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  • 1990-1994  (18)
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Keywords
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Years
Year
  • 1
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    Scavenging and particle flux: seasonal and regional variations in the Southern Ocean (Atlantic sector) (1991)
    Elsevier
    Details
    Publication Date: 1991-11-01
    Print ISSN: 0304-4203
    Electronic ISSN: 1872-7581
    Topics: Geosciences
    Published by Elsevier
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    PAPER CURRENT
  • 2
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    Lead and aluminum in Atlantic surface waters (50°N to 50°S) reflecting anthropogenic and natural sources in the Eolian transport (1993)
    American Geophysical Union
    Details
    Publication Date: 1993-01-01
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
    Published by American Geophysical Union
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    PAPER CURRENT
  • 3
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    Scavenging of 230Th and 231Pa near the antarctic polar front in the South Atlantic (1993)
    Elsevier
    Details
    Publication Date: 1993-02-01
    Print ISSN: 0967-0637
    Electronic ISSN: 1879-0119
    Topics: Biology , Geosciences , Physics
    Published by Elsevier
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    PAPER CURRENT
  • 4
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    Radionuclides in the water column at stations near the Antarctic Polar Front in the South Atlantic (1993)
    PANGAEA
    In:  Supplement to: Rutgers van der Loeff, Michiel M; Berger, Gijs W (1993): Scavenging of 230Th and 231Pa near the antarctic polar front in the South Atlantic. Deep Sea Research Part I: Oceanographic Research Papers, 40(2), 339-357, https://doi.org/10.1016/0967-0637(93)90007-P
    Details
    Publication Date: 2024-06-25
    Description: Vertical profiles of dissolved and particulate 230Th and 231Pa were obtained across the Antarctic Circumpolar Current (ACC) in the southern Atlantic. North of the Polar Front, dissolved and total 230Th increase with depth in conformity with published scavenging models. There is no depletion of 230Th or 231Pa in the water column south of the Polar Front, thought to be an area of enhanced biological productivity. 230Th concentrations increase three-fold to the Weddell Sea across the ACC. Dissolved and total 231Pa concentrations are relatively constant below 500 m depth at about 0.3 dpm m**-3, and change little with depth or latitude. The results from the Weddell Gyre are explained by a mixing-scavenging model that takes into account the input of lower Circumpolar Deep Water through upwelling, which is the main source of water in the Weddell Gyre and is enriched in 230Th but not in 231Pa. 230Th accumulates in the Weddell Gyre as a result of a reduction in the scavenging rate and by ingrowth from 234U. Ingrowth is more significant for 230Th than for 231Pa because the residence time of water in the gyre (about 35 years) is similar to the scavenging residence time of Th in the south Atlantic (29 years) but shorter than that of Pa (120 years). It is argued that changes in 230Th accumulation in the past may reflect changes in water residence time and in the formation rate of Weddell Sea Deep Water.
    Keywords: Agulhas Basin; ANT-IX/3; ANT-VIII/3; Atlantic Ridge; AWI_MarGeoChem; AWI_Paleo; Marine Geochemistry @ AWI; Maud Rise; Meteor Rise; MULT; Multiple investigations; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS16; PS16/267; PS16/281; PS16/294; PS16/311; PS16/321; PS16/342; PS16/362; PS16/370; PS1751-8; PS1755-2; PS1759-5; PS1768-2; PS1772-2; PS1777-8; PS1782-7; PS1785-1; PS18; PS18/227; PS2072; Shona Ridge; South Sandwich Basin; South Sandwich Trough; Water sample; WS
    Type: Dataset
    Format: application/zip, 9 datasets
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    DATA PANGAEA
  • 5
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    Radionuclides in the Weddell Sea (1994)
    PANGAEA
    In:  Supplement to: Rutgers van der Loeff, Michiel M (1994): 228Ra and 228Th in the Weddell Sea. In: Johannessen, O M; Muench, R D & Overland, J E (eds.), The polar oceans and their role in shaping the global environment. Geophysical Monograph Series, American Geophysical Union, 540 pages, ISBN 0-87590-042-9, 85, 177-186
    Details
    Publication Date: 2024-06-25
    Description: 228Ra and its granddaughter 228Th were measured on a N-S transect from 45's to the Antarctic continent across the Antarctic Circumpolar Current (ACC) and the Weddell Sea. The distributions of 230Th, 228Th and 228Ra show that southward transport across the ACC of Circumpolar Deep Water (CDW), the source of Warm Deep Water (WDW) in the Weddell Sea, occurs on a time scale between 8 and 30 years, in qualitative agreement with estimates of the upwelling rate of WDW. The distribution of 228Ra in deep waters is controlled by advection and isopycnal mixing rather than diapycnal mixing. In the Weddell Sea, deep-water 228Ra activities reach 15-20 dpm/m**3. Enrichment in deep water is controlled by the production in the deep-sea floor, favoured by low biogenic sediment accumulation rates and consequently high 232Th contents in the surface sediment (3 to 5 dpm/g). The highest 228Ra value (73 dpm/m**3) was observed near the sea floor in a channel where an eastern outflow of Weddell Sea Bottom Water (WSBW) is suspected. It is not yet known whether this value is produced in-situ by accumulation in the stratified bottom water, or contains a Signal of enrichment in shelf- and Ice Shelf Water. High 228Ra activities on the south-eastem shelf (22 dpm/m**3) and low activities offshore yield an estimated residente time of 1.5 years on this shelf and imply slow exchange with offshore waters.
