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Silicon isotope and silicic acid uptake in surface waters of Marguerite Bay, West Antarctic Peninsula

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Silicon isotope and silicic acid uptake in surface waters of Marguerite Bay, West Antarctic Peninsula. / Cassarino, Lucie; Hendry, Kate; Meredith, Michael; Venables, Hugh J.; de la Rocha, Christina.

In: Deep Sea Research Part II: Topical Studies in Oceanography, Vol. 139, 05.2017, p. 143-150.

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Harvard

Cassarino, L, Hendry, K, Meredith, M, Venables, HJ & de la Rocha, C 2017, 'Silicon isotope and silicic acid uptake in surface waters of Marguerite Bay, West Antarctic Peninsula', Deep Sea Research Part II: Topical Studies in Oceanography, vol. 139, pp. 143-150. https://doi.org/10.1016/j.dsr2.2016.11.002

APA

Cassarino, L., Hendry, K., Meredith, M., Venables, H. J., & de la Rocha, C. (2017). Silicon isotope and silicic acid uptake in surface waters of Marguerite Bay, West Antarctic Peninsula. Deep Sea Research Part II: Topical Studies in Oceanography, 139, 143-150. https://doi.org/10.1016/j.dsr2.2016.11.002

Vancouver

Cassarino L, Hendry K, Meredith M, Venables HJ, de la Rocha C. Silicon isotope and silicic acid uptake in surface waters of Marguerite Bay, West Antarctic Peninsula. Deep Sea Research Part II: Topical Studies in Oceanography. 2017 May;139:143-150. https://doi.org/10.1016/j.dsr2.2016.11.002

Author

Cassarino, Lucie ; Hendry, Kate ; Meredith, Michael ; Venables, Hugh J. ; de la Rocha, Christina. / Silicon isotope and silicic acid uptake in surface waters of Marguerite Bay, West Antarctic Peninsula. In: Deep Sea Research Part II: Topical Studies in Oceanography. 2017 ; Vol. 139. pp. 143-150.

Bibtex

@article{b039fa5b03a64298a953e294dc51be41,
title = "Silicon isotope and silicic acid uptake in surface waters of Marguerite Bay, West Antarctic Peninsula",
abstract = "The silicon isotope composition (δ30Si) of dissolved silicon (DSi) and biogenic silica (BSi) provides information about the silicon cycle and its role in oceanic carbon uptake in the modern ocean and in the past. However, there are still questions outstanding regarding the impact of processes such as oceanic mixing, export and dissolution on the isotopic signature of seawater, and the impacts on sedimentary BSi. This study reports the δ30Si of DSi from surface waters at the Rothera Time Series (RaTS) site, Ryder Bay, in a coastal region of the West Antarctic Peninsula (WAP). The samples were collected at the end of austral spring through the end of austral summer/beginning of autumn over two field seasons, 2004/5 and 2005/6. Broadly, for both field seasons, DSi diminished and δ30Si of DSi increased through the summer, but this was accomplished during only a few short periods of net nutrient drawdown. During these periods, the δ30Si of DSi was negatively correlated with DSi concentrations. The Si isotope fractionation factor determined for the net nutrient drawdown periods, ɛuptake, was in the range of -2.26 to -1.80 ‰ when calculated using an open system model and -1.93 to -1.33 ‰ when using a closed system model. These estimates of ɛ are somewhat higher than previous studies that relied on snapshots in time rather than following changes in δ30Si and DSi over time, which therefore were more likely to include the effects of mixing of dissolved silicon up into the mixed layer. Results highlight also that, even at the same station and within a single growing season, the apparent fractionation factor may exhibit significant temporal variability because of changes in the extent of biological removal of DSi, nutrient source, siliceous species, and mixing events.Paleoceanographic studies using silicon isotopes need careful consideration in the light of our new results.",
keywords = "Silicon, Isotopes, Fractionation, Time series, Ryder Bay , Southern Ocean",
author = "Lucie Cassarino and Kate Hendry and Michael Meredith and Venables, {Hugh J.} and {de la Rocha}, Christina",
year = "2017",
month = "5",
doi = "10.1016/j.dsr2.2016.11.002",
language = "English",
volume = "139",
pages = "143--150",
journal = "Deep Sea Research Part II: Topical Studies in Oceanography",
issn = "0967-0645",
publisher = "Elsevier",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Silicon isotope and silicic acid uptake in surface waters of Marguerite Bay, West Antarctic Peninsula

AU - Cassarino, Lucie

AU - Hendry, Kate

AU - Meredith, Michael

AU - Venables, Hugh J.

