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  • 1
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    Decadal hydroclimatic variability in the western coastal United States: temporal and spatial variations in precipitation, streamflow, and lake level (2021)
    In:  http://aquaticcommons.org/id/eprint/15829 | 8 | 2014-12-10 23:14:35 | 15829
    Details
    Publication Date: 2021-07-10
    Description: EXTRACT (SEE PDF FOR FULL ABSTRACT):We have analyzed streamflow variations recorded at 15 USGS gauging stations in California during the past 90 years or so. The anomalies (departures from the 1960-1990 mean discharge) of streamflow on annual-to-decadal time scales are strongly correlated with precipitation anomalies in each drainage basin. ... Although causes of the decadal climate (precipitation) variability are not known with certainty, the use of streamflow records may help us understand the relative strengths of moisture sources and shift of the jet stream in atmospheric circulation.
    Keywords: Atmospheric Sciences ; Limnology ; PACLIM ; hydrology
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 79-91
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    PAPER (OA)
  • 2
    Electronic Resource
    Electronic Resource
    Dating Middle Palaeolithic red beds in southern Greece (1984)
    [s.l.] : Nature Publishing Group
    Nature 312 (1984), S. 264-266 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The southern Argolid landscape was shaped by episodic changes in geomorphic stability3 and changes in coastlines4'5, which influenced the subsistence and settlement strategies of the prehistoric and historic peoples of the region. Destabiliz-ation of the landscape, caused by climatic change in the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/312264a0
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    Paper (German National Licenses)
    Fulltext
  • 3
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    (Table 1) 10 Beryllium and CaCO3 at DSDP Holes 86-576B, 86-576, and 86-578
    PANGAEA
    In:  Supplement to: Ku, Teh-Lung; Southon, John R; Vogel, John S; Liang, Z C; Kusakabe, M; Nelson, D Erle (1985): 10Be distributions in Deep Sea Drilling Project Site 576 and Site 578 sediments studied by accelerator mass spectrometry. In: Heath GR; Burckle LH; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 86, 539-546, https://doi.org/10.2973/dsdp.proc.86.122.1985
    Details
    Publication Date: 2023-06-27
    Description: Extension of the 10Be geochronology for deep-sea sediments beyond the limit of late Pliocene age found in published works has been attempted. The results obtained on sediments from Deep Sea Drilling Project (DSDP) Sites 576 and 578 of Leg 86 suggest the feasibility of dating sediments as old as 12 to 15 m.y. At both sites, there have been large changes in sedimentation rate, with the Pleistocene sediments accumulating several times faster than those of the Pliocene, which in turn were deposited several times more rapidly than the late Miocene sediments. The Pleistocene-Pliocene section is considerably thicker in Hole 578 than in Hole 576B: the respective depths for the 7 m.y. time boundary in the two holes are about 125 and about 25 m. These 10Be-based age estimates are in agreement with the paleomagnetic stratigraphies established for the two sites. The suggested enhancement in the oceanic deposition of 10Be before 7 to 9 m.y. ago, as noticed in manganese crusts, has found tentative support from the present sedimentary records. A preliminary search for 10Be production variation during a geomagnetic field reversal has been conducted. In Hole 578, an enhanced 10Be concentration is found in a sample close to the Brunhes/Matuyama reversal boundary. More detailed and systematic measurements are required to confirm this observation, which bears on the detailed behavior of the geomagnetic field during the reversal.
    Keywords: 86-576; 86-576B; 86-578; Atomic absorption spectrometry (AAS); Beryllium-10; Beryllium-10, standard deviation; Beryllium-10/Beryllium-9, standard deviation; Beryllium-10/Beryllium-9 ratio; Calcium carbonate; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Leg86; North Pacific; Sample code/label; see reference(s)
    Type: Dataset
    Format: text/tab-separated-values, 201 data points
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  • 4
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    Accumation rates of manganese in a pelagic sediment core using 231Pa activity (2022)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Description: For a pelagic sediment core taken in the Atlantic Ocean, The decrease of unsupported 231Pa was used for the determination of the accretion rate. Because CaCO3 is a Mn-free diluent, the Mn concentration results and the sediment accumulation rate results are given on a carbonate-free basis. CaCO3 content ofcores raised from below the carbonate compensation level is taken as zero. The in situ density of water-free deep-sea cores was assumed to be 0.7 g/cm³ , this could lead in some cases to an error.
