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Dissolution dominates silica cycling in a shelf sea autumn bloom

Dissolution dominates silica cycling in a shelf sea autumn bloom
Dissolution dominates silica cycling in a shelf sea autumn bloom

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 day−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·day−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.

autumn, bloom, coastal, diatoms, dissolution, silica
0094-8276
6765-6774
Poulton, Alex J.
14bf64a7-d617-4913-b882-e8495543e717
Mayers, Kyle M.J.
9841ee5d-63fb-441e-a5e7-5b611468723d
Daniels, Christopher J.
e4a51f9d-efe6-413a-8d3f-3f1eda5ce79f
Stinchcombe, Mark C.
433dd398-15f7-4730-9f1e-992d65bec70b
Woodward, E. Malcolm S.
3a11b7bf-b110-448a-b1ee-ae1ce7d0fef5
Hopkins, Joanne
d477d6d1-e91f-4ef7-9c56-50e3e7cbf7be
Wihsgott, Julianne U.
75d7b518-11df-4729-8b23-96b9ac6164de
Widdicombe, Claire E.
43b3ea18-b072-4f05-bda8-58a79aaf82ce
Poulton, Alex J.
14bf64a7-d617-4913-b882-e8495543e717
Mayers, Kyle M.J.
9841ee5d-63fb-441e-a5e7-5b611468723d
Daniels, Christopher J.
e4a51f9d-efe6-413a-8d3f-3f1eda5ce79f
Stinchcombe, Mark C.
433dd398-15f7-4730-9f1e-992d65bec70b
Woodward, E. Malcolm S.
3a11b7bf-b110-448a-b1ee-ae1ce7d0fef5
Hopkins, Joanne
d477d6d1-e91f-4ef7-9c56-50e3e7cbf7be
Wihsgott, Julianne U.
75d7b518-11df-4729-8b23-96b9ac6164de
Widdicombe, Claire E.
43b3ea18-b072-4f05-bda8-58a79aaf82ce

Poulton, Alex J., Mayers, Kyle M.J., Daniels, Christopher J., Stinchcombe, Mark C., Woodward, E. Malcolm S., Hopkins, Joanne, Wihsgott, Julianne U. and Widdicombe, Claire E. (2019) Dissolution dominates silica cycling in a shelf sea autumn bloom. Geophysical Research Letters, 46 (12), 6765-6774. (doi:10.1029/2019GL083558).

Record type: Article

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 day−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·day−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.

Text
Poulton et al 2019 Geophysical Research Letters - Version of Record
Available under License Creative Commons Attribution.
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Accepted/In Press date: 29 May 2019
e-pub ahead of print date: 4 June 2019
Published date: 28 June 2019
Keywords: autumn, bloom, coastal, diatoms, dissolution, silica

Identifiers

Local EPrints ID: 433204
URI: https://eprints.soton.ac.uk/id/eprint/433204
ISSN: 0094-8276
PURE UUID: ec3a2004-e311-4e70-ae3f-f1248d0f9c4b

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Date deposited: 12 Aug 2019 16:30
Last modified: 02 Dec 2019 17:33

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Contributors

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

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