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

被引:122
作者
Croot, PL
Bowie, AR
Frew, RD
Maldonado, MT
Hall, JA
Safi, KA
La Roche, J
Boyd, PW
Law, CS
机构
[1] Netherlands Inst Sea Res, NIOZ, Marine Chem & Geol Dept, NL-1790 AB Den Burg, Texel, Netherlands
[2] Univ Plymouth, Plymouth Environm Res Ctr, Dept Environm Sci, Plymouth PL4 8AA, Devon, England
[3] Univ Otago, Dept Chem, NIWA Ctr Chem & Phys Oceanog, Dunedin, New Zealand
[4] NIWA, Hamilton, New Zealand
[5] Plymouth Marine Lab, Ctr Coastal & Marine Studies, Plymouth PL1 3DH, Devon, England
[6] McGill Univ, Dept Biol, Montreal, PQ H2T 2V8, Canada
[7] Univ Kiel, Inst Meereskunde, D-24105 Kiel, Germany
关键词
D O I
10.1029/2001GL013023
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
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 Fe-II) 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 Fe-II, but as such levels persisted overnight (8 hr dark period) - ten times the half-life for this species - a maintenance mechanism (complexation of Fe-II) is required, and is supported by evidence of increased ligand concentrations on day 12. The source of these ligands and their affinity for Fe-II 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.
引用
收藏
页码:3425 / 3428
页数:4
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