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  • PANGAEA  (88)
  • Nature Publishing Group  (5)
  • Sage
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  • 1
    Electronic Resource
    Electronic Resource
    Evidence for a higher natural uranium content in world rivers (reply) (1979)
    [s.l.] : Nature Publishing Group
    Nature 282 (1979), S. 112-112 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MANGINI REPLIES-Our conclusion that in the Handschusheimer Feld area the influence of uranium from phosphate fertilisers is small was derived both from the low uranium contents of groundwater and river water, more importantly, from their high AU (-1.6). We appreciate the opportunity to clarify a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/282112b0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Co-fluxes and growth rates in ferromanganese deposits from central Pacific seamount areas (1983)
    [s.l.] : Nature Publishing Group
    Nature 304 (1983), S. 716-719 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In early diagenetic and mixed type nodules Co displays a positive correlation with Fe (r = 0.77)3 and no correlation to Mn, whereas in hydrogenetic nodules Co correlates to Mn (r = 0.79)3. Hydrogenetic nodules and crusts show generally higher Co contents than diagenetically formed nodules. This ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/304716a0
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  • 3
    Electronic Resource
    Electronic Resource
    10 Be-dating of a manganese crust from Central North Pacific and implications for ocean palaeocirculation (1984)
    [s.l.] : Nature Publishing Group
    Nature 309 (1984), S. 540-543 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] During RV Valdivia cruise VA 13-2, 1976, a very thick ferromanganese crust (20-40 cm) was dredged near the summit of a submarine peak at a depth of 4,830m in the Central Pacific7'8. In this crust, which directly overlies altered basaltic rock, three macroscopically distinguishable main zones (top ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/309540a0
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  • 4
    Electronic Resource
    Electronic Resource
    Evidence for a higher natural uranium content in world rivers (1979)
    [s.l.] : Nature Publishing Group
    Nature 278 (1979), S. 337-339 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The uranium content of river waters varies by about two orders of magnitude, from 0.04 jxg G ? for the Amazonas, to a few lAgl"1 (refs 1-5). This higher uranium content is, however, suspected to be partly of anthropogenic origin due to uranium derived from phosphate fertilisers5. In fact, compared ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/278337a0
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  • 5
    Electronic Resource
    Electronic Resource
    Possible solar origin of the 1,470-year glacial climate cycle demonstrated in a coupled model (2005)
    [s.l.] : Nature Publishing Group
    Nature 438 (2005), S. 208-211 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Many palaeoclimate records from the North Atlantic region show a pattern of rapid climate oscillations, the so-called Dansgaard–Oeschger events, with a quasi-periodicity of ∼1,470 years for the late glacial period. Various hypotheses have been suggested to explain these rapid ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature04121
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  • 6
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    COMNISPA II: Update of a mid-European isotope climate record, 11 ka to present (2013)
    Sage
    In: Holocene
    Details
    Publication Date: 2013-04-19
    Description: We present an update (COMNISPA II) of a precisely dated, high-resolution speleothem 18 O record from the Austrian Alps. COMNISPA II consists of five stalagmites from Spannagel Cave, which have comparable 18 O values within periods of simultaneous growth and show similar 18 O variations on centennial to millennial timescales. This allows combining the five stalagmites to one composite record using a newly developed statistical approach. The COMNISPA II stack differs slightly from the previous version, but is better constrained because of additional stalagmites used for the reconstruction and a more objective method used for constructing the composite record. Furthermore, the record now covers the last 11 ka and shows variations in 18 O values by about 2. As previously shown, these variations compare well with other records in central Europe and the North Atlantic, and thus reflect a large-scale climate evolution.
    Print ISSN: 0959-6836
    Electronic ISSN: 1477-0911
    Topics: Geography , Geosciences
    Published by Sage
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  • 7
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    Cuban stalagmite suggests relationship between Caribbean precipitation and the Atlantic Multidecadal Oscillation during the past 1.3 ka (2012)
    Sage
    In: Holocene
    Details
    Publication Date: 2012-11-23
    Description: Here we present the first high-resolution 18 O record of a stalagmite from western Cuba. The record reflects precipitation variability in the northwestern Caribbean during the last 1.3 ka and exhibits a correlation to the Atlantic Multidecadal Oscillation (AMO). This suggests a relationship between Caribbean rainfall intensity and North Atlantic sea-surface temperature (SST) anomalies. A potential mechanism for this relationship may be the strength of the Thermohaline Circulation (THC). For a weaker THC, lower SSTs in the North Atlantic possibly lead to a southward shift of the Intertropical Convergence Zone and drier conditions in Cuba. Thus, this Cuban stalagmite records drier conditions during cold phases in the North Atlantic such as the ‘Little Ice Age’. This study contributes to the understanding of teleconnections between North Atlantic SSTs and northern Caribbean climate variability during the past 1.3 ka.
