Redfield ratios revisited: Removing the biasing effect of anthropogenic CO2

Redfield ratios of remineralization are calculated based on chemical data a nalysis on isopycnal surfaces. The concentrations of dissolved inorganic ca rbon used in this study were corrected for the anthropogenic CO2 content as estimated with a back-calculation technique. The corrections increased the apparent carbon remineralization by 25-30%, thus proving important for the reliable estimation of Redfield carbon ratios in the presence of anthropog enic CO2. Best estimates from this study largely confirm the more recently published Redfield ratios of remineralization. The following results were o btained for the latitude range 3-41 degreesN along 20-29 degreesW in the No rtheast Atlantic Ocean: C-org:P ratio = 123 + 10; C-org:N ratio = 7.2 +/- 0 .8; -O-2:C-org ratio = 1.34 +/- 0.06; -O-2:P ratio = 165 +/- 15; N:P ratio = 17.5 +/- 2.0. These ratios are in close agreement with the average compos ition of phytoplankton and represent respiration of organic matter consisti ng on average of 52% protein. 36% polysaccharide, and 12% lipid.