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  • 1
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    Stable carbon and hydrogen isotope composition of n-alkanes from Mfabeni peatland (2019)
    PANGAEA
    Details
    Publikationsdatum: 2023-06-15
    Schlagwort(e): (C23+C25)/(C23+C25+C29+C31) n-alkanes ratio; AGE; DEPTH, sediment/rock; Ice volume corrected; MF4-12; Mfabeni peatland; n-Alkane C29-C31, δ13C, standard error; n-Alkane C29-C31, δD, standard error; n-Alkane C29-C31 weighted mean, δ13C; n-Alkane C29-C31 weighted mean, δD; VC; Vibro corer
    Materialart: Dataset
    Format: text/tab-separated-values, 325 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 2
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    Age determination, stable carbon, and hydrogen isotope composition of n-alkanes from Mfabeni peatland (2019)
    PANGAEA
    Details
    Publikationsdatum: 2023-06-15
    Beschreibung: The scarcity of continuous, terrestrial, palaeoenvironmental records in eastern South Africa leaves the evolution of late Quaternary climate and its driving mechanisms uncertain. Here we use a ∼7 m long core from Mfabeni peatland (KwaZulu-Natal, South Africa) to reconstruct climate variability for the last 32 000 years (cal ka BP). We infer past vegetation and hydrological variability using stable carbon (δ13Cwax) and hydrogen isotopes (δDwax) of plant-wax n-alkanes and use Paq to reconstruct water table changes. Our results indicate that late Quaternary climate in eastern South Africa did not respond directly to orbital forcing or to changes in sea-surface temperatures (SSTs) in the western Indian Ocean. We attribute the arid conditions evidenced at Mfabeni during the Last Glacial Maximum (LGM) to low SSTs and an equatorward displacement of (i) the Southern Hemisphere westerlies, (ii) the subtropical high-pressure cell, and (iii) the South Indian Ocean Convergence Zone (SIOCZ), which we infer was linked to increased Antarctic sea-ice extent. The northerly location of the high-pressure cell and the SIOCZ inhibited moisture advection inland and pushed the rain-bearing cloud band north of Mfabeni, respectively. The increased humidity at Mfabeni between 19 and 14 cal kyr BP likely resulted from a southward retreat of the westerlies, the high-pressure cell, and the SIOCZ, consistent with a decrease in Antarctic sea-ice extent. Between 14 and 5 cal kyr BP, when the westerlies, the high-pressure cell, and the SIOCZ were in their southernmost position, local insolation became the dominant control, leading to stronger atmospheric convection and an enhanced tropical easterly monsoon. Generally drier conditions persisted during the past ca. 5 cal ka BP, probably resulting from an equatorward return of the westerlies, the high-pressure cell, and the SIOCZ. Higher SSTs and heightened El Niño–Southern Oscillation (ENSO) activity may have played a role in enhancing climatic variability during the past ca. 5 cal ka BP. Our findings highlight the influence of the latitudinal position of the westerlies, the high-pressure cell, and the SIOCZ in driving climatological and environmental changes in eastern South Africa.
    Materialart: Dataset
    Format: application/zip, 2 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 3
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    Unbekannt
    Age determination of core MF4-12 from Mfabeni peatland (2019)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-05
    Schlagwort(e): Age, comment; Age, dated; Age, dated standard error; Age, lower confidence level; Age, upper confidence level; Calendar age, maximum/old; Calendar age, minimum/young; Calibration; Carbon isotopes; Depth, corrected; DEPTH, sediment/rock; Hydrogen isotopes; Laboratory code/label; leaf waxes; lipids; MF4-12; Mfabeni; Mfabeni peatland; n-alkanes; Range; VC; Vibro corer
    Materialart: Dataset
    Format: text/tab-separated-values, 234 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 4
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    Unbekannt
    Radiocarbon ages of sediment core MKD1 (2020)
    PANGAEA
    Details
    Publikationsdatum: 2024-04-11
    Schlagwort(e): Age, 14C AMS; Age, dated; Age, dated standard deviation; Calendar age, maximum/old; Calendar age, minimum/young; DEPTH, sediment/rock; Laboratory code/label; MKD1; Mkhuze, KwaZulu-Natal, South Africa; Mkhuze swamp; PCUWI; Piston corer, UWITEC; Probability; TRACES; Tracing Human and Climate impacts in South Africa
    Materialart: Dataset
    Format: text/tab-separated-values, 84 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 5
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    Unbekannt
    Bulk organic matter composition, n-alkane distribution patterns, and compound-specific stable isotope compositions of modern surface sediments and plants of South Africa's largest freshwater wetland (2021)
    PANGAEA
    Details
    Publikationsdatum: 2024-04-11
    Beschreibung: Surface sediments (n=41) reflecting modern times (uppermost 10 cm) were collected during a November/December 2018 field campaign along the course of the Mkhuze River and a transect into Lake St. Lucia (KwaZulu Natal Province, South Africa). In addition, plant species (n=10) were collected based on previous reports of dominant vegetation communities and local occurrences. All samples were extracted soon after with a mixture of dichloromethane and methanol (9:1), purified, and fractionated. The apolar fraction was finally analyzed for its n-alkane concentrations and corresponding compound-specific carbon and hydrogen isotope compositions. Sub-samples of the surface sediments were also analyzed for (i) organic matter content (total organic carbon) and composition (d13C, carbon-to-nitrogen ratio) after decalcification, and (ii) for thermal indices (Hydrogen Index, R-index, I-index) using Rock-Eval analyses. The study's objective was to evaluate the most extensive freshwater wetland system in South Africa regarding its current condition and functioning by identifying the origin and transport pathways of sedimentary organic matter.