    Keywords: Agulhas Basin; ANT-IX/3; ANT-VIII/3; ANT-X/6; Atlantic Ridge; AWI_MarGeoChem; AWI_Paleo; DIVERSE; Filchner Trough; Halley Bay; Lazarev Sea; Marine Geochemistry @ AWI; Maud Rise; Meteor Rise; MULT; Multiple investigations; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS16; PS16/267; PS16/281; PS16/294; PS16/311; PS16/321; PS16/342; PS16/362; PS16/370; PS1751-8; PS1755-2; PS1759-5; PS1768-2; PS1772-2; PS1777-8; PS1782-7; PS1785-1; PS18; PS18/126; PS18/127; PS18/141; PS18/153; PS18/163; PS18/196; PS18/199; PS18/200; PS18/202; PS18/227; PS1999; PS2011; PS2049; PS2051; PS2052; PS2054; PS2072; PS22; PS22/862; PS22/865; PS22/866; PS22/908; PS22/911; PS22/917; Sampling gear, diverse; Shona Ridge; South Atlantic Ocean; South Sandwich Basin; South Sandwich Trough; Water sample; Weddell Sea; WS
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 6
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    Lead and aluminum in Atlantic surface water measured along the track of POLARSTERN cruise ANT-VIII/7 and ANT-IX/1 (Tables 2, 3) (1993)
    PANGAEA
    In:  Supplement to: Helmers, Eckard; Rutgers van der Loeff, Michiel M (1993): Lead and aluminum in Atlantic surface water (50°N to 50°S) reflecting anthropogenic and natural sources in the eolian transport. Journal of Geophysical Research: Oceans, 98(C11), 20261-20273, https://doi.org/10.1029/93JC01623
    Details
    Publication Date: 2024-06-25
    Description: Lead and aluminum were measured with a 40–100 km resolution in surface water on two transects across the Atlantic Ocean, one in May 1990 from Cape Town to the North Sea, the other in November 1990 from the North Sea to the Strait of Magellan. Samples were drawn 14 m below surface at normal speed from a 2-m-long snorkel system mounted on the bottom of the ship directly into a clean-room area. In the tropics, both Pb and Al show maximum oncentrations in the Intertropical Convergence Zone (ITCZ) correlated with each other and with minimum salinities, indicating wet deposition as their common source. Even in this area characterized by large inputs of mineral aerosols, the Pb/Al ratio shows that the major source of soluble lead (〉95%) is anthropogenic. At higher latitudes, Al is low throughout (10–20 nmol/kg), whereas enhanced Pb values show the anthropogenic inputs off south Africa, northern Argentina and especially western Europe. Very low Pb and especially Al concentrations in the upwelling areas associated with the Canary and Benguela currents show that the enhanced biogenic particle fluxes cause an efficient scavenging of both lithogenic particles known to arrive here by dry deposition, and of the adhering reactive trace metals.
