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  • PANGAEA  (7)
  • Elsevier  (6)
  • Public Library of Science
  • 2010-2014  (13)
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  • 1
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    Factors controlling the silicon isotope distribution in waters and surface sediments of the Peruvian coastal upwelling (2012)
    Elsevier
    Details
    Publikationsdatum: 2012-12-01
    Print ISSN: 0016-7037
    Digitale ISSN: 1872-9533
    Thema: Chemie und Pharmazie , Geologie und Paläontologie
    Publiziert von Elsevier
    Standort Signatur Erwartet Verfügbarkeit
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    AKTUELLE ARTIKEL
  • 2
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    The distribution of neodymium isotopes and concentrations in the Eastern Equatorial Pacific: Water mass advection versus particle exchange (2012)
    Elsevier
    Details
    Publikationsdatum: 2012-11-01
    Print ISSN: 0012-821X
    Digitale ISSN: 1385-013X
    Thema: Geologie und Paläontologie , Physik
    Publiziert von Elsevier
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    Ocean oxygen minima expansions and their biological impacts (2010)
    Elsevier
    Details
    Publikationsdatum: 2010-04-01
    Print ISSN: 0967-0637
    Digitale ISSN: 1879-0119
    Thema: Biologie , Geologie und Paläontologie , Physik
    Publiziert von Elsevier
    Standort Signatur Erwartet Verfügbarkeit
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    AKTUELLE ARTIKEL
  • 4
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    The distribution of neodymium isotopes and concentrations in the Eastern Equatorial Pacific: Water mass advection versus particle exchange (2012)
    Elsevier
    In:  Earth and Planetary Science Letters, 353/354 . pp. 198-207.
    Details
    Publikationsdatum: 2019-09-23
    Beschreibung: The radiogenic isotope composition of the Rare Earth Element (REE) neodymium (Nd) is a powerful water mass proxy for present and past ocean circulation. The processes controlling the Nd budget of the global ocean are not quantitatively understood and in particular source and sink mechanisms are still under debate. In this study we present the first full water column data set of dissolved Nd isotope compositions and Nd concentrations for the Eastern Equatorial Pacific (EEP), where one of the globally largest Oxygen Minimum Zones (OMZ) is located. This region is of particular interest for understanding the biogeochemical cycling of REEs because anoxic conditions may lead to release of REEs from the shelf, whereas high particle densities and fluxes potentially remove the REEs from the water column. Data were obtained between 1°40′N and 16°S along a nearshore and an offshore transect. Near surface zonal current bands, such as the Equatorial Undercurrent (EUC) and the Subsurface Countercurrent (SSCC), which are supplying oxygen-rich water to the OMZ are characterized by radiogenic Nd isotope signatures (εNd=−2). Surface waters in the northernmost part of the study area are even more radiogenic (εNd=+3), most likely due to release of Nd from volcanogenic material. Deep and bottom waters at the southernmost offshore station (14°S) are clearly controlled by advection of water masses with less radiogenic signatures (εNd=−7) originating from the Southern Ocean. Towards the equator, however, the deep waters show a clear trend towards more radiogenic values of up to εNd=−2. The northernmost station located in the Panama basin shows highly radiogenic Nd isotope signatures in the entire water column, which indicates that particle scavenging, downward transport and release processes play an important role. This is supported by relatively low Nd concentrations in deep waters (3000–6000 m) in the EEP (20 pmol/kg) compared to locations in the Northern and Central Pacific (40–60 pmol/kg), which suggests enhanced removal of Nd in the EEP.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    ARTIKEL (OCEANREP)
  • 5
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    Factors controlling the silicon isotope distribution in waters and surface sediments of the Peruvian coastal upwelling (2012)
    Elsevier
    In:  Geochimica et Cosmochimica Acta, 99 . pp. 128-145.
