Nutrient mineralization rates and ratios in the eastern South Atlantic - art. no. C05030
| Type | Article | ||||||||
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| Date | 2004-05 | ||||||||
| Language | English | ||||||||
| Author(s) | Brea Samenta, Alvarez Salgado X, Alvarez M, Perez F, Memery L, Mercier Herle , Messias M.J. |
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| Affiliation(s) | Inst Invest Marinas Punta Betin, Consejo Super Invest Cient, E-36208 Vigo, Almeria, Spain. UPMC, IRD, CNRS,Lab Oceanog Dynam & Climatol, Inst Pierre Simon Laplace, F-75252 Paris 05, France. IFREMER, Ctr Brest, UBO, CNRS,Lab Phys Oceans, F-29280 Plouzane, France. Univ E Anglia, Sch Environm Sci, Norwich NR4 7TJ, Norfolk, England. |
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| Source | Journal of Geophysical Union - Research C - Oceans (0148-0227) (American Geophysical Union), 2004-05 , Vol. 109 , N. C5 , P. NIL_29-NIL_43 | ||||||||
| DOI | 10.1029/2003JC002051 | ||||||||
| WOS© Times Cited | 23 | ||||||||
| Keyword(s) | South Atlantic, Biogeochemical cycles, Water masses | ||||||||
| Abstract | The physical and biogeochemical components of nutrients and inorganic carbon distributions along WOCE line A14 are objectively separated by means of a constrained least-squares regression analysis of the mixing of eastern South Atlantic water masses. Contrary to previous approaches, essentially devoted to the intricate South Atlantic circulation, this work is focused on the effects of circulation on nutrients and carbon biogeochemistry, with special emphasis on the stoichiometry and the rate of mineralization processes. Combination of nutrient and apparent CFC-age anomalies, derived from the mixing analysis, indicate faster mineralization rates in the equatorial (12 x 10(-2) mumol P kg(-1) yr(-1)) and subequatorial (5.3 x 10(-2) mumol P kg(-1) yr(-1)) than in the subtropical (4.3 x 10(-2) mumol P kg(-1) yr(-1)) regime at the South Atlantic Central Water (SACW) depth range. Lower rates are obtained in the Antarctic Intermediate Water (AAIW) domain (3.0 x 10(-2) mumol P kg(-1) yr(-1)). Significant variation with depth of O-2/C/N/P anomalies indicates preferential mineralization of proteins in thermocline waters, as compared with the reference Redfield composition. | ||||||||
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