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  • 2020-2024  (40)
  • 1995-1999
  • 2020  (40)
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  • 2020-2024  (40)
  • 1995-1999
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  • 1
    Publikationsdatum: 2023-05-31
    Beschreibung: To identify environmental causes for past changes in vegetation in subtropical East Asia, we present carbon isotope compositions of plant-wax n-alkanes and provide estimates of the C4-plant contribution across the past four glacial terminations and interglacials, based on cores recovered from the northern South China Sea. Our results show a comparable C4-plant contribution between the Last Glacial Maximum (LGM) and the Holocene. An increase of the C4-plant contribution by 15–20% is found for Terminations IV, II and I relative to subsequent interglacial peaks, coeval with an expansion of Cyperaceae and Poaceae. In contrast, Termination V reveals a lower C4-plant contribution than Marine Isotope Stage (MIS) 11c. The data exhibit a long-term trend, with a stepwise increase of the C4-plant contribution across interglacials MIS 11c, 9e, 7e and 1. We suggest that no substantial changes in humidity levels over glacial-interglacial cycles occurred facilitating a similar C3/C4-plant ratio for the LGM and the Holocene. Instead, deglacial sea-level rises caused an extensive development of floodplains and wetlands on the exposed continental shelf, providing habitats for the spread of C4 sedges and grasses. The progressive subsidence of Chinese coastal areas and the broadening of the continental shelf over the late Quaternary explains the nearly absence of C4 plant occurrence during Termination V and a gradual increase of the C4-plant contribution across interglacial peaks. Taken together, changes in coastal environments should be considered when interpreting marine-based vegetation reconstructions from subtropical Asia.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , peerRev
    Format: application/pdf
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Publikationsdatum: 2023-02-07
    Beschreibung: Fractional abunances of isoprenoid GDGTs calculated from the peak areas detected for the molecule peaks in the HPLC chromatograms. These data are an addition to the already archived TEX86 and UK'37 data in core-top sediments from off Indonesia (doi:10.1594/PANGAEA.823057).
    Schlagwort(e): Acyclic glycerol dialkyl glycerol tetraether, fractional abundance; Crenarchaeol, fractional abundance; Crenarchaeol isomer, fractional abundance; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Dicyclic glycerol dialkyl glycerol tetraether, fractional abundance; Elevation of event; Event label; fractional abundance; GDGTs; GeoB10008-4; GeoB10010-1; GeoB10014-1; GeoB10015-1; GeoB10016-2; GeoB10022-3; GeoB10024-3; GeoB10025-3; GeoB10026-2; GeoB10027-3; GeoB10028-4; GeoB10029-3; GeoB10031-3; GeoB10032-1; GeoB10033-5; GeoB10034-3; GeoB10036-3; GeoB10037-2; GeoB10038-3; GeoB10039-3; GeoB10040-3; GeoB10041-3; GeoB10043-2; GeoB10044-3; GeoB10047-1; GeoB10049-5; GeoB10050-1; GeoB10058-1; GeoB10059-1; GeoB10061-5; GeoB10063-5; GeoB10064-5; GeoB10066-6; GeoB10067-5; GeoB10068-1; GeoB10069-4; High Performance Liquid Chromatography (HPLC); Latitude of event; Longitude of event; Monocyclic glycerol dialkyl glycerol tetraether, fractional abundance; MSN; MUC; MultiCorer; Multiple opening/closing net; PABESIA; SO184/1; SO184/2; Sonne; Tricyclic glycerol dialkyl glycerol tetraether, fractional abundance
    Materialart: Dataset
    Format: text/tab-separated-values, 288 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    Publikationsdatum: 2023-06-27
    Schlagwort(e): African Humid Period; Candona sp., juvenile, δ13C; Candona sp., juvenile, δ18O; DEPTH, sediment/rock; Green Sahara; High Atlas Mountains, Marocco; Holocene; Lake_Tislit; Palaeoclimate reconstructions; RUSC; Russian corer; vegetation model simulations
    Materialart: Dataset
    Format: text/tab-separated-values, 348 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    Publikationsdatum: 2023-06-27
    Schlagwort(e): African Humid Period; DEPTH, sediment/rock; Green Sahara; High Atlas Mountains, Marocco; Holocene; Lake_Tislit; Palaeoclimate reconstructions; Precipitation, April; Precipitation, August; Precipitation, December; Precipitation, February; Precipitation, January; Precipitation, July; Precipitation, June; Precipitation, March; Precipitation, May; Precipitation, November; Precipitation, October; Precipitation, September; RUSC; Russian corer; Transfer Function Technique (TFT); vegetation model simulations
    Materialart: Dataset
    Format: text/tab-separated-values, 1932 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 5
    Publikationsdatum: 2023-06-27
    Schlagwort(e): African Humid Period; DEPTH, sediment/rock; Green Sahara; High Atlas Mountains, Marocco; Holocene; Lake_Tislit; Palaeoclimate reconstructions; RUSC; Russian corer; Temperature, calculated; Transfer Function Technique (TFT); vegetation model simulations
    Materialart: Dataset
    Format: text/tab-separated-values, 1932 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
    Publikationsdatum: 2023-07-20
    Beschreibung: The data set contains lipid biomarker and bulk organic matter data from two sediment cores in the Shaban Deep, in the northern Red Sea. One core is deposited in the hypersaline brine (GeoB7805-1 2) and the other core (GeoB7807-2) is deposited outside the brine. The data set compares the lipid biomarker signals in the two deposition settings. For both cores the data set contains total organic carbon data, total nitrogen data, bulk organic matter carbon and hydrogen isotope data, long-chain n-alkane concentrations, alkenone concentrations, long- and short-chain fatty acid concentrations, long-chain n-alkane and long-chain fatty acid average chain length and carbon preference index data, UK37 data, stable carbon and hydrogen isotope data for long-chain n-alkanes, alkenones, and long- and short chain fatty acids.
