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  • 11
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    Water qaulity measured by Australian Government agencies (1960-1999) (2020)
    PANGAEA
    Details
    Publikationsdatum: 2023-03-14
    Schlagwort(e): Conductivity, electrical; DATE/TIME; endorheic lake; hydrologic changes; Lake_George; Lake George, NSW, Australia; Landsat; long record; pH; remote sensing; Sentinel; Temperature, water
    Materialart: Dataset
    Format: text/tab-separated-values, 1029 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 12
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    Strontium, neodymium and lead isotopes in dust from source area in northern South Australia and the northwestern corner of Western Australia, samples A, B and C (2019)
    PANGAEA
    Details
    Publikationsdatum: 2023-03-22
    Schlagwort(e): DUST; Dust_A; Dust_B; Dust_C; Dust sample; Event label; Geochemical fingerprinting; Latitude of event; Lead-206/Lead-204 ratio; Lead-207/Lead-204 ratio; Lead-208; Lead-208/Lead-204 ratio; Longitude of event; Nd isotopes; Neodymium-143/Neodymium-144 ratio; Particle source area; Particle source area. Sr Nd Pb isotopes; Pb isotopes; Sample material; Site; Site A; Site B; Site C; Sr isotopes; Strontium-87/Strontium-86 ratio; Thorium; Uranium; ε-Neodymium (0)
    Materialart: Dataset
    Format: text/tab-separated-values, 30 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 13
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    Mg/Ca variability in Globigerinoides ruber tests
    PANGAEA
    In:  Supplement to: Sadekov, Aleksey Y; Eggins, Stephen M; De Deckker, Patrick; Kroon, Dick (2008): Uncertainties in seawater thermometry deriving from intratest and intertest Mg/Ca variability in Globigerinoides ruber. Paleoceanography, 23(1), PA1215, https://doi.org/10.1029/2007PA001452
    Details
    Publikationsdatum: 2023-05-12
    Beschreibung: Laser ablation inductively coupled plasma-mass spectrometry microanalysis of fossil and live Globigerinoides ruber from the eastern Indian Ocean reveals large variations of Mg/Ca composition both within and between individual tests from core top or plankton pump samples. Although the extent of intertest and intratest compositional variability exceeds that attributable to calcification temperature, the pooled mean Mg/Ca molar values obtained for core top samples between the equator and 〉30°S form a strong exponential correlation with mean annual sea surface temperature (Mg/Ca mmol/mol = 0.52 exp**0.076SST°C, r**2 = 0.99). The intertest Mg/Ca variability within these deep-sea core top samples is a source of significant uncertainty in Mg/Ca seawater temperature estimates and is notable for being site specific. Our results indicate that widely assumed uncertainties in Mg/Ca thermometry may be underestimated. We show that statistical power analysis can be used to evaluate the number of tests needed to achieve a target level of uncertainty on a sample by sample case. A varying bias also arises from the presence and varying mix of two morphotypes (G. ruber ruber and G. ruber pyramidalis), which have different mean Mg/Ca values. Estimated calcification temperature differences between these morphotypes range up to 5°C and are notable for correlating with the seasonal range in seawater temperature at different sites.
    Materialart: Dataset
    Format: application/zip, 2 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 14
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    Chronology, dose rates, and stable isotope record of sediment core MD03-2607
    PANGAEA
    In:  Supplement to: Lopes dos Santos, Raquel A; Wilkins, Michael J; De Deckker, Patrick; Schouten, Stefan (2012): Late Quaternary productivity changes from offshore Southeastern Australia: A biomarker approach. Palaeogeography, Palaeoclimatology, Palaeoecology, 363-364, 48-56, https://doi.org/10.1016/j.palaeo.2012.08.013
    Details
    Publikationsdatum: 2023-05-12
    Beschreibung: Reconstructions of primary productivity at low latitudes have been the focus of several studies to better understand how the export of nutrient-rich, intermediate Southern Ocean (SO) waters influences productivity at these latitudes. This was triggered by the general observation of minima in the planktonic foraminiferal d13C values during deglaciations, which was interpreted as an isotopic signal of intermediate SO waters, together with concomitant increase in diatom productivity at some equatorial sites. However, the impact of these SO waters on productivity at higher latitudes is not well constrained. Here, we compare a high-resolution planktonic foraminiferal d13C record with total organic carbon and biomarker records for Proboscia diatoms and haptophytes from a core offshore Southeastern Australia (SEA). This shows that SEA received intermediate SO waters during deglaciations but it did not result in increased productivity during these periods. Instead, the highest primary productivity period, as shown by total organic carbon and alkenone accumulation rates, was during Last Glacial Maximum while Proboscia diatoms mainly proliferated during interglacials and Marine Isotope Stage 3, matching periods of increased diatom productivity in some sites of the Eastern Equatorial Pacific. Our study suggests that increased primary productivity offshore SEA is mainly due to stronger westerlies winds during glacial while Proboscia diatom productivity is likely to be also controlled by the transport of silicic acid to this area.
