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Measurements of formation, degradation, and sinking velocity of diatom aggregates from laboratory studies performed at 15 °C and 4 °C

Most deep ocean carbon flux profiles show low and almost constant fluxes of particulate organic carbon (POC) in the deep ocean. However, the reason for the non-changing POC fluxes at depths is unknown. This study presents direct measurements of formation, degradation, and sinking velocity of diatom aggregates from laboratory studies performed at 15 °C and 4 °C during a three-week experiment. The average carbon-specific respiration rate during the experiment was 0.12 ± 0.03 at 15 °C, and decreased 3.5-fold when the temperature was lowered to 4 °C. No direct influence of temperature on aggregate sinking speed was observed. Using the remineralisation rate measured at 4 °C and an average particle sinking speed of 150 m d**-1, calculated carbon fluxes were similar to those collected in deep ocean sediment traps from a global data set, indicating that temperature plays a major role for deep ocean fluxes of POC.

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Cite this as

Iversen, Morten Hvitfeldt, Ploug, Helle (2013). Dataset: Measurements of formation, degradation, and sinking velocity of diatom aggregates from laboratory studies performed at 15 °C and 4 °C. https://doi.org/10.1594/PANGAEA.828266

DOI retrieved: 2013

Additional Info

Field Value
Imported on November 30, 2024
Last update November 30, 2024
License CC-BY-3.0
Source https://doi.org/10.1594/PANGAEA.828266
Author Iversen, Morten Hvitfeldt
Given Name Morten Hvitfeldt
Family Name Iversen
More Authors
Ploug, Helle
Source Creation 2013
Publication Year 2013
Resource Type application/zip - filename: Iversen_2013
Subject Areas
Name: Ecology

Name: Lithosphere

Related Identifiers
Title: Temperature effects on carbon-specific respiration rate and sinking velocity of diatom aggregates - potential implications for deep ocean export processes
Identifier: https://doi.org/10.5194/bg-10-4073-2013
Type: DOI
Relation: IsSupplementTo
Year: 2013
Source: Biogeosciences
Authors: Iversen Morten Hvitfeldt , Ploug Helle .