    Keywords: Al, Lumogallion (Mackin & Aller, 1984); Aluminium; ANT-IX/1; ANT-IX/1_100; ANT-IX/1_101; ANT-IX/1_102; ANT-IX/1_103; ANT-IX/1_104; ANT-IX/1_105; ANT-IX/1_106; ANT-IX/1_107; ANT-IX/1_108; ANT-IX/1_109; ANT-IX/1_110; ANT-IX/1_111; ANT-IX/1_112; ANT-IX/1_113; ANT-IX/1_114; ANT-IX/1_115; ANT-IX/1_116; ANT-IX/1_117; ANT-IX/1_118; ANT-IX/1_119; ANT-IX/1_120; ANT-IX/1_121; ANT-IX/1_122; ANT-IX/1_123; ANT-IX/1_124; ANT-IX/1_125; ANT-IX/1_126; ANT-IX/1_127; ANT-IX/1_128; ANT-IX/1_129; ANT-IX/1_130; ANT-IX/1_131; ANT-IX/1_132; ANT-IX/1_133; ANT-IX/1_134; ANT-IX/1_135; ANT-IX/1_136; ANT-IX/1_137; ANT-IX/1_138; ANT-IX/1_139; ANT-IX/1_140; ANT-IX/1_141; ANT-IX/1_142; ANT-IX/1_143; ANT-IX/1_144; ANT-IX/1_145; ANT-IX/1_146; ANT-IX/1_147; ANT-IX/1_148; ANT-IX/1_149; ANT-IX/1_150; ANT-IX/1_151; ANT-IX/1_152; ANT-IX/1_153; ANT-IX/1_154; ANT-IX/1_155; ANT-IX/1_156; ANT-IX/1_157; ANT-IX/1_158; ANT-IX/1_159; ANT-IX/1_160; ANT-IX/1_161; ANT-IX/1_162; ANT-IX/1_163; ANT-IX/1_164; ANT-IX/1_165; ANT-IX/1_166; ANT-IX/1_167; ANT-IX/1_168; ANT-IX/1_169; ANT-IX/1_170; ANT-IX/1_171; ANT-IX/1_172; ANT-IX/1_173; ANT-IX/1_174; ANT-IX/1_175; ANT-IX/1_176; ANT-IX/1_177; ANT-IX/1_178; ANT-IX/1_179; ANT-IX/1_180; ANT-IX/1_181; ANT-IX/1_182; ANT-IX/1_183; ANT-IX/1_184; ANT-IX/1_185; ANT-IX/1_186; ANT-IX/1_187; ANT-IX/1_188; ANT-IX/1_189; ANT-IX/1_190; ANT-IX/1_191; ANT-IX/1_192; ANT-IX/1_193; ANT-IX/1_194; ANT-IX/1_195; ANT-IX/1_196; ANT-IX/1_197; ANT-IX/1_198; ANT-IX/1_199; ANT-IX/1_200; ANT-IX/1_201; ANT-IX/1_202; ANT-IX/1_203; ANT-IX/1_204; ANT-IX/1_205; ANT-IX/1_206; ANT-IX/1_207; ANT-IX/1_208; ANT-IX/1_209; ANT-IX/1_210; ANT-IX/1_211; ANT-IX/1_212; ANT-IX/1_213; ANT-IX/1_214; ANT-IX/1_215; ANT-IX/1_216; ANT-IX/1_217; ANT-IX/1_218; ANT-IX/1_219; ANT-IX/1_220; ANT-IX/1_221; ANT-IX/1_222; ANT-IX/1_223; ANT-IX/1_224; ANT-IX/1_225; ANT-IX/1_226; ANT-IX/1_227; ANT-IX/1_228; ANT-VIII/7; ANT-VIII/7_1; ANT-VIII/7_10; ANT-VIII/7_11; ANT-VIII/7_12; ANT-VIII/7_13; ANT-VIII/7_14; ANT-VIII/7_15; ANT-VIII/7_16; ANT-VIII/7_17; ANT-VIII/7_18; ANT-VIII/7_19; ANT-VIII/7_2; ANT-VIII/7_20; ANT-VIII/7_21; ANT-VIII/7_22; ANT-VIII/7_23; ANT-VIII/7_24; ANT-VIII/7_25; ANT-VIII/7_26; ANT-VIII/7_27; ANT-VIII/7_28; ANT-VIII/7_29; ANT-VIII/7_3; ANT-VIII/7_30; ANT-VIII/7_31; ANT-VIII/7_32; ANT-VIII/7_33; ANT-VIII/7_34; ANT-VIII/7_35; ANT-VIII/7_36; ANT-VIII/7_37; ANT-VIII/7_38; ANT-VIII/7_39; ANT-VIII/7_4; ANT-VIII/7_40; ANT-VIII/7_41; ANT-VIII/7_42; ANT-VIII/7_43; ANT-VIII/7_44; ANT-VIII/7_45; ANT-VIII/7_46; ANT-VIII/7_47; ANT-VIII/7_48; ANT-VIII/7_49; ANT-VIII/7_5; ANT-VIII/7_50; ANT-VIII/7_51; ANT-VIII/7_52; ANT-VIII/7_53; ANT-VIII/7_54; ANT-VIII/7_55; ANT-VIII/7_56; ANT-VIII/7_57; ANT-VIII/7_58; ANT-VIII/7_59; ANT-VIII/7_6; ANT-VIII/7_60; ANT-VIII/7_61; ANT-VIII/7_62; ANT-VIII/7_63; ANT-VIII/7_64; ANT-VIII/7_65; ANT-VIII/7_66; ANT-VIII/7_67; ANT-VIII/7_68; ANT-VIII/7_69; ANT-VIII/7_7; ANT-VIII/7_70; ANT-VIII/7_71; ANT-VIII/7_72; ANT-VIII/7_73; ANT-VIII/7_74; ANT-VIII/7_75; ANT-VIII/7_76; ANT-VIII/7_77; ANT-VIII/7_78; ANT-VIII/7_79; ANT-VIII/7_8; ANT-VIII/7_80; ANT-VIII/7_81; ANT-VIII/7_82; ANT-VIII/7_83; ANT-VIII/7_84; ANT-VIII/7_85; ANT-VIII/7_86; ANT-VIII/7_87; ANT-VIII/7_88; ANT-VIII/7_89; ANT-VIII/7_9; ANT-VIII/7_90; ANT-VIII/7_91; ANT-VIII/7_92; ANT-VIII/7_93; AWI_MarGeoChem; AWI_Paleo; Barcelona Coast; Canarias Sea; Celtic Sea; Date/Time of event; DEPTH, water; Differential pulse anodic stripping voltammetry; Event label; Guadiana Estuary; Latitude of event; Lead; Lead, standard deviation; Longitude of event; Marine Geochemistry @ AWI; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Pertuis Charentais; Polarstern; PS16; PS18; Salinity; SNORKEL; Snorkel with pump; South Atlantic Ocean
    Type: Dataset
    Format: text/tab-separated-values, 886 data points
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  • 7
