Dissolution Dominates Silica Cycling in a Shelf Sea Autumn Bloom

Alex J. Poulton; Kyle M. J. Mayers; Chris J. Daniels; Mark C. Stinchcombe; E. Malcolm S. Woodward; Joanne Hopkins; Julianne U. Wihsgott; Claire E. Widdicombe

doi:10.1029/2019GL083558

Dissolution Dominates Silica Cycling in a Shelf Sea Autumn Bloom

Alex J. Poulton, Kyle M. J. Mayers, Chris J. Daniels, Mark C. Stinchcombe, E. Malcolm S. Woodward, Joanne Hopkins, Julianne U. Wihsgott, Claire E. Widdicombe

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Abstract

Autumn phytoplankton blooms represent key periods of production in temperate and high-latitude seas. Biogenic silica (bSiO2) production, dissolution and standing stocks were determined in the Celtic Sea (United Kingdom) during November 2014. Dissolution rates were in excess of bSiO2 production, indicating a net loss of bSiO2. Estimated diatom bSiO2 contributed ≤10% to total bSiO2, with detrital bSiO2 supporting rapid Si-cycling. Based on the average biomass-specific dissolution rate (0.2 d-1), 3 weeks would be needed to dissolve 99% of the bSiO2 present. Negative net bSiO2 production was associated with low-light conditions (<4 E m-2 d-1). Our observations imply that dissolution dominates Si-cycling during autumn, with low-light conditions also likely to influence Si-cycling during winter and early spring.

Original language	English
Pages (from-to)	6765-6774
Number of pages	10
Journal	Geophysical Research Letters
Volume	46
Issue number	12
Early online date	4 Jun 2019
DOIs	https://doi.org/10.1029/2019GL083558
Publication status	Published - 28 Jun 2019

Keywords

autumn
bloom
coastal
diatoms
dissolution
silica

ASJC Scopus subject areas

Geophysics
Earth and Planetary Sciences(all)

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Cite this

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title = "Dissolution Dominates Silica Cycling in a Shelf Sea Autumn Bloom",

abstract = "Autumn phytoplankton blooms represent key periods of production in temperate and high-latitude seas. Biogenic silica (bSiO2) production, dissolution and standing stocks were determined in the Celtic Sea (United Kingdom) during November 2014. Dissolution rates were in excess of bSiO2 production, indicating a net loss of bSiO2. Estimated diatom bSiO2 contributed ≤10% to total bSiO2, with detrital bSiO2 supporting rapid Si-cycling. Based on the average biomass-specific dissolution rate (0.2 d-1), 3 weeks would be needed to dissolve 99% of the bSiO2 present. Negative net bSiO2 production was associated with low-light conditions (<4 E m-2 d-1). Our observations imply that dissolution dominates Si-cycling during autumn, with low-light conditions also likely to influence Si-cycling during winter and early spring. ",

keywords = "autumn, bloom, coastal, diatoms, dissolution, silica",

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AU - Poulton, Alex J.

AU - Mayers, Kyle M. J.

AU - Daniels, Chris J.

AU - Stinchcombe, Mark C.

AU - Woodward, E. Malcolm S.

AU - Hopkins, Joanne

AU - Wihsgott, Julianne U.

AU - Widdicombe, Claire E.

PY - 2019/6/28

Y1 - 2019/6/28

N2 - Autumn phytoplankton blooms represent key periods of production in temperate and high-latitude seas. Biogenic silica (bSiO2) production, dissolution and standing stocks were determined in the Celtic Sea (United Kingdom) during November 2014. Dissolution rates were in excess of bSiO2 production, indicating a net loss of bSiO2. Estimated diatom bSiO2 contributed ≤10% to total bSiO2, with detrital bSiO2 supporting rapid Si-cycling. Based on the average biomass-specific dissolution rate (0.2 d-1), 3 weeks would be needed to dissolve 99% of the bSiO2 present. Negative net bSiO2 production was associated with low-light conditions (<4 E m-2 d-1). Our observations imply that dissolution dominates Si-cycling during autumn, with low-light conditions also likely to influence Si-cycling during winter and early spring.

AB - Autumn phytoplankton blooms represent key periods of production in temperate and high-latitude seas. Biogenic silica (bSiO2) production, dissolution and standing stocks were determined in the Celtic Sea (United Kingdom) during November 2014. Dissolution rates were in excess of bSiO2 production, indicating a net loss of bSiO2. Estimated diatom bSiO2 contributed ≤10% to total bSiO2, with detrital bSiO2 supporting rapid Si-cycling. Based on the average biomass-specific dissolution rate (0.2 d-1), 3 weeks would be needed to dissolve 99% of the bSiO2 present. Negative net bSiO2 production was associated with low-light conditions (<4 E m-2 d-1). Our observations imply that dissolution dominates Si-cycling during autumn, with low-light conditions also likely to influence Si-cycling during winter and early spring.

KW - autumn

KW - bloom

KW - coastal

KW - diatoms

KW - dissolution

KW - silica

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DO - 10.1029/2019GL083558

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JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 12

ER -

Dissolution Dominates Silica Cycling in a Shelf Sea Autumn Bloom

Abstract

Keywords

ASJC Scopus subject areas

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