    Keywords: Accumulation rate, manganese; Accumulation rate, non carbonate; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; Geochemistry; Identification; Latitude of event; Longitude of event; Manganese; manganese micronodule; manganese nodule; Neutron activation analysis; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; ocean; PC; Piston corer; RC07; RC0701-RC0708; RC07-4; Robert Conrad; sediment; Sediment type; see description in data abstract
    Type: Dataset
    Format: text/tab-separated-values, 7 data points
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  • 5
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    U-Th isotopes and Fe-Mn composition of layers from the bottom side of Mn nodule SO11_262DK (262GBHF) (2022)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Description: Attempts have been made to study the entire growth history of a manganese nodule from the northern part of Peru Basin in the Pacific using radiochemical profiles of 230Th232Th, 227Th230Th, and 10Be9Be. Combined with the observations on Fe-Mn contents and textural variation, the radiochemical data indicate that the nodule grew more or less concentrically throughout most of its existence since it formed 1.5 my ago, receiving Mn from both bottom water and pore water. This condition appeared to have changed about 180 ky ago when the growth became asymmetric in that the top and bottom sides became fixed in their relative positions on the sea floor. Since then, the bottom side accreted with a fast rate of close to 200 mm/my, apparently fueled by the supply of diagenetically remobilized Mn in pore water from the sediment substrate. In the meantime, the top side accumulated at about 6 mm/my, a value which is in the normal range for deep-sea nodules having their Mn supplied from the hydrogenous source.
    Keywords: 262GBHF; Alpha spectrometry; Deposit type; DEPTH, sediment/rock; Distance; Distance, maximum; Distance, minimum; Dredge, box; DRG_B; Elevation of event; growth; Identification; Iron; Latitude of event; Longitude of event; Manganese; manganese nodules; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; ocean; Peru Basin, Pacific Ocean; SO11; SO11_262DK; Sonne; SOPAC II; Thorium-227; Thorium-227, standard deviation; Thorium-227 excess/Thorium-230 excess activity ratio; Thorium-227 excess/Thorium-230 excess activity ratio, standard deviation; Thorium-230; Thorium-230, standard deviation; Thorium-230 excess/Thorium-232 activity ratio; Thorium-230 excess/Thorium-232 activity ratio, 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
    Type: Dataset
    Format: text/tab-separated-values, 243 data points
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    DATA PANGAEA
  • 6
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    Beryllium isotopes composition of layers from the bottom side of Mn nodule SO11_262DK (262GBHF) (2022)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Description: Attempts have been made to study the entire growth history of a manganese nodule from the northern part of Peru Basin in the Pacific using radiochemical profiles of 230Th232Th, 227Th230Th, and 10Be9Be. Combined with the observations on Fe-Mn contents and textural variation, the radiochemical data indicate that the nodule grew more or less concentrically throughout most of its existence since it formed 1.5 my ago, receiving Mn from both bottom water and pore water. This condition appeared to have changed about 180 ky ago when the growth became asymmetric in that the top and bottom sides became fixed in their relative positions on the sea floor. Since then, the bottom side accreted with a fast rate of close to 200 mm/my, apparently fueled by the supply of diagenetically remobilized Mn in pore water from the sediment substrate. In the meantime, the top side accumulated at about 6 mm/my, a value which is in the normal range for deep-sea nodules having their Mn supplied from the hydrogenous source.
    Keywords: 262GBHF; Atomic absorption spectrometry (AAS); Beryllium-10; Beryllium-10, standard deviation; Beryllium-10/Beryllium-9; Beryllium-10/Beryllium-9, standard deviation; Beryllium-9; Beryllium-9, standard deviation; Deposit type; DEPTH, sediment/rock; Distance; Distance, maximum; Distance, minimum; Dredge, box; DRG_B; Elevation of event; growth; Identification; Iron; Latitude of event; Longitude of event; Manganese; manganese nodules; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; ocean; Peru Basin, Pacific Ocean; SO11; SO11_262DK; Sonne; SOPAC II
    Type: Dataset
    Format: text/tab-separated-values, 89 data points
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    DATA PANGAEA
  • 7
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    Accumation rates of manganese in pelagic sediments using 130Th activity (2022)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Description: For 7 pelagic sediment cores, the decrease in unsupported 130Th activity with depth in the core was used to establish the mean accumulation rate over the last 300 000 years. Because CaCO3 is a Mn-free diluent, the Mn concentration results and the sediment accumulation rate results are given on a carbonate-free basis. CaCO3 content ofcores raised from below the carbonate compensation level is taken as zero. The in situ density of water-free deep-sea cores was assumed to be 0.7 g/cm³ , this could lead in some cases to an error.