    Schlagwort(e): Carbon, organic, total; Carbon/Nitrogen ratio; d13C; dD; DEPTH, sediment/rock; Event label; Hydrogen index; I-index; Latitude of event; Longitude of event; MK01-10; MK02-2; MK02-3; MK03-1; MK03-2; MK03-3; MK04-1; MK05-1; MK06-1; MK07-2; MK07-3; MK07-4; MK07-5_1; MK07-5_2; MK07-6; MK07-7; MK08-2; MK08-4; MK09-2; MK10-1; MK12-1; MK12-3; MK13-1; MK14-1; MK15-1; MK16-1; MK17-1; MK18-1; MK19-1; MK20-1; MK20-2; MK21-1; MK21-4; MK21-5; MK22-1; MK23-1; MK24-4; MK24-5; MK25-1; MK26-1; MK27-1; MK28-1; MK29-1; MK30-1; MK31-1; MK32-1; MK33-1; MK34-1; MK35-1; MK36-1; MK37-2; Mkuze River; n-Alkane C16; n-Alkane C17; n-Alkane C18; n-Alkane C19; n-Alkane C20; n-Alkane C21; n-Alkane C22; n-Alkane C23; n-Alkane C23, δ13C; n-Alkane C23, δ13C, standard deviation; n-Alkane C24; n-Alkane C25; n-Alkane C25, δ13C; n-Alkane C25, δ13C, standard deviation; n-Alkane C25, δD; n-Alkane C25, δD, standard deviation; n-Alkane C26; n-Alkane C27; n-Alkane C27, δ13C; n-Alkane C27, δ13C, standard deviation; n-Alkane C27, δD; n-Alkane C27, δD, standard deviation; n-Alkane C28; n-Alkane C29; n-Alkane C29, δ13C; n-Alkane C29, δ13C, standard deviation; n-Alkane C29, δD; n-Alkane C29, δD, standard deviation; n-Alkane C30; n-Alkane C31; n-Alkane C31, δ13C; n-Alkane C31, δ13C, standard deviation; n-Alkane C31, δD; n-Alkane C31, δD, standard deviation; n-Alkane C32; n-Alkane C33; n-Alkane C33, δ13C; n-Alkane C33, δ13C, standard deviation; n-Alkane C33, δD; n-Alkane C33, δD, standard deviation; n-Alkane C34; n-Alkane C35; n-Alkane C35, δ13C; n-Alkane C35, δ13C, standard deviation; n-Alkane C35, δD; n-Alkane C35, δD, standard deviation; n-alkanes; Nitrogen, total; organic matter; plant waxes; R-Index; Rock-Eval; Sample comment; Sample type; South Africa; Species; TRACES; Tracing Human and Climate impacts in South Africa; wetland; δ13C, bulk carbonate
    Materialart: Dataset
    Format: text/tab-separated-values, 2231 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 6
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    Multibeam bathymetry raw data (Kongsberg EM710 entire dataset) of RV METEOR during cruise M123 (2021)
    PANGAEA
    Details
    Publikationsdatum: 2024-04-20
    Beschreibung: Multibeam bathymetry raw data using the ship's own Kongsberg EM 710 multibeam echosounder was almost continuously recorded during RV METEOR cruise M123. Data was recorded on 21 days between 2016-02-05 and 2016-02-25. This dataset mostly contains an elongated transit survey parallel to the South African coastline and a survey of the coastal area of Mozambique. The approximate average depth of the entire dataset is around 500m. During data acquisition the Kongsberg EM 122 multibeam echosounder was occasionally switch on simultaneously, thus interference between both systems may have occurred during the survey. The data are archived at the Federal Maritime and Hydrographic Agency of Germany (Bundesamt für Seeschifffahrt und Hydrographie, BSH) and provided to PANGAEA database for data curation and publication. The complete record of ancillary sound velocity profiles (SVP) from the cruise archived at the BSH are added to this dataset. These individual SVPs files however could not be clearly related to any event (ship's log entry), therefore position and datetime of SVP data acquisition is rather uncertain. Data analysis of the raw multibeam data revealed that SVP occasionally has been changed during the cruise. This publication is conducted within the efforts of the German Marine Research Alliance in the core area "Data management and Digitalization" (Deutsche Allianz Meeresforschung, DAM). Data are unprocessed and therefore may contain incorrect depth measurements (artifacts) without further processing. Data can be processed e.g. with the open source software package MB-System (Caress, D. W., and D. N. Chayes, MB-System: Mapping the Seafloor, http://www.mbari.org/products/research-software/mb-system/, 2021).