    Details
    Publikationsdatum: 2019-09-23
    Beschreibung: We present the first systematic study of the silicon isotope composition in the water column (δ30SiSi(OH)4) and in diatoms (δ30Sidiatom) from the underlying surface sediments in a coastal upwelling region. The surface waters upwelling on the shelf off Peru are mainly fed by southward flowing subsurface waters along the coast, which show a mean δ30SiSi(OH)4 of +1.5‰. The concentration of dissolved silicic acid (Si(OH)4) increases towards the south in these waters and with increasing water depth, suggesting lateral mixing with water masses from the south and intense remineralisation of particulate biogenic silica (bSiO2) in the water column and in the surface sediments. Surface waters in the realm of the most intense upwelling between 5°S and 15°S have only marginally elevated δ30SiSi(OH)4 values (δ30SiSi(OH)4 = +1.7‰) with respect to the source Si isotope composition, whereas further north and south, where upwelling is less pronounced, surface waters are more strongly fractionated (δ30SiSi(OH)4 up to +2.8‰) due to the stronger utilisation of the smaller amounts of available Si(OH)4. The degree of Si(OH)4 utilisation in the surface waters along the shelf estimated from the Si(OH)4 concentration data ranges from 51% to 93%. The δ30Sidiatom values of hand-picked diatoms in the underlying surface sediments vary from +0.6‰ to +2.0‰, which is within the range of the expected fractionation between surface waters and diatoms. The fractionation signal in the surface waters produced during formation of the diatoms is reflected by the δ30Sidiatom values in the underlying sediments, with the lowest δ30Sidiatom values in the main upwelling region. The silicon isotope compositions of bSiO2 (δ30SibSiO2) from the same surface sediment samples are generally much lower than the δ30Sidiatom signatures indicating a significant contamination of the bSiO2 with biogenic siliceous material other than diatoms, such as sponge spicules. This shift towards lighter δ30SibSiO2 values by up to −1.3‰ compared to δ30Sidiatom signatures for the same surface sediment samples potentially biases the interpretation of δ30Si paleorecords from sediments with low bSiO2 concentrations, and thus the reconstruction of past Si(OH)4 utilisation in surface waters.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    ARTIKEL (OCEANREP)
  • 6
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    Ocean oxygen minima expansions and their biological impacts (2010)
    Elsevier
    In:  Deep Sea Research Part I: Oceanographic Research Papers, 57 . pp. 587-595.
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: Climate models with biogeochemical components predict declines in oceanic dissolved oxygen with global warming. In coastal regimes oxygen deficits represent acute ecosystem perturbations. Here, we estimate dissolved oxygen differences across the global tropical and subtropical oceans within the oxygen minimum zone (200–700-dbar depth) between 1960–1974 (an early period with reliable data) and 1990–2008 (a recent period capturing ocean response to planetary warming). In most regions of the tropical Pacific, Atlantic, and Indian Oceans the oxygen content in the 200–700-dbar layer has declined. Furthermore, at 200 dbar, the area with O2 〈70 μmol kg−1, where some large mobile macro-organisms are unable to abide, has increased by 4.5 million km2. The tropical low oxygen zones have expanded horizontally and vertically. Subsurface oxygen has decreased adjacent to most continental shelves. However, oxygen has increased in some regions in the subtropical gyres at the depths analyzed. According to literature discussed below, fishing pressure is strong in the open ocean, which may make it difficult to isolate the impact of declining oxygen on fisheries. At shallower depths we predict habitat compression will occur for hypoxia-intolerant taxa, with eventual loss of biodiversity. Should past trends in observed oxygen differences continue into the future, shifts in animal distributions and changes in ecosystem structure could accelerate.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    ARTIKEL (OCEANREP)
