR, Bostick BC. Physical weathering intensity controls bioavailable primary iron(II) silicate content in major global dust sources. Geophysical Research Letters. 2019 Oct 16;46(19):10854-10864. https://doi.org/10.1029/2019GL084180

Author

Shoenfelt, Elizabeth ; Winkler, Gisela ; Annett, Amber L ; Hendry, Katharine R ; Bostick, Benajmin C. / Physical weathering intensity controls bioavailable primary iron(II) silicate content in major global dust sources. In: Geophysical Research Letters. 2019 ; Vol. 46, No. 19. pp. 10854-10864.

Bibtex

@article{57ae6b563d444adeb9a8dc1360234098,
title = "Physical weathering intensity controls bioavailable primary iron(II) silicate content in major global dust sources",
abstract = "The speciation of iron (Fe) reaching the ocean, for instance in wind-blown dust and coastal sediments, impacts its bioavailability to phytoplankton and its impact on atmospheric carbon dioxide (CO2) and climate. For dust reaching the Southern Ocean, primary Fe(II) silicates that are physically weathered from bedrock are highly bioavailable compared to more chemically weathered, Fe(III)-rich species, suggesting that weathering in dust source regions impacts the bioavailable Fe supply. However, this phenomenon has not been studied in other important terrestrial Fe sources, where weathering regimes and source geology vary. Here, we use Fe X-ray absorption spectroscopy on marine sediment cores to show that major global dust and sediment sources impacted by high physical weathering contain abundant primary minerals, and thus are overlooked as a source of highly bioavailable Fe globally. Thus, it is important to consider the role of physical versus chemical weathering in Fe fertilization and biotic CO2 cycling.",
keywords = "dust, iron, physical weathering, bioavailability, mineralogy, carbon cycle",
author = "Elizabeth Shoenfelt and Gisela Winkler and Annett, {Amber L} and Hendry, {Katharine R} and Bostick, {Benajmin C}",
year = "2019",
month = "10",
day = "16",
doi = "10.1029/2019GL084180",
language = "English",
volume = "46",
pages = "10854--10864",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "19",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Physical weathering intensity controls bioavailable primary iron(II) silicate content in major global dust sources

AU - Shoenfelt, Elizabeth

AU - Winkler, Gisela

AU - Annett, Amber L

AU - Hendry, Katharine R

AU - Bostick, Benajmin C

PY - 2019/10/16

Y1 - 2019/10/16

N2 - The speciation of iron (Fe) reaching the ocean, for instance in wind-blown dust and coastal sediments, impacts its bioavailability to phytoplankton and its impact on atmospheric carbon dioxide (CO2) and climate. For dust reaching the Southern Ocean, primary Fe(II) silicates that are physically weathered from bedrock are highly bioavailable compared to more chemically weathered, Fe(III)-rich species, suggesting that weathering in dust source regions impacts the bioavailable Fe supply. However, this phenomenon has not been studied in other important terrestrial Fe sources, where weathering regimes and source geology vary. Here, we use Fe X-ray absorption spectroscopy on marine sediment cores to show that major global dust and sediment sources impacted by high physical weathering contain abundant primary minerals, and thus are overlooked as a source of highly bioavailable Fe globally. Thus, it is important to consider the role of physical versus chemical weathering in Fe fertilization and biotic CO2 cycling.

AB - The speciation of iron (Fe) reaching the ocean, for instance in wind-blown dust and coastal sediments, impacts its bioavailability to phytoplankton and its impact on atmospheric carbon dioxide (CO2) and climate. For dust reaching the Southern Ocean, primary Fe(II) silicates that are physically weathered from bedrock are highly bioavailable compared to more chemically weathered, Fe(III)-rich species, suggesting that weathering in dust source regions impacts the bioavailable Fe supply. However, this phenomenon has not been studied in other important terrestrial Fe sources, where weathering regimes and source geology vary. Here, we use Fe X-ray absorption spectroscopy on marine sediment cores to show that major global dust and sediment sources impacted by high physical weathering contain abundant primary minerals, and thus are overlooked as a source of highly bioavailable Fe globally. Thus, it is important to consider the role of physical versus chemical weathering in Fe fertilization and biotic CO2 cycling.

KW - dust

KW - iron

KW - physical weathering

KW - bioavailability

KW - mineralogy

KW - carbon cycle

U2 - 10.1029/2019GL084180

DO - 10.1029/2019GL084180

M3 - Article

VL - 46

SP - 10854

EP - 10864

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 19

ER -