units are given below the parameter name "see for detailed information paper Marine Chemistry:Fe organic complexation in the Ross Sea . L.J.A. Gerringa, P. Laan , K.R. Arrigo, G.L. van Dijken, A.-C. Alderkamp " NA Not Analysed Water sample parameter quality flag definition after parameter column flag value Definition 1 Sample was drawn, but parameter value not jet received 2 Acceptable measurement 3 Questionable measurement 4 Bad measurement 5 Not Reported 6 Mean of replicate measurements 7 Manual chromatographic peak measurement 8 Irregular chromatographic peak integration 9 Sample not drawn for measurement of this parameter Nutrients: Filtered samples for silicate (Si(OH)4) were stored at 4°. Samples for nitrate (NO3-), nitrite (NO2-) and phosphate (PO43-) were stored frozen. After the cruise, they were analysed colorimetrically on a Bran and Luebbe trAAcs 800 Autoanalyzer in the NIOZ nutrient laboratory (Grasshoff et al., 1983). Grasshoff, K., Ehrhard, M., Kremling, K.,1983. Methods of seawater analysis. Weinheim: Verlag Chemie GmbH. 419 p. Pigments: Seawater samples for chlorophyll a (Chl a) and phaeophytin a were filtered onto 25 mm Whatman GF/F filters, extracted overnight at 4°C in 5 mL of 90% acetone, and analyzed on a Turner Model 10AU fluorometer before and after acidification (Holm-Hansen et al., 1965). Holm-Hansen O, Lorenzen C, Holmes RW, Strickland JDH. 1965. Fluorometric determination of chlorophyll in Chlorophyta, Chrysophyta, Phaeophyta, Pyrrophyta. J Cons Perm Inter Explor Mer 30: 3–15. DFe: DFe was analysed in samples that were acidified after filtration, stored at 4 degrees Celsius DFe concentrations were measured directly on board by the automated Flow Injection Analysis (FIA) method (Klunder et al., 2011) after being acidified for at least 18 hours (Seastar© baseline hydrochloric acid; pH 1.7) Klunder MB, Laan P, Middag R, De Baar HJW, van Ooijen JC (2011). Dissolved iron in the Southern Ocean (Atlantic sector). Deep Sea Res II 58: 2678–2694. DFe-binding organic ligands : Organic complexation of Fe was determined in filtered samples by CLE-CSV using 2-(2-Thiazolylazo)-p-cresol (TAC) as a competing ligand (Croot and Johansson, 2000). Croot, P.L., Johanson M., 2000. Electroanalysis 12, 565-576. Samples for speciation were analysed as soon as possible and if they had to wait longer than 4 days they were stored frozen. DFE_LIGANDS samples were taken when speciation analyses was done from bottle with speciation samples and acidified at that moment. LOGK logarithm (10) of the conditional stability constant K' (M-1) assuming that 1 ligand exists LOGK_FLAG_W LOGK_DOWN_STDEV Since K' is log transformed the standard deviation (STDEV) to lower and to upper values is asymmetric, , LOGK_downSTDEV_FLAG_W therefore two stdev values, one to lower (DOWN) and to upper (UP) values LOGK_UP_STDEV LOGK_upSTDEV_FLAG_W LT_CONC concentration of dissolved organic Fe binding ligands in nanoequivalent of M Fe (nEq of M Fe), assuming 1 ligand exists LT_CONC_FLAG_W LT_CONC_STDEV LT_CONC_STDEV_FLAG_W DFE_LIGANDS Dissolved Fe measured in unacidified samples, samples taken just before ligand analysis DFE_LIGANDS_FLAG_W DFE_LIGANDS_STDEV DFE_LIGANDS_STDEV_FLAG_W LOGK1 logarithm (10) of the conditional stability constant K' (M-1) of the strong ligand (L1) assuming that 2 ligand exist LOGK1_FLAG_W LOGK1_DOWN_STDEV LOGK1_downSTDEV_FLAG_W LOGK1_UP_STDEV LOGK1_upSTDEV_FLAG_W LOGK2 logarithm (10) of the conditional stability constant K' (M-1) of the weak ligand (L2) assuming that 2 ligand exist LOGK2_FLAG_W LOGK2_DOWN_STDEV LOGK2_downSTDEV_FLAG_W