  • 7
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    Distribution of neodymium isotopes and concentrations during M77/3 and M77/4 (2013)
    PANGAEA
    In:  Supplement to: Grasse, Patricia; Stichel, Torben; Stumpf, Roland; Stramma, Lothar; Frank, Martin (2012): The distribution of neodymium isotopes and concentrations in the Eastern Equatorial Pacific Water mass advection versus particle exchange. Earth and Planetary Science Letters, 198-207, https://doi.org/10.1016/j.epsl.2012.07.044
    Details
    Publikationsdatum: 2023-10-28
    Beschreibung: The radiogenic isotope composition of the Rare Earth Element (REE) neodymium (Nd) is a powerful water mass proxy for present and past ocean circulation. The processes controlling the Nd budget of the global ocean are not quantitatively understood and in particular source and sink mechanisms are still under debate. In this study we present the first full water column data set of dissolved Nd isotope compositions and Nd concentrations for the Eastern Equatorial Pacific (EEP), where one of the globally largest Oxygen Minimum Zones (OMZ) is located. This region is of particular interest for understanding the biogeochemical cycling of REEs because anoxic conditions may lead to release of REEs from the shelf, whereas high particle densities and fluxes potentially remove the REEs from the water column. Data were obtained between 11400N and 161S along a nearshore and an offshore transect. Near surface zonal current bands, such as the Equatorial Undercurrent (EUC) and the Subsurface Countercurrent (SSCC), which are supplying oxygen-rich water to the OMZ are characterized by radiogenic Nd isotope signatures (eNd=-2). Surface waters in the northernmost part of the study area are even more radiogenic (eNd = +3), most likely due to release of Nd from volcanogenic material. Deep and bottom waters at the southernmost offshore station (141S) are clearly controlled by advection of water masses with less radiogenic signatures (eNd=- 7) originating from the Southern Ocean. Towards the equator, however, the deep waters show a clear trend towards more radiogenic values of up to eNd=-2. The northernmost station located in the Panama basin shows highly radiogenic Nd isotope signatures in the entire water column, which indicates that particle scavenging, downward transport and release processes play an important role. This is supported by relatively low Nd concentrations in deep waters (3000-6000 m) in the EEP (20 pmol/kg) compared to locations in the Northern and Central Pacific (40-60 pmol/kg), which suggests enhanced removal of Nd in the EEP.
    Schlagwort(e): Climate - Biogeochemistry Interactions in the Tropical Ocean; SFB754
    Materialart: Dataset
    Format: application/zip, 2 datasets
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 8
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    Physical oceanography during METEOR cruise M68/2 (2012)
    PANGAEA
    In:  IFM-GEOMAR Leibniz-Institute of Marine Sciences, Kiel University
    Details
    Publikationsdatum: 2024-02-02
    Schlagwort(e): CTD; CTD/Rosette; CTD 1; CTD 10; CTD 100; CTD 101; CTD 102; CTD 103; CTD 104; CTD 105; CTD 106; CTD 107; CTD 108; CTD 109; CTD 11; CTD 110; CTD 111; CTD 112; CTD 113; CTD 115; CTD 12; CTD 13; CTD 14; CTD 15; CTD 16; CTD 17; CTD 18; CTD 19; CTD 2; CTD 20; CTD 21; CTD 22; CTD 23; CTD 24; CTD 25; CTD 26; CTD 27; CTD 28; CTD 29; CTD 3; CTD 30; CTD 31; CTD 32; CTD 33; CTD 34; CTD 35; CTD 36; CTD 37; CTD 38; CTD 39; CTD 4; CTD 40; CTD 41; CTD 42; CTD 43; CTD 44; CTD 45; CTD 46; CTD 47; CTD 48; CTD 49; CTD 5; CTD 50; CTD 51; CTD 52; CTD 53; CTD 54; CTD 55; CTD 56; CTD 57; CTD 58; CTD 59; CTD 6; CTD 60; CTD 61; CTD 62; CTD 63; CTD 64; CTD 65; CTD 66; CTD 67; CTD 68; CTD 69; CTD 7; CTD 70; CTD 71; CTD 72; CTD 73; CTD 74; CTD 75; CTD 76; CTD 77; CTD 78; CTD 79; CTD 8; CTD 80; CTD 81; CTD 82; CTD 83; CTD 