    Print ISSN: 0959-6836
    Electronic ISSN: 1477-0911
    Topics: Geography , Geosciences
    Published by Sage
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  • 8
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    Human adaptation strategies to abrupt climate change in Puerto Rico ca. 3.5 ka (2015)
    Sage
    In: Holocene
    Details
    Publication Date: 2015-03-03
    Description: The connection between climatic change and social response is complex because change articulates a number of inter-related factors. Human decisions are filtered by social buffers – including social memory, risk perception, and cultural priorities – and the rate and scale of climate change is usually much larger than the scale of human decision-making. In this article, we provide information on climate change based on precisely dated speleothems with the response evident in archaeological sites that have radiocarbon date ranges within the same time frame. A stalagmite recovered from within the catchment area for aquifer recharge of the Pre-Arawak site of Angostura in Barceloneta, Puerto Rico, shows that a significant wet period occurred between 3.9 and 3.1 ka (primarily centered at 3.5 ka). We investigate the effect that this increase in precipitation had on the earliest occupations on the island in the context of palaeoenvironmental, geoarchaeological, and archaeological records from Angostura, Maruca, and Paso del Indio. Our analysis suggests the presence of two different adaptation strategies: settlement relocation and microlandscape modification. Our study concludes that the social response to change cannot be seen as monolithic given that human behavior, even within the same period, addresses the needs of individual groups with different priorities. This multiplicity of responses can indeed enhance resilience as social support can continue through alliances and exchanges, strengthening social bonds that can help buffer catastrophes. The results can help shed light on the range of adaptation strategies to change encompassed within the manifestations of social resilience or vulnerability.
    Print ISSN: 0959-6836
    Electronic ISSN: 1477-0911
    Topics: Geography , Geosciences
    Published by Sage
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  • 9
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    Beryllium, thorium and protactinium isotope ratios in sediments from the Galapagos microplate
    PANGAEA
    In:  Supplement to: Frank, Martin; Eckhardt, Joerg-Detlef; Eisenhauer, Anton; Kubik, Peter W; Dittrich-Hannen, Beate; Segl, Monika; Mangini, Augusto (1994): Beryllium 10, thorium 230, and protactinium 231 in Galapagos microplate sediments: Implications of hydrothermal activity and paleoproductivity changes during the last 100,000 years. Paleoceanography, 9(4), 559-578, https://doi.org/10.1029/94PA01132
    Details
    Publication Date: 2023-05-12
    Description: Biogenic particle fluxes from highly productive surface waters, boundary scavenging, and hydrothermal activity are the main factors influencing the deposition of radionuclides in the area of the Galapagos microplate, eastern Equatorial Pacific. In order to evaluate the importance of these three processes throughout the last 100 kyr, concentrations of the radionuclides 10Be, 230Th, and 231Pa, and of Mn and Fe were measured at high resolution in sediment samples from two gravity cores KLH 068 and KLH 093. High biological productivity in the surface waters overlying the investigated area has led to 10Be and 231Pa fluxes exceeding production during at least the last 30 kyr and probably the last 100 kyr. However, during periods of high productivity at the up welling centers off Peru and extension of the equatorial high-productivity zone, a relative loss of 10Be and 231Pa may have occurred in these sediment cores because of boundary scavenging. The effects of hydrothermal activity were investigated by comparing the 230Thex concentrations to the Mn/Fe ratios and by comparing the fluxes of 230Th and 10Be which exceed production. The results suggest an enhanced hydrothermal influence during isotope stages 4 and 5 and to a lesser extent during isotope stage 1 in core KLH 093. During isotope stages 2 and 3, the hydrothermal supply of Mn was deposited elsewhere, probably because of changes in current regime or deep water oxygenation. A strong increase of the Mn/Fe ratio at the beginning of climatic stage 1 which is not accompanied by an increase of the 230Thex concentration is interpreted to be an effect of Mn remobilization and reprecipitation in the sediment.
    Keywords: Equatorial East Pacific; HYMAS II; KAL; Kasten corer; KLH068; KLH093; SO60; SO60_68; SO60_93; Sonne
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 10
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    (Table 2) Geochemistry and radionuclides of sediment core SO60-93
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: AGE; Alpha spectrometry; Aluminium oxide; Beryllium-10; Beryllium-10, standard deviation; Calcium carbonate; Density, dry bulk; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Equatorial East Pacific; HYMAS II; Iron oxide, Fe2O3; Isotope ratio mass spectrometry; KAL; Kasten corer; KLH093; Manganese oxide; Neogloboquadrina dutertrei, δ18O; Protactinium-231; Protactinium-231, standard deviation; SO60; SO60_93; Sonne; Thorium-230, supported, uncorrected; Thorium-230, supported, uncorrected standard deviation; Thorium-230 excess; Thorium-230 excess, standard deviation; Thorium-232; Thorium-232, standard deviation; Uranium-234; Uranium-234, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation; X-ray fluorescence (XRF)
    Type: Dataset
    Format: text/tab-separated-values, 1426 data points
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    DATA PANGAEA
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