AU - de la Rocha, Christina

PY - 2017/5

Y1 - 2017/5

N2 - The silicon isotope composition (δ30Si) of dissolved silicon (DSi) and biogenic silica (BSi) provides information about the silicon cycle and its role in oceanic carbon uptake in the modern ocean and in the past. However, there are still questions outstanding regarding the impact of processes such as oceanic mixing, export and dissolution on the isotopic signature of seawater, and the impacts on sedimentary BSi. This study reports the δ30Si of DSi from surface waters at the Rothera Time Series (RaTS) site, Ryder Bay, in a coastal region of the West Antarctic Peninsula (WAP). The samples were collected at the end of austral spring through the end of austral summer/beginning of autumn over two field seasons, 2004/5 and 2005/6. Broadly, for both field seasons, DSi diminished and δ30Si of DSi increased through the summer, but this was accomplished during only a few short periods of net nutrient drawdown. During these periods, the δ30Si of DSi was negatively correlated with DSi concentrations. The Si isotope fractionation factor determined for the net nutrient drawdown periods, ɛuptake, was in the range of -2.26 to -1.80 ‰ when calculated using an open system model and -1.93 to -1.33 ‰ when using a closed system model. These estimates of ɛ are somewhat higher than previous studies that relied on snapshots in time rather than following changes in δ30Si and DSi over time, which therefore were more likely to include the effects of mixing of dissolved silicon up into the mixed layer. Results highlight also that, even at the same station and within a single growing season, the apparent fractionation factor may exhibit significant temporal variability because of changes in the extent of biological removal of DSi, nutrient source, siliceous species, and mixing events.Paleoceanographic studies using silicon isotopes need careful consideration in the light of our new results.

AB - The silicon isotope composition (δ30Si) of dissolved silicon (DSi) and biogenic silica (BSi) provides information about the silicon cycle and its role in oceanic carbon uptake in the modern ocean and in the past. However, there are still questions outstanding regarding the impact of processes such as oceanic mixing, export and dissolution on the isotopic signature of seawater, and the impacts on sedimentary BSi. This study reports the δ30Si of DSi from surface waters at the Rothera Time Series (RaTS) site, Ryder Bay, in a coastal region of the West Antarctic Peninsula (WAP). The samples were collected at the end of austral spring through the end of austral summer/beginning of autumn over two field seasons, 2004/5 and 2005/6. Broadly, for both field seasons, DSi diminished and δ30Si of DSi increased through the summer, but this was accomplished during only a few short periods of net nutrient drawdown. During these periods, the δ30Si of DSi was negatively correlated with DSi concentrations. The Si isotope fractionation factor determined for the net nutrient drawdown periods, ɛuptake, was in the range of -2.26 to -1.80 ‰ when calculated using an open system model and -1.93 to -1.33 ‰ when using a closed system model. These estimates of ɛ are somewhat higher than previous studies that relied on snapshots in time rather than following changes in δ30Si and DSi over time, which therefore were more likely to include the effects of mixing of dissolved silicon up into the mixed layer. Results highlight also that, even at the same station and within a single growing season, the apparent fractionation factor may exhibit significant temporal variability because of changes in the extent of biological removal of DSi, nutrient source, siliceous species, and mixing events.Paleoceanographic studies using silicon isotopes need careful consideration in the light of our new results.

KW - Silicon

KW - Isotopes

KW - Fractionation

KW - Time series

KW - Ryder Bay

KW - Southern Ocean

U2 - 10.1016/j.dsr2.2016.11.002

DO - 10.1016/j.dsr2.2016.11.002

M3 - Article

VL - 139

SP - 143

EP - 150

JO - Deep Sea Research Part II: Topical Studies in Oceanography

JF - Deep Sea Research Part II: Topical Studies in Oceanography

SN - 0967-0645

ER -