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| Naqvi, Wa. |
| Utilizing all the available data, the distribution of nitrite at the secondary nitrite maximum is studied to delineate the boundaries of the denitrification zone and to understand some of the processes that control the extent of denitrification in the Arabian Sea. Nitrite distribution shows little correspondence with primary productivity, and the three major sites of seasonal upwelling appear to be located outside the zone of intense denitrification. This distinguishes the Arabian Sea from the other two major oceanic denitrification sites, located in the Pacific Ocean. The relationship between nitrite and nitrate deficit suggests that the distribution of the former effectively reflects the extent of denitrification. The locus of the most intense... |
| Tipo: Text |
Palavras-chave: ARABIAN SEA; DENITRIFICATION; PRIMARY PRODUCTION; SURFACE CIRCULATION; WINTER CONVECTION. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00101/21257/18870.pdf |
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| Raymond, N; Bonin, P; Bertrand, Jc. |
| Different types of denitrification rates in coastal marine sediments from the Western Mediterranean coast (France) were simultaneously determined by varioUS C2H2 inhibition techniques: in situ denitrifying activity in intact cores or sediment slurries; DEA (Denitrifying Enzyme Assays); and potential activity. Denitrifying activity was also estimated by the use of kinetic parameters (Km and V(max)). Values for denitrifying activities in the top two centimetres ranged from 0 to 50-mu-moles of nitrous oxide produced per litre of sediment per day, and were similar when intact core or sediment slurries were used. DEA showed comparable values for all the study sites. The potential activity ranged from 298-600-mu-moles per litre per day. Estimated activity based... |
| Tipo: Text |
Palavras-chave: DENITRIFICATION; C2H2 BLOCKAGE; MARINE SEDIMENT; MEDITERRANEAN. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/00100/21148/18767.pdf |
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