    Schlagwort(e): Bathymetry; Binary Object; Binary Object (File Size); Binary Object (Media Type); DAM_Underway; DAM Underway Research Data; Data file recording distance; Data file recording duration; DATE/TIME; ELEVATION; Event label; File content; Kongsberg datagram raw file name; LATITUDE; LONGITUDE; M123_0_Underway-2; Multibeam Echosounder; Number of pings; Ship speed; Start of data file, depth; Start of data file, heading; Start of data file recording, date/time; Start of data file recording, latitude; Start of data file recording, longitude; Stop of data file, depth; Stop of data file, heading; Stop of data file recording, date/time; Stop of data file recording, latitude; Stop of data file recording, longitude; Swath-mapping system Simrad EM710 (Kongsberg Maritime AS)
    Materialart: Dataset
    Format: text/tab-separated-values, 13111 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 7
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    Unbekannt
    Multibeam bathymetry raw data (Kongsberg EM 122 entire dataset) of RV METEOR during cruise M123 (2021)
    PANGAEA
    Details
    Publikationsdatum: 2024-04-20
    Beschreibung: Multibeam bathymetry raw data using the ship's own Kongsberg EM 122 multibeam echosounder was almost continuously recorded during RV METEOR cruise M123. Data was recorded on 22 days between 2016-02-05 and 2016-02-26. This dataset mostly contains an elongated transit survey parallel to the South African coastline and a survey of the coastal area of Mozambique. The approximate average depth of the entire dataset is around 1200m. During data acquisition the Kongsberg EM 712 multibeam echosounder was occasionally switch on simultaneously, thus interference between both systems may have occurred during the survey. The data are archived at the Federal Maritime and Hydrographic Agency of Germany (Bundesamt für Seeschifffahrt und Hydrographie, BSH) and provided to PANGAEA database for data curation and publication. The complete record of ancillary sound velocity profiles (SVP) from the cruise archived at the BSH are added to this dataset. These individual SVPs files however could not be clearly related to any event (ship's log entry), therefore position and datetime of SVP data acquisition is rather uncertain. Data analysis of the raw multibeam data revealed that SVP occasionally has been changed during the cruise. This publication is conducted within the efforts of the German Marine Research Alliance in the core area "Data management and Digitalization" (Deutsche Allianz Meeresforschung, DAM). Data are unprocessed and therefore may contain incorrect depth measurements (artifacts) without further processing. Data can be processed e.g. with the open source software package MB-System (Caress, D. W., and D. N. Chayes, MB-System: Mapping the Seafloor, http://www.mbari.org/products/research-software/mb-system/, 2021).
