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  • 11
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    Recent climate warming drives ecological change in a remote high-Arctic lake (2018)
    Springer Nature
    Details
    Publication Date: 2018-05-01
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 12
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    Surface-circulation change in the Southern Ocean across the Middle Eocene Climatic Optimum: inferences from dinoflagellate cysts and biomarker paleothermometry (2019)
    Copernicus
    Details
    Publication Date: 2019-04-04
    Description: Global climate cooled from the early Eocene hothouse (~ 52–50 Ma) to the latest Eocene (~ 34 Ma). At the same time, the tectonic evolution of the Southern Ocean was characterized by the opening and deepening of circum-Antarctic gateways, which affected both surface- and deep-ocean circulation. The Tasman Gateway played a key role in regulating ocean throughflow between Australia and Antarctica. Southern Ocean surface currents through and around the Tasman Gateway have left recognizable tracers in the spatiotemporal distribution of plankton fossils, including organic-walled dinoflagellate cysts. This spatiotemporal distribution depends on physico-chemical properties of the water masses in which these organisms thrived. The degree to which the geographic path of surface currents (primarily controlled by tectonism) or their physico-chemical properties (significantly impacted by climate) have controlled the composition of the fossil assemblages has, however, remained unclear. In fact, it is yet poorly understood to what extent oceanographic response as a whole was dictated by climate change, independent of tectonics-induced oceanographic changes that operate on longer time scales. To disentangle the effects of tectonism and climate in the southwest Pacific Ocean, we target a climatic deviation from the long-term Eocene cooling trend, a 500 thousand year long global warming phase termed the Middle Eocene Climatic Optimum (MECO; ~ 40 Ma). The MECO warming is unrelated to regional tectonism, and thus provides a test case to investigate the oceans physiochemical response to climate change only. We reconstruct changes in surface-water circulation and temperature in and around the Tasman Gateway during the MECO through new palynological and organic geochemical records from the central Tasman Gateway (Ocean Drilling Program Site 1170), the Otway Basin (southeastern Australia) and the Hampden Section (New Zealand). Our results confirm that dinocyst communities track tectonically driven circulation patterns, yet the variability within these communities can be driven by superimposed temperature change. Together with published results from the east of the Tasman Gateway, our results suggest that as surface-ocean temperatures rose, the East Australian Current extended further southward during the peak of MECO warmth. Simultaneous with high sea-surface temperatures in the Tasman Gateway area, pollen assemblages indicate warm temperate rainforests with paratropical elements along the southeastern margin of Australia. Finally, based on new age constraints we suggest that a regional southeast Australian transgression might have been caused by sea-level rise during MECO.
    Print ISSN: 1814-9340
    Electronic ISSN: 1814-9359
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 13
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    Robust multi-proxy data integration, using late Cretaceous paleotemperature records as a case study (2018)
    Elsevier
    Details
    Publication Date: 2018-10-01
    Print ISSN: 0012-821X
    Electronic ISSN: 1385-013X
    Topics: Geosciences , Physics
    Published by Elsevier
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  • 14
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    Geochemical and palaeontological characterization of a new K-Pg Boundary locality from the Northern branch of the Neo-Tethys: Mudurnu – Göynük Basin, NW Turkey (2015)
    Elsevier
    Details
    Publication Date: 2015-01-01
    Print ISSN: 0195-6671
    Electronic ISSN: 1095-998X
    Topics: Geosciences
    Published by Elsevier
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  • 15
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    Latest Cretaceous climatic and environmental change in the South Atlantic region (2018)
    Details
    Publication Date: 2022-03-02
    Description: Latest Maastrichtian climate change caused by Deccan volcanism has been invoked as a cause of mass extinction at the Cretaceous-Paleogene (K-Pg) boundary (~66.0 Ma). Yet late Maastrichtian climate and ecological changes are poorly documented, in particular on the Southern Hemisphere. Here we present upper Maastrichtian-lower Danian climate and biotic records from the Bajada del Jagüel (BJ) shelf site (Neuquén Basin, Argentina), employing the TEX86 paleothermometer, marine palynology (dinoflagellate cysts), and micropaleontology (foraminifera). These records are correlated to the astronomically tuned Ocean Drilling Program Site 1262 (Walvis Ridge). Collectively, we use these records to assess climatic and ecological effects of Deccan volcanism in the Southern Atlantic region. Both the TEX86-based sea surface temperature (SST) record at BJ and the bulk carbonate δ18O-based SST record of Site 1262 show a latest Maastrichtian warming of ~2.5–4°C, at 450 to 150 kyr before the K-Pg boundary, coinciding with the a large Deccan outpouring phase. Benthic foraminiferal and dinocyst assemblage changes indicate that this warming resulted in enhanced runoff and stratification of the water column, likely resulting from more humid climate conditions in the Neuquén Basin. These climate conditions could have been caused by an expanding and strengthening thermal low over the South American continent. Biotic changes in response to late Maastrichtian environmental changes are rather limited, when compared to the major turnovers observed at many K-Pg boundary sites worldwide. This suggests that environmental perturbations during the latest Maastrichtian warming event were less severe than those following the K-Pg boundary impact.
