Dissolution dominates silica cycling in a shelf sea autumn bloom
| Autor: | Joanne Hopkins, Julianne U. Wihsgott, E. Malcolm S. Woodward, Alex J. Poulton, Kyle M.J. Mayers, Mark C. Stinchcombe, Chris J. Daniels, Claire E. Widdicombe |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
010504 meteorology & atmospheric sciences
biology Biogenic silica 010502 geochemistry & geophysics biology.organism_classification 01 natural sciences Geophysics Diatom Environmental chemistry Phytoplankton Temperate climate General Earth and Planetary Sciences Environmental science Cycling Bloom Dissolution 0105 earth and related environmental sciences |
| Zdroj: | Geophysical Research Letters |
| Popis: | 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 (−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. |
| Databáze: | OpenAIRE |
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