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    (Table 1) Radionuclides in the water column at station PS1751-8 (1993)
    PANGAEA
    Details
    Publication Date: 2024-06-25
    Keywords: Agulhas Basin; Alpha spectrometry; ANT-VIII/3; AWI_MarGeoChem; AWI_Paleo; CTD; Density, sigma-theta (0); DEPTH, water; Fractionation factor; Fractionation factor, error; Marine Geochemistry @ AWI; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; Protactinium-231, dissolved; Protactinium-231, dissolved, standard deviation; Protactinium-231, particulate; Protactinium-231, particulate standard deviation; PS16; PS16/267; PS1751-8; Salinity; Temperature, water, potential; Thorium-230, dissolved; Thorium-230, dissolved, standard deviation; Thorium-230, particulate; Thorium-230, particulate, standard deviation; Water sample; WS
    Type: Dataset
    Format: text/tab-separated-values, 59 data points
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  • 8
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    (Table 1) Radionuclides in the water column at station PS1755-2 (1993)
    PANGAEA
    Details
    Publication Date: 2024-06-25
    Keywords: Alpha spectrometry; ANT-VIII/3; AWI_MarGeoChem; AWI_Paleo; CTD; Density, sigma-theta (0); DEPTH, water; Fractionation factor; Fractionation factor, error; Marine Geochemistry @ AWI; Meteor Rise; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; Protactinium-231, dissolved; Protactinium-231, dissolved, standard deviation; Protactinium-231, particulate; Protactinium-231, particulate standard deviation; PS16; PS16/281; PS1755-2; Salinity; Temperature, water, potential; Thorium-230, dissolved; Thorium-230, dissolved, standard deviation; Thorium-230, particulate; Thorium-230, particulate, standard deviation; Water sample; WS
    Type: Dataset
    Format: text/tab-separated-values, 59 data points
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  • 9
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    (Table 1) Radionuclides in the water column at station PS1772-2 (1993)
    PANGAEA
    Details
    Publication Date: 2024-06-25
    Keywords: Alpha spectrometry; ANT-VIII/3; Atlantic Ridge; AWI_MarGeoChem; AWI_Paleo; CTD; Density, sigma-theta (0); DEPTH, water; Fractionation factor; Fractionation factor, error; Marine Geochemistry @ AWI; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; Protactinium-231, dissolved; Protactinium-231, dissolved, standard deviation; Protactinium-231, particulate; Protactinium-231, particulate standard deviation; PS16; PS16/321; PS1772-2; Salinity; Temperature, water, potential; Thorium-230, dissolved; Thorium-230, dissolved, standard deviation; Thorium-230, particulate; Thorium-230, particulate, standard deviation; Water sample; WS
    Type: Dataset
    Format: text/tab-separated-values, 59 data points
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  • 10
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    (Table 1) Radionuclides in the water column at station PS1759-5 (1993)
    PANGAEA
    Details
    Publication Date: 2024-06-25
    Keywords: Alpha spectrometry; ANT-VIII/3; AWI_MarGeoChem; AWI_Paleo; CTD; Density, sigma-theta (0); DEPTH, water; Fractionation factor; Fractionation factor, error; Marine Geochemistry @ AWI; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; Protactinium-231, dissolved; Protactinium-231, dissolved, standard deviation; Protactinium-231, particulate; Protactinium-231, particulate standard deviation; PS16; PS16/294; PS1759-5; Salinity; Shona Ridge; Temperature, water, potential; Thorium-230, dissolved; Thorium-230, dissolved, standard deviation; Thorium-230, particulate; Thorium-230, particulate, standard deviation; Water sample; WS
    Type: Dataset
    Format: text/tab-separated-values, 59 data points
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