    Schlagwort(e): Bathymetry; Binary Object; Binary Object (MD5 Hash); Binary Object (Media Type); Comment; DAM_Underway; DAM Underway Research Data; Data file recording distance; Data file recording duration; DATE/TIME; ELEVATION; Event label; File content; Kongsberg datagram raw file name; LATITUDE; LONGITUDE; M123; M123_0_Underway-1; Meteor (1986); Multibeam Echosounder; Number of pings; Ship speed; Start of data file, depth; Start of data file, heading; Start of data file recording, date/time; Start of data file recording, latitude; Start of data file recording, longitude; Stop of data file, depth; Stop of data file, heading; Stop of data file recording, date/time; Stop of data file recording, latitude; Stop of data file recording, longitude; Swath-mapping system Simrad EM122 (Kongsberg Maritime AS)
    Materialart: Dataset
    Format: text/tab-separated-values, 9409 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 8
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    Unbekannt
    Palynology of marine sediment core SBQW4, Saldanha Bay (South Africa), early Miocene (2017)
    PANGAEA
    In:  Supplement to: Neumann, Frank Harald; Roberts, David; Cawthra, Hayley C; Carr, Andrew S; Scott, Louis; Durugbo, Ernest; Humphries, Marc; Cowling, Richard; Bamford, Marion; Musekiwa, Chiedza; Machutchon, Michael (2017): Palaeoenvironments during a terminal Oligocene or early Miocene transgression in a fluvial system at the southwestern tip of Africa. Global and Planetary Change, 150, 1-23, https://doi.org/10.1016/j.gloplacha.2017.01.007
    Details
    Publikationsdatum: 2024-02-16
    Beschreibung: A multi-proxy study of an offshore core in Saldanha Bay (South Africa) provides new insights into fluvial deposition, ecosystems, phytogeography and sea-level history during the late Paleogene-early Neogene. Offshore seismic data reveal bedrock topography, and provide evidence of relative sea levels as low as -100 m during the Oligocene. 3D landscape reconstruction reveals hills, plains and an anastomosing river system. A Chattian or early Miocene age for the sediments is inferred from dinoflagellate taxa Distatodinium craterum, Chiropteridium lobospinosum, Homotryblium plectilum and Impagidinium paradoxum. The subtropical forest revealed by palynology includes lianas and vines, evergreen trees, palms and ferns, implying higher water availability than today, probably reduced seasonal drought and stronger summer rainfall. From topography, sedimentology and palynology we reconstruct Podocarpaceaedominated forests, Proto-Fynbos, and swamp/riparian forests with palms and other angiosperms. Rhizophoraceae present the first South African evidence of Palaeogene/Neogene mangroves. Subtropical woodland-thicket with Combretaceae and Brachystegia (Peregrinipollis nigericus) probably developed on coastal plains. Some of the last remaining Gondwana elements on the sub-continent, e.g., Araucariaceae, are recorded. Charred particles signal fires prior to the onset of summer dry climate at the Cape. Marine and terrestrial palynomorphs, together with organic and inorganic geochemical proxy data, suggest a gradual glacio-eustatic transgression. The data shed light on Southern Hemisphere biogeography and regional climatic conditions at the Palaeogene-Neogene transition. The proliferation of the vegetation is partly ascribed to changes in South Atlantic oceanographic circulation, linked to the closure of the Central American Seaway and the onset of the Benguela Current ~14 Ma.
    Schlagwort(e): Achomosphaera ramulifera; Achomosphaera sp.; Aizoaceae; Anacardiaceae; Araliaceoipollenites reticuloides; Araucariacites; Araucariacites australis; Arecipites cf. otagoensis; Arecipites plectilimuratus; Arecipites spp.; Artemisiaepollenites; Baculatisporites; Baumannipollis variaperturatus; Bequaertiodendron; Blaeria-type; Botryococcus; Brachylaena-type; Brachysporisporites; Bruguieria-type; Caesalpiniaceae; Camarazonosporites; Camarazonosporites bankiensis; Canthiumidites spp.; Caprifoliipites viburnoides; Celastraceae; Celtipollenites sp.; cf. Aceripollenites; cf. Byttneripollis; cf. Dacrydiumites; cf. Dichrostachys-type; cf. Dicolpopollis spp.; cf. Fraxinipollis; cf. Quercoidites henrici; cf. Slovakipollis; cf. Styraxipollis stuchliki; cf. Triporotetradites