    Description: Published
    Description: 466–483
    Description: 5A. Paleoclima e ricerche polari
    Description: JCR Journal
    Keywords: 04.04. Geology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 16
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    Label-free stimulated Raman imaging of foraminifera (2017)
    PANGAEA
    In:  Katholieke Universiteit Leuven
    Details
    Publication Date: 2023-01-13
    Keywords: File content; File format; File name; File size; Uniform resource locator/link to file
    Type: Dataset
    Format: text/tab-separated-values, 30 data points
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  • 17
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    (Table S6) Latest Maastrichtian relative abundance of foraminifera of Bass River ODP sediment core (2019)
    PANGAEA
    Details
    Publication Date: 2023-07-24
    Keywords: Anomalinoides acuta; Anomalinoides midwayensis; Anomalinoides simplex; Anomalinoides sp.; Anomalinoides spp.; Bass_River_Site; Benthic foraminifera; Berger-Parker index; Bolivinoides draco draco; BR; Bulimina arkadelphiana; Bulimina referata; Cibicidoides sp.; Cibicidoides spp.; Cibicidoides succedens; Citharina spp.; Clavulinoides trilatera; Coryphostoma decurrens; Coryphostoma incrassata; Coryphostoma plaitum; Counting, foraminifera; Dentalina spp.; DEPTH, sediment/rock; Distance; Dorothia spp.; DRILL; Drilling/drill rig; Eponides plummerae; Foraminifera, benthic, bi/triserial; Foraminifera, benthic, infaunal; Foraminifera, benthic agglutinated; Frondicularia spp.; Gaudryina monmouthensis; Globulina spp.; Gyroidinoides depressus; Gyroidinoides imitata; Gyroidinoides spp.; Gyroidinoides subangulatus; Indeterminata; Lagena spp.; Leg174AX; Lenticulina dissona; Lenticulina globosa; Lenticulina spp.; Marginulina spp.; Neoflabellina spp.; Nodosaria spp.; Nonionella spp.; North American East Coast; Number of taxa; Osangularia plummerae; Praebulimina carseyae; Praebulimina kickapooensis; Praebulimina quadrata; Pseudonodosaria larva; Pseudouvigerina naheolensis; Pseudouvigerina seligi; Pullenia spp.; Pulsiphonina prima; Pyrulina sp.; Quadrimorphina allomorphinoides; Ramulina spp.; Siphogenerinoides eleganta; Siphogenerinoides plummerae; Spiroplectinella spp.; Stilostomella spp.; Sum; Tappanina selmensis; Vaginulina spp.; Valvalabamina spp.; Verneuilina monmouthensis
    Type: Dataset
    Format: text/tab-separated-values, 1922 data points
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  • 18
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    Organic geochemistry and biomarker data from Baffin Bay surface sediments (2023)
    PANGAEA
    Details
    Publication Date: 2023-11-07
    Description: Samples were collected from Baffin Bay in 2008, 2015, and 2017 aboard the CSS Hudson and Amundsen research vessels. The box core and triggers cores were collected at water depths ranging from 267 to 2373 m below sea level. This dataset includes bulk geochemical and lipid biomarker proxy data from these samples. Bulk geochemical datasets include % carbon, % nitrogen and their stable isotopes as measured by EA-IRMS (Elemental Analyzer linked to an Isotope Ratio Mass Spectrometer). Lipid biomarker proxy data include highly-branched isoprenoids and sterols as measured by GC-MS (Gas Chromatograph linked to a Mass Spectrometer) and isoprenoid/hydroxylated glycerol dialkyl glycerol tetraethers as measured by HPLC-MS (High Performance Liquid Chromatography linked to a Mass Spectrometer). Highly-branched isoprenoid and sterol data are presented as concentrations whereas isoprenoid/hydroxylated glycerol dialkyl glycerol tetraethers data are presented as relative abundance. All analytical measurements were performed at the University of Colorado Boulder. Further information on the data and interpretations can be found in Harning et al. (2023).
