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Temperature effects on carbon-specific respiration rate and sinking velocity of diatom aggregates - potential implications for deep ocean export processes

Författare och institution:
M. H. Iversen (-); Helle Ploug (Institutionen för biologi och miljövetenskap)
Publicerad i:
Biogeosciences, 10 ( 6 ) s. 4073-4085
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
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.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Geovetenskap och miljövetenskap
exopolymer particles tep, nw mediterranean sea, marine snow, organic-carbon, fecal pellets, sargasso sea, interannual variability, microbial-degradation, hydrostatic-pressure, pelagic environment
Postens nummer:
Posten skapad:
2013-09-04 11:49

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