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Hayes, Christopher T; Anderson, Robert F; Jaccard, Samuel L; Francois, Roger; Fleisher, Martin Q; Soon, Maureen; Gersonde, Rainer (2013): Radionuclides measured on water bottle samples during SONNE cruise SO202 (INOPEX) [dataset]. PANGAEA,, Supplement to: Hayes, CT et al. (2013): A new perspective on boundary scavenging in the North Pacific Ocean. Earth and Planetary Science Letters, 369-370, 86-97,

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Boundary scavenging, or the enhanced removal of adsorption-prone elements from the ocean in areas of high particle flux, is an often cited, though not well-quantified, concept used to understand the oceanic distribution of many trace metals. Because 230Th and 231Pa are produced uniformly from uranium decay and removed differentially by scavenging, the process of boundary scavenging can be elucidated by a more detailed knowledge of their water column distributions. To this end, filtered seawater was collected across the gradients in particle flux which span the subarctic Pacific: in the west during the Innovative North Pacific Experiment (INOPEX) and in the east along Line P. Lateral concentration gradients of dissolved 230Th are small throughout the subarctic Pacific at 12 sites of variable particle flux. This contradicts the prediction of the traditional boundary scavenging model. A compilation of water column data from throughout the North Pacific reveals much larger lateral concentration gradients for 230Th between the subarctic North Pacific and subtropical gyre, over lateral gradients in scavenging intensity similar to those found within the subarctic. This reflects a biogeochemical-province aspect to scavenging. Upper water column distributions of 231Pa and 231Pa/230Th ratio are consistent with the influence of scavenging by biogenic opal, while deep waters (>2.5 km) reveal an additional 231Pa sink possibly related to manganese oxides produced at continental margins or ridge crests.
Further details:
Anderson, Robert F; Fleisher, Martin Q; Hayes, Christopher T (2013): DATASET description of dissolved 232Th, 230Th, and 231Pa during SONNE cruise SO202. hdl:10013/epic.41518.d001
Median Latitude: 43.659743 * Median Longitude: 174.722114 * South-bound Latitude: 38.011400 * West-bound Longitude: 152.348700 * North-bound Latitude: 53.002200 * East-bound Longitude: -157.193000
Date/Time Start: 2009-07-15T16:03:00 * Date/Time End: 2009-08-22T08:07:00
Minimum DEPTH, water: 12 m * Maximum DEPTH, water: 5482 m
SO202/1_05-5 * Latitude: 52.696400 * Longitude: 164.919400 * Date/Time: 2009-07-15T16:03:00 * Elevation: -3364.0 m * Location: North Pacific Ocean * Campaign: SO202/1 (INOPEX) * Basis: Sonne * Method/Device: CTD/Rosette (CTD-RO)
SO202/1_24-1 * Latitude: 53.002200 * Longitude: -157.193000 * Date/Time: 2009-07-30T19:22:00 * Elevation: -4567.0 m * Location: North Pacific Ocean * Campaign: SO202/1 (INOPEX) * Basis: Sonne * Method/Device: CTD/Rosette (CTD-RO)
SO202/1_32-1 * Latitude: 45.502200 * Longitude: -158.498600 * Date/Time: 2009-08-07T00:51:00 * Elevation: -5302.0 m * Location: North Pacific Ocean * Campaign: SO202/1 (INOPEX) * Basis: Sonne * Method/Device: CTD/Rosette (CTD-RO)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Date/Time of eventDate/Time
3Latitude of eventLatitude
4Longitude of eventLongitude
5Elevation of eventElevationm
6DEPTH, waterDepth watermGeocode
7Pressure, waterPressdbarAnderson, Robert FCTD, Sea-Bird
8Temperature, waterTemp°CAnderson, Robert FCTD, Sea-BirdITS-90
9SalinitySalAnderson, Robert FCTD, Sea-BirdPSS-78
10OxygenO2µmol/lAnderson, Robert FCTD, Sea-Bird
11DateDateAnderson, Robert FU separated from Th/Pa
12Thorium-232, dissolved232Th disspg/kgAnderson, Robert Fsee further details
13Thorium-232, dissolved, standard deviation232Th diss std dev±Anderson, Robert Fsee further details1 sigma
14Thorium-230, dissolved230Th dissfg/kgAnderson, Robert Fsee further details
15Thorium-230, dissolved, standard deviation230Th diss std dev±Anderson, Robert Fsee further details1 sigma
16Protactinium-231, dissolved231Pa dissfg/kgAnderson, Robert Fsee further details
17Protactinium-231, dissolved, standard deviation231Pa diss std dev±Anderson, Robert Fsee further details1 sigma
1043 data points

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