    Keywords: 2008_029-49_BC; 2008_029-59_TC; Acyclic glycerol dialkyl glycerol tetraether, fractional abundance; AMD17; AMD17_101_BC; AMD17_108_BC; AMD17_111_BC; AMD17_115_BC; AMD17_129_BC; AMD17_176_BC; AMD17_8.1_BC; AMD17_BB2_BC; AMD17_CASQ1_BC-4; AMD17_Disko_Fan_BC; Baffin Bay; BC; beta-Sitosterol, per unit sediment mass; Box corer; Brassicasterol, per unit sediment mass; Calcium carbonate; Campesterol, per unit sediment mass; Carbon; Carbon/Nitrogen ratio; CCGS Amundsen; Core; CORE; Crenarchaeol, fractional abundance; Crenarchaeol regio-isomer, fractional abundance; DEPTH, sediment/rock; Depth, sediment/rock, bottom/maximum; Depth, sediment/rock, top/minimum; Dicyclic glycerol dialkyl glycerol tetraether, fractional abundance; Dinosterol, per unit sediment mass; Elemental analyzer, Thermo Delta V; coupled with Isotope ratio mass spectrometer (IRMS); Elevation of event; Event label; Highly branched isoprenoid lipid extraction according to Belt et al. (2019); Highly branched isoprenoids, C25:1, per unit sediment mass; Highly branched isoprenoids, C25:2, per unit sediment mass; Highly branched isoprenoids, C25:3, HBI III, per unit sediment mass; Highly branched isoprenoids, C25:3, HBI IV, per unit sediment mass; HU2008_029-040_BX; HUD2008/29; Hudson; Hydroxylated acyclic glycerol dialkyl glycerol tetraether, fractional abundance; Hydroxylated dicyclic glycerol dialkyl glycerol tetraether, fractional abundance; Hydroxylated monocyclic glycerol dialkyl glycerol tetraether, fractional abundance; Latitude of event; lipid biomarkers; Longitude of event; marine sediment; Monocyclic glycerol dialkyl glycerol tetraether, fractional abundance; Nitrogen; Organic Geochemistry; TC; Tricyclic glycerol dialkyl glycerol tetraether, fractional abundance; Trigger corer; δ13C, bulk carbonate; δ15N, bulk sediment
    Type: Dataset
    Format: text/tab-separated-values, 301 data points
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  • 19
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    Latest Maastrichtian dinocyst and benthic foraminiferal records of Bass River, Meirs Farm and Search Farm sediment cores, New Jersey, USA (2019)
    PANGAEA
    In:  Supplement to: Vellekoop, Johan; Woelders, Lineke; Sluijs, Appy; Miller, Kenneth G; Speijer, Robert P (2019): Phytoplankton community disruption caused by latest Cretaceous global warming. Biogeosciences, 16(21), 4201-4210, https://doi.org/10.5194/bg-16-4201-2019
    Details
    Publication Date: 2023-12-15
    Description: Phytoplankton responses to a ~ 350 kiloyear long phase of gradual late Maastrichtian (latest-Cretaceous) global warming starting at ~ 66.4 Ma can provide valuable insights into the long-term influences of global change on marine ecosystems. Here we perform micropaleontological analyses on three cores from the New Jersey paleoshelf, to assess the response of phytoplankton using cyst-forming dinoflagellates and benthic ecosystems using benthic foraminifera. Our records show that this Latest Maastrichtian Warming Event (LMWE), characterized by a 4.0 ± 1.3 ⁰C warming of sea-surface waters on the New Jersey paleoshelf, resulted in a succession of nearly monospecific dinoflagellate cyst assemblages, dominated by the species Palynodinium grallator. This response, likely triggered by the combination of warmer and seasonally thermally-stratified seas, appears to have been more intense at offshore sites than at nearshore sites. The LMWE, and related dinoflagellate response, is associated with an impoverished benthic ecosystem. A wider geographic survey of literature data reveals that the dominance of P. grallator is a marker for the LMWE throughout the northern mid-latitudes. While the dinocyst assemblage returned to a stable, normal marine community in the last tens of thousands of years of the Maastrichtian, benthic foraminiferal diversity remained slightly suppressed. Increased ecosystem stress during the latest Maastrichtian potentially primed global ecosystems for the subsequent mass extinction following the K-Pg boundary Chicxulub impact.
