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| Fe-binding organic ligands in coastal and frontal regions of the western Antarctic Peninsula Ardiningsih, I.; Seyitmuhammedov, K.; Sander, S.G.; Stirling, C.H.; Reichart, G.-J.; Arrigo, K.R.; Gerringa, L.J.A.; Middag, R. (2021). Fe-binding organic ligands in coastal and frontal regions of the western Antarctic Peninsula. Biogeosciences 18(15): 4587-4601. https://dx.doi.org/10.5194/bg-18-4587-2021
Bijhorende data:
In: Gattuso, J.P.; Kesselmeier, J. (Ed.) Biogeosciences. Copernicus Publications: Göttingen. ISSN 1726-4170; e-ISSN 1726-4189, meer
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| Abstract |
t]) were between 1.2 and 6.4 nM eq. Fe. The organic ligands offshore ranged between 1.0 and 3.0 nM eq. Fe. The southern boundary of the Antarctic Circumpolar Current (SB ACC) separated the organic ligands on the shelf from bloom-associated ligands offshore. Overall, organic ligand concentrations always exceeded DFe concentrations (excess ligand concentration, [ L′] = 0.8–5.0 nM eq. Fe). The [ L′] made up to 80 % of [ Lt], suggesting that any additional Fe input can be stabilized in the dissolved form via organic complexation. The denser modified Circumpolar Deep Water (mCDW) on the shelf showed the highest complexation capacity of Fe ( αFe'L; the product of [ L′] and conditional binding strength of ligands, KcondFe'L). Since Fe is also supplied by shelf sediments and glacial discharge, the high complexation capacity over the shelf can keep Fe dissolved and available for local primary productivity later in the season upon sea-ice melting. |
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