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  • 1
    Online Resource
    Online Resource
    Environmental versus biomineralization controls on the intratest variation in the trace element composition of the planktonic foraminifera G. inflata and G. scitula (2009)
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    In: Paleoceanography, Hoboken, NJ : Wiley, 1986, 24(2009), 1944-9186
    In: volume:24
    In: year:2009
    In: extent:14
    Description / Table of Contents: The intratest variation in the chemical composition of Globorotalia scitula and G. inflata recovered from a sediment trap sample collected at 3000 m in the North Atlantic in early spring has been investigated using laser ablation inductively coupled plasmamass spectrometry and electron microprobe. Mg/Ca, Li/Ca, B/Ca, Mn/Ca, and Ba/Ca vary by up to a factor of 10 through the test walls. Water column properties, including temperature and salinity, are well documented at the trap site, and the observed variations are too large to be explained by vertical migration of the foraminifera. However, changes in calcite precipitation rate, crystal structure, or the chemical composition of the internal calcification reservoir also cannot, by themselves, fully account for the pattern of intratest variability. Nevertheless, the average Mg/Ca for each chamber generally produces a Mg/Ca temperature that matches that measured in the water column. The exception is small, morphologically distinct G. inflata tests that have anomalously high Mg/Ca.
    Type of Medium: Online Resource
    Pages: 14 , Ill., graph. Darst
    ISSN: 1944-9186
    DOI: 10.1029/2009PA001742
    Language: English
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  • 2
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    Authigenic and Detrital Carbonate Nd Isotope Records Reflect Pulses of Detrital Material Input to the Labrador Sea During the Heinrich Stadials (2023)
    Details
    Publication Date: 2023-07-19
    Description: Limited constraints on the variability of the deep‐water production in the Labrador Sea complicate reconstructions of the strength of the Atlantic Meridional Overturning Circulation (AMOC) during the Late Quaternary. Large volumes of detrital carbonates were repeatedly deposited in the Labrador Sea during the last 32 kyr, potentially affecting radiogenic Nd isotope signatures. To investigate this the Nd isotope compositions of deep and intermediate waters were extracted from the authigenic Fe‐Mn oxyhydroxide fraction, foraminiferal coatings, the residual silicates and leachates of dolostone grains. We provide a first order estimation of Nd release via dissolution of detrital carbonates and its contribution to the authigenic ԑNd signatures in the Labrador Sea. During the Last Glacial Maximum the Nd isotope signatures in the Labrador Sea would allow active water mass mixing with more radiogenic ɛNd values (−12.6 and −14) prevailing in its eastern part whereas less radiogenic values (ɛNd ∼ −18.4) were found on the western Labrador slope. The deposition of detrital carbonates during Heinrich stadials (2,1) was accompanied by negative detrital and authigenic Nd isotope excursions (ɛNd ∼ −31) that were likely controlled by dissolution of dolostone or dolostone associated mineral inclusions. This highly unradiogenic signal dominated the authigenic phases and individual water masses in the Labrador Sea, serving as potential source of highly unradiogenic Nd to the North Atlantic region, while exported southward. The Holocene authigenic ɛNd signatures of the coatings and leachates significantly differed from those of the detrital silicates, approaching modern bottom water mass signatures during the Late Holocene.
    Description: Plain Language Summary: The Labrador Sea is an important region for deep water formation and for the ocean circulation in the Atlantic region. Over the last 32 thousand years, numerous discharges from melting glaciers added freshwater to the Labrador Sea which could help understand the future effects of current melting glaciers. This information is necessary to better constrain climate predictions in order to gauge the effects on the Global Ocean Water Circulation. However, past deep water production in the Labrador is still poorly constrained, complicating reconstruction of the Atlantic Meridional Overturning Circulation on different timescales. In this study we investigated changes in deep and intermediate water mass circulation patterns over the last 32 kyr based on the radiogenic Nd isotope compositions that serve as a water mass circulation proxy. Analysis of four marine sediment cores show that the deposition of large volumes of detrital carbonates during studied period had a large effect on the recorded in the sediment column signals. New data suggest active water mass circulation during the maximum extent of glacial ice sheets. The modern day ocean circulation patterns have emerged during the Late Holocene (6 ka).
    Description: Key Points: Estimation of Nd release via dissolution of detrital carbonates and its contribution to the authigenic ԑNd signatures in the Labrador Sea. Dissolution of detrital dolostones in the water column during Heinrich stadials at least partially controlled ɛNd signatures. During the LGM generally more radiogenic signatures possibly indicate active water mass advection and mixing in the Labrador Sea.
