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

Research output: Contribution to journalArticle

1 Citation (Scopus)
24 Downloads (Pure)

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 languageEnglish
Pages (from-to)6765-6774
Number of pages10
JournalGeophysical Research Letters
Volume46
Issue number12
Early online date4 Jun 2019
DOIs
Publication statusPublished - 28 Jun 2019

Keywords

  • autumn
  • bloom
  • coastal
  • diatoms
  • dissolution
  • silica

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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