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Croot, Peter L; Bowie, Andrew R; Frew, Russell; Maldonado, Maria T; Hall, Julie A; Safi, Karl A; La Roche, Julie; Boyd, Philip W; Law, Cliff S (2014): Dissolved iron and Fe(II) in an iron induced Southern Ocean phytoplankton bloom measured during TANGAROA cruise SOIREE. PANGAEA, https://doi.org/10.1594/PANGAEA.832530, Supplement to: Croot, PL et al. (2001): Retention of dissolved iron and Fe II in an iron induced Southern Ocean phytoplankton bloom. Geophysical Research Letters, 28(18), 3425-3428, https://doi.org/10.1029/2001GL013023

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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.
Coverage:
Median Latitude: -60.984458 * Median Longitude: 140.018708 * South-bound Latitude: -61.123300 * West-bound Longitude: 139.230000 * North-bound Latitude: -60.900700 * East-bound Longitude: 140.645700
Date/Time Start: 1999-02-09T13:13:00 * Date/Time End: 1999-02-22T08:21:00
Minimum DEPTH, water: 40 m * Maximum DEPTH, water: 40 m
Event(s):
T1136-1 * Latitude: -60.978500 * Longitude: 139.230000 * Date/Time: 1999-02-09T13:13:00 * Location: Southern Ocean - Australasian-Pacific Sector * Campaign: SOIREE * Basis: Tangaroa * Device: Go-Flo bottles (GOFLO) * Comment: OUT-patch of the iron-fertilized area
T1139-1 * Latitude: -60.987000 * Longitude: 139.463300 * Date/Time: 1999-02-10T17:48:00 * Location: Southern Ocean - Australasian-Pacific Sector * Campaign: SOIREE * Basis: Tangaroa * Device: Go-Flo bottles (GOFLO) * Comment: IN-patch of the iron-fertilized area
T1140-6 * Latitude: -60.945800 * Longitude: 139.728200 * Date/Time: 1999-02-12T07:32:00 * Location: Southern Ocean - Australasian-Pacific Sector * Campaign: SOIREE * Basis: Tangaroa * Device: Go-Flo bottles (GOFLO) * Comment: IN-patch of the iron-fertilized area
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2CommentCommentIn/Out patch
3Date/Time of eventDate/Time
4Latitude of eventLatitude
5Longitude of eventLongitude
6DEPTH, waterDepth watermGeocode
7Iron-binding ligand, dissolvedFeL dissnmol/lCroot, Peter L
8ErrorErrorCroot, Peter LVoltammetryIron-binding ligand
9Iron, dissolved, conditional complex stabilityFe LogK´ dissCroot, Peter LVoltammetryK is relative to Fe' where aFe' is 10**10
10ErrorErrorCroot, Peter LVoltammetryLog K
11Iron, dissolvedFe dissnmol/lCroot, Peter LVoltammetry
Size:
64 data points

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