84; CTD 85; CTD 86; CTD 87; CTD 88; CTD 89; CTD 9; CTD 90; CTD 91; CTD 92; CTD 93; CTD 94; CTD 95; CTD 96; CTD 97; CTD 98; CTD 99; CTD-RO; Date/Time of event; DEPTH, water; Elevation of event; Event label; Latitude of event; Longitude of event; M68/2; M68/2_130; M68/2_131; M68/2_132; M68/2_133; M68/2_134; M68/2_135; M68/2_136; M68/2_137; M68/2_138; M68/2_139; M68/2_140; M68/2_141; M68/2_142; M68/2_143; M68/2_144; M68/2_145; M68/2_147; M68/2_148; M68/2_149; M68/2_150; M68/2_151; M68/2_152; M68/2_153; M68/2_154; M68/2_155; M68/2_156; M68/2_157; M68/2_158; M68/2_159; M68/2_160; M68/2_163; M68/2_164; M68/2_170; M68/2_171; M68/2_172; M68/2_173; M68/2_174; M68/2_175; M68/2_176; M68/2_177; M68/2_178; M68/2_179; M68/2_181; M68/2_182; M68/2_183; M68/2_185; M68/2_186; M68/2_187; M68/2_189; M68/2_190; M68/2_192; M68/2_193; M68/2_194; M68/2_195; M68/2_196; M68/2_197; M68/2_198; M68/2_199; M68/2_200; M68/2_201; M68/2_202; M68/2_203; M68/2_204; M68/2_205; M68/2_206; M68/2_207; M68/2_208; M68/2_209; M68/2_210; M68/2_211; M68/2_212; M68/2_213; M68/2_214; M68/2_215; M68/2_216; M68/2_217; M68/2_218; M68/2_219; M68/2_220; M68/2_221; M68/2_222; M68/2_223; M68/2_224; M68/2_225; M68/2_226; M68/2_227; M68/2_228; M68/2_229; M68/2_230; M68/2_231; M68/2_232; M68/2_233; M68/2_234; M68/2_235; M68/2_236; M68/2_237; M68/2_238; M68/2_239; M68/2_240; M68/2_241; M68/2_242; M68/2_243; M68/2_244; M68/2_245; M68/2_246; M68/2_247; M68/2_248; M68/2_249; M68/2_250; M68/2_251; M68/2_252; M68/2_253; M68/2_254; M68/2_255; Meteor (1986); Oxygen; Pressure, water; Salinity; Temperature, water; Temperature, water, potential
    Materialart: Dataset
    Format: text/tab-separated-values, 862570 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 9
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    Distribution of neodymium isotopes and concentrations during METEOR cruise M77/4 (2013)
    PANGAEA
    Details
    Publikationsdatum: 2024-06-25
    Schlagwort(e): Climate - Biogeochemistry Interactions in the Tropical Ocean; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Device type; Event label; Latitude of event; Longitude of event; M77/4; M77/4_078; M77/4_140; M77/4_143; M77/4_152; M77/4_159; M77/4_160; M77/4-CTD18; M77/4-CTD19; M77/4-CTD29; M77/4-CTD3; M77/4-CTD35; M77/4-CTD36; M77/4-CTD4; M77/4-CTD42; M77/4-CTD44; M77/4-CTD45; M77/4-CTD47; M77/4-CTD54; M77/4-CTD63; M77/4-CTD64; M77/4-CTD70; M77/4-CTD73; M77/4-CTD82; M77/4-CTD89; M77/4-CTD90; Meteor (1986); Neodymium, dissolved; Neodymium, standard deviation; Nitrate; Nitrite; Nitrous oxide; Oxygen; Phosphate; Pressure, water; Quality flag; Salinity; Sample code/label; SFB754; Silicate; Temperature, water; ε-Neodymium
    Materialart: Dataset
    Format: text/tab-separated-values, 936 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 10
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    Distribution of neodymium isotopes and concentrations during METEOR cruise M77/3 (2013)
    PANGAEA
    Details
    Publikationsdatum: 2024-06-26
    Schlagwort(e): Ammonium; Biogenic silica; Carbon, organic, particulate; Chlorophyll a; Climate - Biogeochemistry Interactions in the Tropical Ocean; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Device type; Event label; Latitude of event; Longitude of event; M77/3; M77/3-CTD15; M77/3-CTD18; M77/3-CTD20; M77/3-CTD21; M77/3-CTD23; M77/3-CTD24; M77/3-CTD25; M77/3-CTD28; M77/3-CTD29; M77/3-CTD31; M77/3-CTD33; M77/3-CTD35; M77/3-CTD58; M77/3-CTD59; M77/3-CTD6; M77/3-CTD63; M77/3-CTD65; M77/3-CTD7; M77/3-CTD71; Meteor (1986); Neodymium, dissolved; Neodymium, standard deviation; Nitrate; Nitrite; Nitrogen, organic, dissolved; Nitrogen, organic, particulate; Oxygen; Phosphate; Phosphate, organic, dissolved; Phosphorus, organic, particulate; Pressure, water; Quality flag; Salinity; Sample code/label; SFB754; Silicate; Temperature, water; ε-Neodymium
    Materialart: Dataset
    Format: text/tab-separated-values, 738 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
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