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Retention of dissolved iron and FeII in an iron induced Southern Ocean phytoplankton bloom

journal contribution
posted on 2023-05-16, 14:03 authored by Croot, PL, Andrew BowieAndrew Bowie, Frew, RD, Maldonado, MT, Hall, JA, Safi, KL, Roche, JL, Boyd, PW, Law, CS
During the 13 day Southern Ocean Iron RElease 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.

History

Publication title

Geophysical Research Letters

Volume

28

Issue

18

Pagination

3425-3428

ISSN

0094-8276

Department/School

Institute for Marine and Antarctic Studies

Publisher

American Geophysical Union

Place of publication

Washington

Repository Status

  • Restricted

Socio-economic Objectives

Measurement and assessment of marine water quality and condition

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