    Description: GEOMAR Helmholtz‐Zentrum für Ozeanforschung Kiel http://dx.doi.org/10.13039/501100003153
    Description: Kiel University
    Description: https://doi.org/10.1594/PANGAEA.952659
    Keywords: ddc:551.9 ; Labrador Sea ; Late Quaternary ; Paleoceanography ; neodymium isotopes ; dolostone ; AMOC ; carbonate dissolution ; Heinrich stadials
    Language: English
    Type: doc-type:article
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  • 3
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    Stable isotopes and Mg/Ca measured on multinet samples at station SO225_21 (2016)
    PANGAEA
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    Publication Date: 2023-03-16
    Keywords: AWI_Paleo; Depth, bottom/max; Depth, top/min; DEPTH, water; Magnesium/Calcium ratio; Magnesium/Calcium ratio, standard deviation; MANIHIKI II; Mass spectrometry; MSN; Multiple opening/closing net; Number of species; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Size; SO225; SO225_21-3; Sonne; South Pacific Ocean; Species; δ13C, calcite; δ13C, standard deviation; δ18O, calcite; δ18O, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 331 data points
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  • 4
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    Physical oceanography at station SO225_21 (2016)
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    Publication Date: 2023-03-16
    Keywords: AWI_Paleo; CTD; CTD/Rosette; CTD-RO; DEPTH, water; MANIHIKI II; Oxygen; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Salinity; SO225; SO225_21-1; Sonne; South Pacific Ocean; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 1467 data points
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  • 5
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    Abundance of planktic foraminifera measured on multinet samples at station SO225_21 (2016)
    PANGAEA
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    Publication Date: 2023-03-16
    Keywords: AWI_Paleo; Comment; Depth, bottom/max; Depth, top/min; DEPTH, water; Foraminifera, planktic; Foraminifera, planktic, other; Globigerina bulloides; Globigerinella spp.; Globigerinita glutinata; Globigerinita minuta; Globigerinoides conglobatus; Globigerinoides ruber; Globigerinoides sacculifer; Globoquadrina conglomerata; Globorotalia crassaformis; Globorotalia menardii; Globorotalia spp.; Globorotalia truncatulinoides; Globorotalia tumida; Globorotaloides hexagonus; Globoturborotalita spp.; Hastigerina pelagica; MANIHIKI II; MSN; Multiple opening/closing net; Neogloboquadrina dutertrei; Orbulina universa; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Pulleniatina obliquiloculata; SO225; SO225_21-3; Sonne; South Pacific Ocean; Turborotalita spp.
    Type: Dataset
    Format: text/tab-separated-values, 386 data points
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    DATA PANGAEA
  • 6
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    Rare earth elements measured on water bottle samples at BATS (2017)
    PANGAEA
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    Publication Date: 2023-03-10
    Keywords: BATS15m; Cerium, dissolved; CTD/Rosette; CTD-RO; DEPTH, water; Dysprosium, dissolved; Erbium, dissolved; Europium, dissolved; Gadolinium, dissolved; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; Holmium, dissolved; Lanthanum, dissolved; Lutetium, dissolved; Neodymium, dissolved; Praseodymium, dissolved; Samarium, dissolved; South Atlantic Ocean; Terbium, dissolved; Thulium, dissolved; Ytterbium, dissolved; Yttrium, dissolved
    Type: Dataset
    Format: text/tab-separated-values, 225 data points
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  • 7
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    Rare earth elements measured on water bottle samples at BATS (2017)
    PANGAEA
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    Publication Date: 2023-03-10
    Keywords: BATS2000m; Cerium, dissolved; CTD/Rosette; CTD-RO; DEPTH, water; Dysprosium, dissolved; Erbium, dissolved; Europium, dissolved; Gadolinium, dissolved; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; Holmium, dissolved; Lanthanum, dissolved; Lutetium, dissolved; Neodymium, dissolved; Praseodymium, dissolved; Samarium, dissolved; South Atlantic Ocean; Terbium, dissolved; Thulium, dissolved; Ytterbium, dissolved; Yttrium, dissolved
    Type: Dataset
    Format: text/tab-separated-values, 195 data points
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    DATA PANGAEA
  • 8
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    Isotopic compositions, Mg/Ca ratios and sea surface temperatures of sediment core GeoB10038-4 (2010)
    PANGAEA
    Details
    Publication Date: 2023-03-03
    Keywords: AGE; Calculated, see reference(s); Center for Marine Environmental Sciences; Cibicidoides wuellerstorfi, δ18O; DEPTH, sediment/rock; GeoB10038-4; Globigerinoides ruber, δ18O; Gravity corer (Kiel type); ICP-OES, Perkin-Elmer, Optima 3300R; Magnesium/Calcium ratio; MARUM; Mass spectrometer Finnigan MAT 251; PABESIA; Sea surface temperature, annual mean; SL; SO184/1; Sonne; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 311 data points
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    DATA PANGAEA
  • 9
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    Documentation of sediment cores during SONNE Expedition SO228 from the western tropical Pacific (2013)
    PANGAEA
