Characterization of ocean biogeochemical processes: a generalized total least-squares estimator of the Redfield ratios
V. Guglielmi1,2, C. Goyet1,2, and F. Touratier1,21Images Espace-Dev, University of Perpignan 52, Avenue P. Alduy, 66860 Perpignan, France 2Espace-Dev UMR UG UA UM IRD, Maison de la télédétection, 500 rue J.-F. Breton, 34093 Montpellier, France
Received: 16 Oct 2015 – Accepted for review: 25 Oct 2015 – Discussion started: 17 Nov 2015
Abstract. The chemical composition of the global ocean is governed by biological, chemical and physical processes. These processes interact with each other so that the concentrations of carbon dioxide, oxygen, nitrate and phosphate vary in constant proportions, referred to as the Redfield ratios. We build here the Generalized Total Least-Squares estimator of these ratios. The interest of our approach is twofold: it respects the hydrological characteristics of the studied areas, and it can be applied identically in any area where enough data are available. The tests performed on the Atlantic Ocean highlight a variability of the Redfield ratios, both with geographical location and with depth. This variability emphasizes the importance of local and accurate estimates of Redfield ratios.
Guglielmi, V., Goyet, C., and Touratier, F.: Characterization of ocean biogeochemical processes: a generalized total least-squares estimator of the Redfield ratios, Earth Syst. Dynam. Discuss., 6, 2383-2416, doi:10.5194/esdd-6-2383-2015, 2015.