Geochemical evidence of denitrification in the Benguela upwelling system
| dc.contributor.author | Tyrrell, Toby | |
| dc.contributor.author | Lucas, Michael I | |
| dc.date.accessioned | 2018-06-07T08:46:07Z | |
| dc.date.available | 2018-06-07T08:46:07Z | |
| dc.date.issued | 2002 | |
| dc.date.updated | 2016-01-14T06:46:19Z | |
| dc.description.abstract | This paper presents analysis of nitrate, phosphate and silicate data from the Benguela upwelling system. Evidence is presented that suggests denitrification occurring close to shore, and also nutrient trapping. Denitrification leaves an imprint on the water properties in terms of a nitrate deficit, that is to say nitrate concentrations that are significantly less than predicted by multiplying the phosphate concentrations by the Redfield ratio. It is probable that denitrification also causes a decoupling of nitrate and carbon compared to Redfield processes, and large-scale losses of nitrate in the Benguela which are not accompanied by losses of carbon. Nitrate-driven CO2 drawdown following upwelling will be less than it might otherwise be, because of denitrification. Nutrient trapping (secondary remineralisation) is apparent as enhanced phosphate concentrations, some of which are several Full-size image (<1 K) higher than in the offshore source waters for upwelling. Waters also become enriched in silicate and to a lesser extent nitrate as they advect across the shelf. By implication the same process should also “supercharge” waters in dissolved inorganic carbon, leading to stronger outgassing of CO2 immediately after upwelling. The effect is again to increase the size of the estimated Benguela upwelling system CO2 source. | |
| dc.identifier | http://dx.doi.org/10.1016/S0278-4343(02)00077-8 | |
| dc.identifier.apacitation | Tyrrell, T., & Lucas, M. I. (2002). Geochemical evidence of denitrification in the Benguela upwelling system. <i>Continental Shelf Research</i>, http://hdl.handle.net/11427/28243 | en_ZA |
| dc.identifier.chicagocitation | Tyrrell, Toby, and Michael I Lucas "Geochemical evidence of denitrification in the Benguela upwelling system." <i>Continental Shelf Research</i> (2002) http://hdl.handle.net/11427/28243 | en_ZA |
| dc.identifier.citation | Tyrrell, T., & Lucas, M. I. (2002). Geochemical evidence of denitrification in the Benguela upwelling system. Continental Shelf Research, 22(17), 2497-2511. | |
| dc.identifier.ris | TY - AU - Tyrrell, Toby AU - Lucas, Michael I AB - This paper presents analysis of nitrate, phosphate and silicate data from the Benguela upwelling system. Evidence is presented that suggests denitrification occurring close to shore, and also nutrient trapping. Denitrification leaves an imprint on the water properties in terms of a nitrate deficit, that is to say nitrate concentrations that are significantly less than predicted by multiplying the phosphate concentrations by the Redfield ratio. It is probable that denitrification also causes a decoupling of nitrate and carbon compared to Redfield processes, and large-scale losses of nitrate in the Benguela which are not accompanied by losses of carbon. Nitrate-driven CO2 drawdown following upwelling will be less than it might otherwise be, because of denitrification. Nutrient trapping (secondary remineralisation) is apparent as enhanced phosphate concentrations, some of which are several Full-size image (<1 K) higher than in the offshore source waters for upwelling. Waters also become enriched in silicate and to a lesser extent nitrate as they advect across the shelf. By implication the same process should also “supercharge” waters in dissolved inorganic carbon, leading to stronger outgassing of CO2 immediately after upwelling. The effect is again to increase the size of the estimated Benguela upwelling system CO2 source. DA - 2002 DB - OpenUCT DP - University of Cape Town J1 - Continental Shelf Research LK - https://open.uct.ac.za PB - University of Cape Town PY - 2002 T1 - Geochemical evidence of denitrification in the Benguela upwelling system TI - Geochemical evidence of denitrification in the Benguela upwelling system UR - http://hdl.handle.net/11427/28243 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/28243 | |
| dc.identifier.vancouvercitation | Tyrrell T, Lucas MI. Geochemical evidence of denitrification in the Benguela upwelling system. Continental Shelf Research. 2002; http://hdl.handle.net/11427/28243. | en_ZA |
| dc.language.iso | eng | |
| dc.publisher.department | Department of Biological Sciences | en_ZA |
| dc.publisher.faculty | Faculty of Science | en_ZA |
| dc.publisher.institution | University of Cape Town | |
| dc.source | Continental Shelf Research | |
| dc.source.uri | https://www.journals.elsevier.com/continental-shelf-research/ | |
| dc.subject.other | Denitrification | |
| dc.subject.other | Nutrient trapping | |
| dc.subject.other | Nitrate deficit | |
| dc.subject.other | Nitrate | |
| dc.subject.other | Phosphate | |
| dc.title | Geochemical evidence of denitrification in the Benguela upwelling system | |
| dc.type | Journal Article | |
| uct.type.filetype | Text | |
| uct.type.filetype | Image |