sp.; cf. Verrucatiporites rotundiporus; Charcoal; Chenopodiaceae; Chiropteridium lobospinosum; Chiropteridium sp.; Christensenia-type; Clavatipollenites spp.; Combretaceae; Commiphora-type; Cooksonidium capricornium; Cordosphaeridium minimum; Core; CORE; Corrugatisporites sp.; Crotonipollis spp.; Cryptogrammasporis spp.; Cupaniedites indeterminable; Cupaniedites major; Cupressaceae/Taxodiaceae; Cupuliferoipollenites oviformis; Cyathidites australis; Cymatiosphaera; Cyperaceae; Cyperaceaepollis piriformis; Debarya; DEPTH, sediment/rock; Dinoflagellate indeterminata; Dinoflagellates, total; Diospyropollenites sp.; Distatodinium craterum; Equisetum sp.; Ericipites callidus; Ericipites spp.; Euphorbiaceae; Fabaceae; Foraminifera, linings; Fungal fruit-bodies; Fungal germling; Fungal spores; Fungi; Galium-type; Geraniaceae; Glaphyrocysta sp.; Gleicheniidites; Gleicheniidites spp.; Glencopollis ornatus; Graminidites cf. crassiglobosus; Graminidites cf. neogenicus; Graminidites spp.; Grewia-type; Grootipollis sp.; Hafniasphaera septata; Homotryblium plectilum; Hygrophila-type; Hypha; Hystrichokolpoma rigaudiae; Ilexpollenites margaritatus; Ilexpollenites spp.; Illexpollenites illiacus; Impagidinium paradoxum; Involutisporis; Laevigatosporites haardtii; Leiotriletes maximus; Leiotriletes maxoides; Leiotriletes wolffii; Liliacidites; Liliacidites minutes; Liliacidites spp.; Ludwigia-type; Lycopodiella inundata; Malvaceae; Manilkara-type; Meliaceoidites sp.; Microcachrydites antarcticus; Microfoveolatisporis fromensis; Microsclerotium; Mohria-type; Momipites sp.; Monocolpopollenites; Monocolpopollenites spp.; Mutisiae; Mutisiapollis viteauensis; Myricipites harrisii; Myricipites spp.; Myrtaceidites parvus; Neuradaceae; Oleoidearumpollenites spp.; Operculodinum centrocarpus; Ovoidites sp.; Palmae-trichotomosulcate; Parthenopollenites formosus; Parthenopollenites marcodurensis; Parthenopollenites neshobensis; Peregrinipollis nigericus; Phoenix-type; Podocarpidites; Podocarpidites kamiesberg; Podocarpidites spp.; Podocarpidites torquatus; Pollen, land, total; Polygala-type; Polypodiaceoisporites sp.; Potamogeton-type; Prasinophytes; Propylipollis meyeri; Propylipollis sp.; Proteacidites; Proteacidites bakkeri granulatus; Proteacidites spp.; Pseudoschizaea sp.; Pseudowinterapollis couperi; Psilatricolporites cf. atalangensis; Psilatricolporites crassiexinus; Psilatricolporites operculatus; Psilatricolporites quenua; Pterocelastrus-type; Pterospermella spp.; Quercoidites spp.; Quercopollenites cf. asper; Quercopollenites cf. granulatus; Restionaceae; Reticulatosphaera cf. actinocoronata; Retitriletes spp.; Rhamnaceaepollenites sp.; Rhizophoraceae; Rhoipites alveolatus; Rhoipites arnotiensis; Rhoipites couperi; Rhoipites spp.; Rhuspollenites sp.; Rhynchosia-type; Rosaceae; Rubiaceae; Rugulasporites spp.; Saldanha Bay, South Africa; Santalaceae; Sapotaceoidaepollenites spp.; SBQW4; Scrophulariaceae; Sigmopollis sp.; Simpsonipollis grandis; Solanum-type; Sparganiaceaepollenites barungensis; Spiniferites mirabilis; Spiniferites pseudofurcatus; Spiniferites ramosus; Spiniferites spp.; Spinitricolpites jennerclarkei; Spinitricolpites spp.; Spirostachys-type; Spores, monolete; Spores, trilete; Stereoisporites sp.; Sum; Sum algae; sum aquatics and water plants; Sum charcoal; sum Cryptogams; sum Fungi; sum herbs and shrublets; sum trees and shrubs; Tetracolporopollenites sapotoides; Tetraploea; Thymelipollis sp.; Todisporites spp.; Tricolpites; Tricolpites gillii; Tricolporopollenites; Tricolporopollenites brinkiae; Tricolporopollenites coetzeeae; Tricolporopollenites eofagoides; Tricolporopollenites marginatus; Triorites operculatus; Triporopollenites namaquensis; Tubulifloridites anthemidearum; Tubulifloridites antipodica; Tubulifloridites gigans; Tubulifloridites macroechinatus; Tubulifloridites spp.; Umbeliferoipollenites spp.; Unknown pollen and spores; Urticales; Varia; Verrucatisporites alienus; Verrucatisporites favus; Verrucatisporites spp.; Vitaceae; Zonalapollenites spp.; Zonalopollenites cf. gracilis; Zonalopollenites perisaccate; Zonocostites ramonae; Zygnemataceae
    Materialart: Dataset
    Format: text/tab-separated-values, 5302 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
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