Journal
BIOGEOSCIENCES
Volume 10, Issue 6, Pages 4073-4085Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/bg-10-4073-2013
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Funding
- Helmholtz Association
- Alfred Wegener Institute for Polar and Marine Research
- DFG-Research Center/Cluster of Excellence The Ocean in the Earth System
- Swedish Research Council (VR) [621-2011-4406]
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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 degrees C and 4 degrees C during a three-week experiment. The average carbon-specific respiration rate during the experiment was 0.12+/-0.03 at 15 degrees C, and decreased 3.5-fold when the temperature was lowered to 4 degrees C. No direct influence of temperature on aggregate sinking speed was observed. Using the remineralisation rate measured at 4 degrees 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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