    Keywords: Accumulation rate, manganese; Accumulation rate, non carbonate; Calcium carbonate; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; Event label; Geochemistry; Identification; Latitude of event; Longitude of event; Manganese; manganese micronodule; manganese nodule; Neutron activation analysis; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; ocean; PC; Piston corer; RC08; RC08-83; Robert Conrad; sediment; Sediment type; see description in data abstract; V10; V10-95; V12; V12-122; V16; V16-21; V16-75; V18; V18-258; V21; V21-48; Vema; Wet chemistry
    Type: Dataset
    Format: text/tab-separated-values, 52 data points
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    DATA PANGAEA
  • 8
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    Accumation rates of manganese in manganese nodules using total alpha activity (2022)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Description: The manganese content of 4 manganese nodules was determined by atomic absorption. The decrease of total alpha activity was used to evaluate Mn accumulation. Because CaCO3 is a Mn-free diluent, the Mn concentration results and the nodules accumulation rate results are given on a carbonate-free basis. Nodule densities were assumed to be 2.5 g/cm³. The Mn accumulation rates are calculated per unit cross sectional area of the nodule rather than per unit surface area.
    Keywords: Accumulation rate, manganese; Atlantic Ocean; Atomic absorption spectrophotometry; CH05801; CH58-9RD; Chain; Deposit type; DOWNWIND-H; Dredge; Dredge, chain bag; DRG; DRG_C; DWHD47; Elevation of event; Event label; FANB01BD; FANBD-20D; FANFARE-B; Geochemistry; Horizon; Identification; Latitude of event; Longitude of event; Manganese; manganese micronodule; manganese nodule; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Northern_Holiday; North-West Pacific Ocean; NTHL02HO-010PH; NTHL-10; ocean; Pacific Ocean; sediment; see description in data abstract; Spencer F. Baird; Sta 100; Wired profile sonde; WP
    Type: Dataset
    Format: text/tab-separated-values, 15 data points
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  • 9
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    Geochemistry on manganese nodules from Timor (1978)
    PANGAEA
    In:  Supplement to: Margolis, Stanley V; Ku, Teh-Lung; Glasby, Geoffrey P; Fein, J S; Audley-Charles, M G (1978): Fossil manganese nodules from Timor: Geochemical and radiochemical evidence for deep-sea origin. Chemical Geology, 21(3-4), 185-198, https://doi.org/10.1016/0009-2541(78)90044-X
    Details
    Publication Date: 2023-08-28
    Description: Fossil Mn nodules of Cretaceous age from western Timor exhibit chemical, structural and radioisotope compositions consistent with their being of deep-sea origin. These nodules show characteristics similar to nodules now found at depths of 3,500-5,000 m in the Pacific and Indian Oceans. Slight differences in the fine structure and chemistry of these nodules and modern deep-sea nodules are attributed to diagenetic alteration after uplift of enclosing sediments.
    Keywords: NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Noil_Tobee_M; Noni river, Timor
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 10
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    Accumulation rates of manganese in pelagic sediments and nodules (2022)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Description: Accumulation rates of manganese in sediments of thirty-eight deep-sea cores range from 0.1 to 3.4 mg/cm²/ka. Manganese accumulation rates in five nodules range from 0.2 to 1.0 mg/cm²/ka. In the North Pacific, manganese is apparently incorporated into sediments in association with clay or a related phase; in other ocean basins, no generalizations can be drawn from the data presented here. The similarity between nodule and sediment manganese accumulation rates could be coincidence or could reflect the possibility that nodules and sediments accumulate manganese by the same mechanism.
    Keywords: Accumulation rate; Geochemistry; manganese; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; ocean; sediment
    Type: Dataset
    Format: application/zip, 6 datasets
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