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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
1999
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| Accesso online: | https://doi.org/10.1594/PANGAEA.185044 |
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| _version_ | 1867171452404367360 |
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| author | Bianchi, Micheline Fosset, Christine Conan, Pascal |
| author_facet | Bianchi, Micheline Fosset, Christine Conan, Pascal |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | During spring, ammonium oxidation and nitrite oxidation rates were measured in the NW basin of the Mediterranean Sea, from mesotrophic sites (Ligurian Sea and Gulf of Lions) to oligotrophic sites (Balearic Islands). Nitrification rates (average values for 37 measurements) ranged from 72 to 144 nmol of N oxidised/l/d, except in the Rhône River plume area where the rates increased to 264-504 nmol/l/d because of the riverine inputs of nitrogen. Maximal rates were located around the peak of nitrite within the nitracline at about 40 to 60 m and just above the phosphacline. At 1 station, relatively high values of nitrification (50 to 130 nmol/l/d) were also measured deep in the water column (240 m). Day-to-day variations were measured demonstrating the response within a few hours to hydrological stress (wind-induced mixing of the water column) and showing the role of hydrological characteristics on the distribution of nitrification rates. Because of the homogenous temperature (13°C) in the Mediterranean Sea, the spatial (geographical and vertical) fluctuations of nitrifying rates were linked to the presence of substrate due to mineralisation processes and/or Rhône River inputs. We estimate the contribution of nitrate produced by nitrification to the N demand of phytoplankton to range from 16% at mesotrophic to 61% at oligotrophic stations. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_185044 |
| institution | PANGAEA |
| language | en |
| publishDate | 1999 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Nitrification rates in the NW Mediterranean Sea Bianchi, Micheline Fosset, Christine Conan, Pascal Ammonium uptake rate; Biogeochemical Processes in the Oceans and Fluxes; Calculated, see reference(s); CTD/Rosette; CTD-RO; DATE/TIME; DEPTH, water; DYNAPROC; DYNAPROC_107; DYNAPROC_110; DYNAPROC_115; DYNAPROC_129; DYNAPROC_133; DYNAPROC_138; DYNAPROC_141; DYNAPROC_247; DYNAPROC_252; DYNAPROC_256; DYNAPROC_260; DYNAPROC_270; DYNAPROC_275; DYNAPROC_279; DYNAPROC_284; Event label; JGOFS; Joint Global Ocean Flux Study; Latitude of event; Le Suroît; Longitude of event; Nitrite uptake rate; PROOF During spring, ammonium oxidation and nitrite oxidation rates were measured in the NW basin of the Mediterranean Sea, from mesotrophic sites (Ligurian Sea and Gulf of Lions) to oligotrophic sites (Balearic Islands). Nitrification rates (average values for 37 measurements) ranged from 72 to 144 nmol of N oxidised/l/d, except in the Rhône River plume area where the rates increased to 264-504 nmol/l/d because of the riverine inputs of nitrogen. Maximal rates were located around the peak of nitrite within the nitracline at about 40 to 60 m and just above the phosphacline. At 1 station, relatively high values of nitrification (50 to 130 nmol/l/d) were also measured deep in the water column (240 m). Day-to-day variations were measured demonstrating the response within a few hours to hydrological stress (wind-induced mixing of the water column) and showing the role of hydrological characteristics on the distribution of nitrification rates. Because of the homogenous temperature (13°C) in the Mediterranean Sea, the spatial (geographical and vertical) fluctuations of nitrifying rates were linked to the presence of substrate due to mineralisation processes and/or Rhône River inputs. We estimate the contribution of nitrate produced by nitrification to the N demand of phytoplankton to range from 16% at mesotrophic to 61% at oligotrophic stations. |
| title | Nitrification rates in the NW Mediterranean Sea |
| topic | Ammonium uptake rate; Biogeochemical Processes in the Oceans and Fluxes; Calculated, see reference(s); CTD/Rosette; CTD-RO; DATE/TIME; DEPTH, water; DYNAPROC; DYNAPROC_107; DYNAPROC_110; DYNAPROC_115; DYNAPROC_129; DYNAPROC_133; DYNAPROC_138; DYNAPROC_141; DYNAPROC_247; DYNAPROC_252; DYNAPROC_256; DYNAPROC_260; DYNAPROC_270; DYNAPROC_275; DYNAPROC_279; DYNAPROC_284; Event label; JGOFS; Joint Global Ocean Flux Study; Latitude of event; Le Suroît; Longitude of event; Nitrite uptake rate; PROOF |
| url | https://doi.org/10.1594/PANGAEA.185044 |