Retention of dissolved iron and FeII in an iron induced Southern Ocean phytoplankton bloom
- 15 September 2001
- journal article
- Published by American Geophysical Union (AGU) in Geophysical Research Letters
- Vol. 28 (18) , 3425-3428
- https://doi.org/10.1029/2001gl013023
Abstract
During the 13 day Southern Ocean Iron RE‐lease Experiment (SOIREE), dissolved iron concentrations decreased rapidly following each of three iron‐enrichments, but remained high (>1 nM, up to 80% as FeII) after the fourth and final enrichment on day 8. The former trend was mainly due to dilution (spreading of iron‐fertilized waters) and particle scavenging. The latter may only be explained by a joint production‐maintenance mechanism; photoreduction is the only candidate process able to produce sufficiently high FeII, but as such levels persisted overnight (8 hr dark period) —ten times the half—life for this species—a maintenance mechanism (complexation of FeII) is required, and is supported by evidence of increased ligand concentrations on day 12. The source of these ligands and their affinity for FeII is not known. This retention of iron probably permitted the longevity of this bloom raising fundamental questions about iron cycling in HNLC (High Nitrate Low Chlorophyll) Polar waters.Keywords
This publication has 24 references indexed in Scilit:
- The fate of added iron during a mesoscale fertilisation experiment in the Southern OceanDeep Sea Research Part II: Topical Studies in Oceanography, 2001
- A mesoscale phytoplankton bloom in the polar Southern Ocean stimulated by iron fertilizationNature, 2000
- Importance of stirring in the development of an iron-fertilized phytoplankton bloomNature, 2000
- Determination of Iron Speciation by Cathodic Stripping Voltammetry in Seawater Using the Competing Ligand 2-(2-Thiazolylazo)-p-cresol (TAC)Electroanalysis, 2000
- Complex lessons of iron uptakeNature, 1999
- The behaviour of iron and other trace elements during the IronEx-I and PlumEx experiments in the Equatorial PacificDeep Sea Research Part II: Topical Studies in Oceanography, 1998
- A massive phytoplankton bloom induced by an ecosystem-scale iron fertilization experiment in the equatorial Pacific OceanNature, 1996
- Role of protozoan grazing in relieving iron limitation of phytoplanktonNature, 1996
- Grazer-mediated regeneration and assimilation of Fe, Zn and Mn from planktonic preyMarine Ecology Progress Series, 1994
- Investigations of iron coordination and redox reactions in seawater using 59Fe radiometry and ion-pair solvent extraction of amphiphilic iron complexesMarine Chemistry, 1992