    In:  Supplement to: Mohtadi, Mahyar; Bergmann, Fenna; Blanquera, Ralph Vinzon; Buleka, Joe; Carag, John Warner; Carriére-Garwood, Jessica; Dassié, Emilie Pauline; Fernando, Allan Gil; Gernhardt, Fabian; Ghasemifard, Homa; Groeneveld, Jeroen; Hathorne, Ed C; Huang, C C; Huang, Enqing; Janßen, Christoph Gregor; Kerrigan, Elizabeth; Kienast, Markus; Kremer, Anne; Kwiatkowski, Cornelia; Lehnen, Christina; Lückge, Andreas; Mai, Anh Hoang; Martínez Méndez, Gema; Meyer-Schack, Birgit; Nishibayashi, Mark Hacker; Plaß, Anna; Quevedo, Jay Mar; Rincon, Miguel; Schwenk, Tilmann; Seeba, Hanno; Setiawan, Riza Yuliratno; Steinke, Stephan; Tevlone, Amanda; Wenau, Stefan; Yu, Pai-Sen (2013): Report and preliminary results of RV SONNE cruise SO-228, Kaohsiung-Townsville, 04.05.2013-23.06.2013, EISPAC-WESTWIND-SIODP. Berichte aus dem MARUM und dem Fachbereich Geowissenschaften der Universität Bremen, 295, 110 pp, urn:nbn:de:gbv:46-00103343-13
    Details
    Publication Date: 2023-03-03
    Description: The core descriptions (chapter 7) summarize the most important results of the analysis of each sediment core following procedures applied during ODP/IODP expeditions. All cores were opened, described, and color-scanned. In the core descriptions the first column displays the lithological data that are based on visual analysis of the core and are supplemented by information from binocular and smear slide analyses. The sediment classification largely follows ODP/IODP convention. Lithological names consist of a principal name based on composition, degree of lithification, and/or texture as determined from visual description and microscopic observations. In the structure column the intensity of bioturbation together with individual or special features (turbidites, volcanic ash layers, plant debris, shell fragments, etc.) is shown. The hue and chroma attributes of color were determined by comparison with the Munsell soil color charts and are given in the color column in the Munsell notation. A GretagMacbethTM Spectrolino spectrophotometer was used to measure percent reflectance values of sediment color at 36 wavelength channels over the visible light range (380-730 nm) on all of the cores. The digital reflectance data of the spectrophotometer readings were routinely obtained from the surface (measured in 1 cm steps) of the split cores (archive half). The Spectrolino is equipped with a measuring aperture with folding mechanism allowing an exact positioning on the split core and is connected to a portable computer. The data are directly displayed within the software package Excel and can be controlled simultaneously. From all the color measurements, for each core the red/blue ratio (700 nm/450 nm) and the lightness are shown together with the visual core description. The reflectance of individual wavelengths is often significantly affected by the presence of minor amounts of oxyhydroxides or sulphides. To eliminate these effects, we used the red/blue ratio and lightness.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 37 datasets
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    DATA PANGAEA
  • 10
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    Multinet and water column properties of station SO225-21 (2016)
    PANGAEA
    In:  Supplement to: Rippert, Nadine; Nürnberg, Dirk; Raddatz, Jacek; Maier, Edith; Hathorne, Ed C; Bijma, Jelle; Tiedemann, Ralf (2016): Constraining foraminiferal calcification depths in the western Pacific warm pool. Marine Micropaleontology, 128, 14-27, https://doi.org/10.1016/j.marmicro.2016.08.004
    Details
    Publication Date: 2023-03-16
    Description: Insight into past changes of upper ocean stratification, circulation, and nutrient signatures rely on our knowledge of the apparent calcification depth (ACD) and ecology of planktonic foraminifera, which serve as archives for paleoceanographic relevant geochemical signals. The ACD of different species varies strongly between ocean basins, but also regionally. We constrained foraminiferal ACDs in the western Pacific warm pool (Manihiki Plateau) by comparing stable oxygen and carbon isotopes (d18Ocalcite, d13Ccalcite) as well as Mg/Ca ratios from living planktonic foraminifera to in-situ physical and chemical water mass properties (temperature, salinity, d18Oseawater, d13CDIC). Our analyses point to Globigerinoides ruber as the shallowest dweller, followed by Globigerinoides sacculifer, Neogloboquadrina dutertrei, Pulleniatina obliquiloculata and Globotaloides hexagonus inhabiting increasingly greater depths. These findings are consistent with other ocean basins; however, absolute ACDs differ from other studies. The uppermost mixed-layer species G. ruber and G. sacculifer denote mean calcification depths of ~95 m and ~120 m, respectively. These Western Pacific ACDs are much deeper than in most other studies and most likely relate to the thick surface mixed layer and the deep chlorophyll maximum in this region. Our results indicate that N. dutertrei appears to be influenced by mixing waters from the Pacific equatorial divergence, while P. obliquiloculata with an ACD of ~160 m is more suitable for thermocline reconstructions. ACDs of G. hexagonus reveal a deep calcification depth of ~450 m in oxygen-depleted, but nutrient-rich water masses, consistent to other studies. As the d13C of G. hexagonus is in near-equilibrium with ambient seawater, we suggest this species is suitable for tracing nutrient conditions in equatorial water masses originating in extra-topical regions.
    Keywords: AWI_Paleo; Paleoenvironmental Reconstructions from Marine Sediments @ AWI
    Type: Dataset
    Format: application/zip, 4 datasets
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