 |
| Titel |
Temperature effects on carbon-specific respiration rate and sinking velocity of diatom aggregates – potential implications for deep ocean export processes |
| VerfasserIn |
M. H. Iversen, H. Ploug |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 6 ; Nr. 10, no. 6 (2013-06-20), S.4073-4085 |
| Datensatznummer |
250018301
|
| Publikation (Nr.) |
 copernicus.org/bg-10-4073-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| 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. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|