Nutrient mineralization rates and ratios in the eastern South Atlantic
Article first published online: 26 MAY 2004
Copyright 2004 by the American Geophysical Union.
Journal of Geophysical Research: Oceans (1978–2012)
Volume 109, Issue C5, May 2004
How to Cite
2004), Nutrient mineralization rates and ratios in the eastern South Atlantic, J. Geophys. Res., 109, C05030, doi:10.1029/2003JC002051., , , , , , and (
- Issue published online: 26 MAY 2004
- Article first published online: 26 MAY 2004
- Manuscript Accepted: 25 MAR 2004
- Manuscript Revised: 10 MAR 2004
- Manuscript Received: 17 JUL 2003
- water masses;
- biogeochemical cycles;
- South Atlantic
 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 × 10−2 μmol P kg−1 yr−1) and subequatorial (5.3 × 10−2 μmol P kg−1 yr−1) than in the subtropical (4.3 × 10−2 μmol 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 × 10−2 μmol P kg−1 yr−1). Significant variation with depth of O2/C/N/P anomalies indicates preferential mineralization of proteins in thermocline waters, as compared with the reference Redfield composition.