    Schlagwort(e): NIOZ_UU; NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University
    Materialart: Dataset
    Format: application/zip, 2 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 15
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    Grain-size distributions and bulk chemistry of sediment core MD00-2361 (2014)
    PANGAEA
    In:  Supplement to: Stuut, Jan-Berend W; Temmesfeld, Felix; De Deckker, Patrick (2014): A 550 ka record of aeolian activity near North West Cape, Australia: inferences from grain-size distributions and bulk chemistry of SE Indian Ocean deep-sea sediments. Quaternary Science Reviews, 83, 83-94, https://doi.org/10.1016/j.quascirev.2013.11.003
    Details
    Publikationsdatum: 2023-01-13
    Beschreibung: The terrigenous fraction of sediments from a deep-sea sediment core recovered from the northwestern Western Australian continental slope offshore North West Cape, SE Indian Ocean, reveals a history of Western Australian climate throughout the last 550 ka. End-member modelling of a data set of grain-size distributions (n = 438) of the terrigenous sediment fraction allows to interpret the record in terms of aeolian and fluvial sediment deposition, both related to palaeo-environmental conditions in the North West Cape area. The data set can be best described by two aeolian end members and one fluvial one. Changes in the ratio of the two aeolian end members over the fluvial one are interpreted as aridity variations in northwestern Western Australia. These grain-size data are compared with bulk geochemical data obtained by XRF scans of the core. Log-ratios of the elements Zr/Fe and Ti/Ca, which indicate a terrigenous origin, corroborate the grain-size data. We postulate that the mid- to late Quaternary near North West Cape climate was relatively arid during the glacial and relatively humid during the interglacial stages, owing to meridional shifts in the atmospheric circulation system. Opposite to published palaeo-environmental records from the same latitude (20°S) offshore Chile and offshore Namibia, the Australian aridity record does not show the typical southern hemisphere climate variability of humid glacials and dry interglacials, which we interpret to be the result of the relatively large land mass of the Australian continent, which emphasises a strong monsoonal climatic system.
    Schlagwort(e): IMAGES; International Marine Global Change Study
    Materialart: Dataset
    Format: application/zip, 6 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 16
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    Abrupt vegetation change after the Late Quaternary megafaunal extinction in southeastern Australia (2013)
    PANGAEA
    In:  Supplement to: Lopes dos Santos, Raquel A; De Deckker, Patrick; Hopmans, Ellen C; Magee, John W; Mets, Anchelique; Sinninghe Damsté, Jaap S; Schouten, Stefan (2013): Abrupt vegetation change after the Late Quaternary megafaunal extinction in southeastern Australia. Nature Geoscience, 6(8), 627-631, https://doi.org/10.1038/ngeo1856
    Details
    Publikationsdatum: 2023-01-13
    Beschreibung: A substantial extinction of megafauna occurred in Australia between 50 and 45 kyr ago, a period that coincides with human colonization of Australia. Large shifts in vegetation also occurred around this time, but it is unclear whether the vegetation changes were driven by the human use of fire-and thus contributed to the extinction event-or were a consequence of the loss of megafaunal grazers. Here we reconstruct past vegetation changes in southeastern Australia using the stable carbon isotopic composition of higher plant wax n-alkanes and levels of biomass burning from the accumulation rates of the biomarker levoglucosan from a well-dated sediment core offshore from the Murray-Darling Basin. We find that from 58 to 44 kyr ago, the abundance of plants with the C-4 carbon fixation pathway was generally high-between 60 and 70%. By 43 kyr ago, the abundance of C-4 plants dropped to 30% and biomass burning increased. This transient shift lasted for about 3,000 years and came after the period of human arrival and directly followed megafauna extinction at 48.9-43.6 kyr ago. We conclude that the vegetation shift was not the cause of the megafaunal extinction in this region. Instead, our data are consistent with the hypothesis that vegetation change was the consequence of the extinction of large browsers and led to the build-up of fire-prone vegetation in the Australian landscape.
    Materialart: Dataset
    Format: application/zip, 3 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 17
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    Isotope analysis from sediment core EDC 3 (2018)
    PANGAEA
    Details
    Publikationsdatum: 2023-01-13
    Schlagwort(e): File format; File name; File size; IMAGES; International Marine Global Change Study; Uniform resource locator/link to file
    Materialart: Dataset
    Format: text/tab-separated-values, 4 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 18
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    Speleothem data from the Frankcombe cave (2018)
    PANGAEA
    Details
    Publikationsdatum: 2023-01-13
    Schlagwort(e): IMAGES; International Marine Global Change Study
    Materialart: Dataset
    Format: application/zip, 2.8 kBytes
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 19
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    Sea-surface temperatures estimated using planktonic foraminifera of sediment core FR1/94-GC3 from the East Tasman Plateau, Australia (2018)
    PANGAEA
    Details
    Publikationsdatum: 2023-01-13
    Schlagwort(e): Age, dated; Event label; FR1/94-GC3; GC; Gravity corer; Sea surface temperature, annual mean; Sea surface temperature, annual mean, maximum; Sea surface temperature, annual mean, maximum, standard deviation; Sea surface temperature, annual mean, minimum; Sea surface temperature, annual mean, minimum, standard deviation; Sea surface temperature, annual mean, standard deviation; Southwest Pacific Ocean; Squared chord distance; Squared chord distance, minimum
    Materialart: Dataset
    Format: text/tab-separated-values, 873 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 20
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    (Fig. 7B, 7D) Continental humidity and total dust of sediment core MD00-2361 (2014)
    PANGAEA
    Details
    Publikationsdatum: 2023-01-13
    Schlagwort(e): AGE; IMAGES; International Marine Global Change Study; log-ratio end members; MD00-2361; North West Cape, Western Australia; PC; Piston corer; Sum of end members
    Materialart: Dataset
    Format: text/tab-separated-values, 861 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
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