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| Gehlen, Marion; Rabouille, Christophe; Ezat, Ullah; Guidi-guivard, Laurence D.. |
| We report the first seasonal time-series observations of porewater composition obtained for deep-sea sediments. We observed considerable temporal variability of O-2, NO3-, and Mn2+ profiles at the French JGOFS site DYFAMED (western Mediterranean) in response to a pulsed input of organic matter. A delivery of reactive organic matter representing only 1% of the average organic C content of surface sediments (0.6% wt/wt) was required in order to fuel the observed changes in porewater composition. The perturbation resulted in dramatic changes in integrated reaction rates and sediment-water fluxes. O-2 uptake rates increased from 1.26 to 1.82 mmol m(-2) d(-1), while nitrification rates rose from 0.13 to 0.18 mmol m(-2) d(-1). These changes were paralleled by a... |
| Tipo: Text |
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| Ano: 1997 |
URL: https://archimer.ifremer.fr/doc/00240/35110/33606.pdf |
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