    Schlagwort(e): Alkenones; Center for Marine Environmental Sciences; fatty acids; lipid biomarkers; marine organic matter degradation; MARUM; n-alkanes; particulate organic matter; Red Sea; Shaban Deep; stable carbon isotopes δ13C; stable hydrogen isotopes δ2H
    Materialart: Dataset
    Format: application/zip, 3 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 7
    Publikationsdatum: 2023-08-16
    Schlagwort(e): African Humid Period; Age, 14C calibrated, IntCal13 (Reimer et al., 2013); Age, dated; Age, dated standard deviation; Calendar age, maximum/old; Calendar age, minimum/young; DEPTH, sediment/rock; Green Sahara; High Atlas Mountains, Marocco; Holocene; Laboratory code/label; Lake_Tislit; Palaeoclimate reconstructions; Probability; RUSC; Russian corer; vegetation model simulations
    Materialart: Dataset
    Format: text/tab-separated-values, 48 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 8
    Publikationsdatum: 2023-11-01
    Schlagwort(e): Acer; African Humid Period; Alisma; Alnus; Apiaceae; Artemisia; Asphodelus; Asteraceae; Berberis vulgaris; Boraginaceae; Brassicaceae; Calystegia fretes; Campanulaceae; Caryophyllaceae; Castilleja fissiflolia; Cedrus atlantica; Centaurea; Cereales; Chenopodiaceae; Cichorioideae; Cistus; Convolvulus althaeoides; Counting, palynology; Cupressaceae; Cyperaceae; Daphne; DEPTH, sediment/rock; Digitalis; Ephedra; Eucalyptus; Euphorbiaceae; Fabaceae; Fagus; Fraxinus; Geranium; Green Sahara; Helianthemum; Hibiscus; High Atlas Mountains, Marocco; Holocene; Ilex aquifolium; Illecebrum; Juncus; Lake_Tislit; Lamiaceae; Liliaceae; Linum; Lycopodium; Macrochloa tenacissima; Malva sylvestris; Myriophyllum spicatum; Nerium; Olea; Ostrya; Palaeoclimate reconstructions; Papaver; Pedicularis; Phillyrea; Pinus; Pistacia; Plantago; Poaceae; Polygonum; Populus; Potamogeton; Primulaceae; Pseudoschizaea circula; Quercus; Ranunculus; Rhus; Rosaceae; Rubiaceae; Rumex; RUSC; Russian corer; Salix; Salvadora; Saxifraga; Scabiosa; Scrophularia; Taxus; Typha angustifolia; Typha latifolia; Ulmaceae; Urtica; vegetation model simulations; Veronica; Vitis
    Materialart: Dataset
    Format: text/tab-separated-values, 12397 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 9
    Publikationsdatum: 2023-12-18
    Schlagwort(e): AGE; Center for Marine Environmental Sciences; COMPCORE; Composite Core; Compound-specific carbon isotopes; East Asian monsoon; Estimated; GeoB16602; MARUM; n-Alkane C4 plant; Plant-wax lipids; South China Sea; Standard error; Vegetation composition
    Materialart: Dataset
    Format: text/tab-separated-values, 362 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 10
    Publikationsdatum: 2023-12-18
    Schlagwort(e): AGE; Center for Marine Environmental Sciences; Compound-specific carbon isotopes; Depth, bottom/max; Depth, composite; DEPTH, sediment/rock; Depth, top/min; East Asian monsoon; Event label; GC; GeoB16602-4; GeoB16602-5; GeoB16602-7; GeoB16602-8; Gravity corer; INVERS; MARUM; MeBo; MeBo (Meeresboden-Bohrgerät); n-Alkane, average chain length; n-Alkane C29, δ13C; n-Alkane C29, δ13C, standard deviation; n-Alkane C31, δ13C; n-Alkane C31, δ13C, standard deviation; Plant-wax lipids; Section; SO221; Sonne; South China Sea; Vegetation composition
    Materialart: Dataset
    Format: text/tab-separated-values, 1445 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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