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Walter, Hans-Jürgen; Rutgers van der Loeff, Michiel M (2001): (Table 2) Annual mass fluxes, 230Th composition and organic geochemistry of sediment trap samples in the South Altantic. doi:10.1594/PANGAEA.57910,
Supplement to: Walter, Hans-Jürgen; Geibert, Walter; Rutgers van der Loeff, Michiel M; Fischer, Gerhard; Bathmann, Ulrich (2001): Shallow vs. deep-water scavenging of 231Pa and 230Th in radionuclide enriched waters of the Atlantic sector of the Southern Ocean. Deep Sea Research Part I: Oceanographic Research Papers, 48(2), 471-493, doi:10.1016/S0967-0637(00)00046-7

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Abstract:
The scavenging of 231Pa and 230Th was investigated in the Atlantic Sector of the Southern Ocean by combining results from sediment trap and in situ filtration studies. We present the first high-resolution profile of dissolved 230Th and 231Pa in surface waters across the ACC, showing a dramatic southward increase of both radionuclides around the southern ACC Front at 533S. High dissolved 231Pa/230Th ratios combined with low 230Th/231Pa fractionation factors (F) in these surface waters result in extremely high 231Pa94/230Th94 ratios of material collected in the shallow traps. Particulate 231Pa94/230Th94 ratios in a shallow trap near Bouvet Island increase continuously during the productive period in austral summer, and drop back in the low flux period. This behavior, following the Rayleigh fractionation principle, is interpreted to be due to an increase in the dissolved 231Pa/230Th ratio in the euphotic zone resulting from preferential scavenging of 230Th relative to 231Pa, even in opal-dominated regions. In the post-bloom stage, the depleted radionuclide concentrations are replenished by upwelling of Circumpolar Deep Water. The high particulate 231Pa94/230Th94 signal is weakened during downward transport of the bloom particles in the water column by incorporation of deep suspended particles, which have a lower 231Pa94/230Th94 ratio. It is shown that under the special hydrographic conditions in the Southern Ocean scavenging from the upper water column significantly influences the budgets of 230Th and 231Pa in the sediment. Nevertheless, the budgets are still made up primarily by scavenging from the large standing stock of deep suspended particles.
Project(s):
Silicon Cycling in the World Ocean (SINOPS)
Coverage:
Median Latitude: -57.406300 * Median Longitude: -9.280370 * South-bound Latitude: -65.605000 * West-bound Longitude: -57.528333 * North-bound Latitude: -50.126667 * East-bound Longitude: 5.833333
Date/Time Start: 1983-12-01T00:00:00 * Date/Time End: 1992-05-15T00:00:00
Minimum DEPTH, water: 360 m * Maximum DEPTH, water: 3700 m
Event(s):
AWI208 * Latitude: -65.605000 * Longitude: -36.498300 * Date/Time Start: 1989-09-24T22:00:00 * Date/Time End: 1990-11-29T12:00:00 * Elevation: -4742.0 m * Location: Weddell Sea * Campaign: ANT-VIII/2 (PS16 06AQANTVIII_2) * Basis: Polarstern * Device: Mooring (long time) (MOORY)
AWI400/0 * Latitude: -57.300000 * Longitude: 4.116667 * Elevation: -4467.0 m * Device: Trap (TRAP)
AWI400/1 (PS18/228) * Latitude: -57.626700 * Longitude: 4.053300 * Date/Time: 1991-03-21T00:00:00 * Campaign: ANT-IX/3 (PS18) * Basis: Polarstern * Device: Trap (TRAP)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Latitude of eventLatitude
2Longitude of eventLongitude
3Event labelEvent
4DEPTH, waterDepth watermGeocode
5DATE/TIMEDate/TimeGeocode
6Date/time endDate/time endRutgers van der Loeff, Michiel M
7Duration, number of daysDurationdaysRutgers van der Loeff, Michiel M
8Total flux per yearAnn mass fluxg/m2/aRutgers van der Loeff, Michiel M
9Opal, biogenic silicabSiO2%Rutgers van der Loeff, Michiel M
10Carbon, organic, totalTOC%Rutgers van der Loeff, Michiel MElement analyser CHN
11Calcium carbonateCaCO3%Rutgers van der Loeff, Michiel MElement analyser CHN
12Organic matter, particulatePOM%Rutgers van der Loeff, Michiel M
13TerrigeneousTerr%Rutgers van der Loeff, Michiel M
14Thorium 230 excess230Th xsdpm/gRutgers van der Loeff, Michiel MAlpha-spectrometry
15Thorium 230 excess, standard deviation230Th xs std dev±Rutgers van der Loeff, Michiel MAlpha-spectrometry
16Thorium fluxTh fluxdpm/m2/aRutgers van der Loeff, Michiel MAlpha-spectrometry
17Thorium flux, standard deviationTh flux std dev±Rutgers van der Loeff, Michiel MAlpha-spectrometry
18Protactinium 231 excess231Pa xsdpm/gRutgers van der Loeff, Michiel MAlpha-spectrometry
19Protactinium 231 excess, standard deviation231Pa xs std dev±Rutgers van der Loeff, Michiel MAlpha-spectrometry
20Protactinium 231 fluxFa(Pa)dpm/m2/aRutgers van der Loeff, Michiel MAlpha-spectrometry
21Protactinium 231 flux, standard deviationFa(Pa) std dev±Rutgers van der Loeff, Michiel MAlpha-spectrometry
22Protactinium 231/Thorium 230 excess231Pa/230Th xsRutgers van der Loeff, Michiel MCalculated
23Protactinium 231/Thorium 230 excess, standard deviation231Pa/230Th xs std dev±Rutgers van der Loeff, Michiel M
24CommentCommentRutgers van der Loeff, Michiel M
Size:
231 data points

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