    Keywords: Benthic foraminifera; Dinocysts
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 20
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    (Table S4) Latest Maastrichtian concentration of dinoflagellate cysts of Bass River ODP sediment core (2019)
    PANGAEA
    Details
    Publication Date: 2023-12-15
    Keywords: Achilleodinium bianii; Achomosphaera ramulifera; Achomosphaera sagena; Adnatosphaeridium buccinum; Alisocysta circumtabulata; Alisocysta reticulata; Alisogymnium sp.; Andalusiella gabonensis; Andalusiella mauthei; Andalusiella polymorpha; Apteodinium fallax; Areoligera senonensis; Areoligera spp.; Areoligera volata; Bass_River_Site; BR; Carpatella cf. cornuta; Carpatella cornuta; Cerodinium diebelii; Cerodinium pannuceum; Cerodinium speciosum; Cerodinium spp.; Chatangiella tripartita; Chlamydophorella discreta; Chytroeisphaeridia everricula; Cladopyxidium saeptum; Cleistosphaeridium; Cometodinium sp.; Cordosphaeridium; Cordosphaeridium fibrospinosum; Cordosphaeridium fibrospinosum var. cornuta; Cordosphaeridium inodes; Core section number; Coronifera oceanica; Coronifera striolata; Counting, dinoflagellate cysts; Cribroperidinium sp.; Cribroperidinium wetzelii; Cyclonephelium distinctum; Damassadinium californicum; Damassadinium cf. californicum; Deflandrea galeata; Deflandrea tuberculata; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Diconodinium wilsonii; Dinocysts; Dinoflagellate cyst, peridinioids; Dinoflagellate cyst, skolochorate, indeterminata; Dinoflagellate cyst indeterminata; Dinoflagellate cyst per unit mass; Dinogymnium sp.; Diphyes sp.; Disphaerogena carposphaeropsis; Disphaerogena carposphaeropsis var. cornuta; DISTANCE; DRILL; Drilling/drill rig; Druggidium discretum; Druggidium meerensis; Exosphaeridium bifidum; Fibradinium annetorpense; Fibrocysta axialis; Fibrocysta spp.; Florentinia mantellii; Florentinia spp.; Glaphyrocysta castelcasiense; Glaphyrocysta perforata; Glaphyrocysta semitecta; Gonyaulacysta; Hafniasphaera hyalospina; Hafniasphaera septata; Heterosphaeridium heteracanthum; Hystrichokolpoma bulbosum; Hystrichosphaeridium duplum; Hystrichosphaeridium tubiferum; Hystrichosphaeropsis spp.; Hystrichostrogylon sp.; Impagidinium; Isabelidinium; Isabelidinium cretaceum; Kallosphaeridium; Laciniadinium sp.; Lanternosphaeridium; Lanternosphaeridium lanosum; Lanternosphaeridium reinhardtii; Leberidocysta chlamydata; Leg174AX; Lejeunecysta globosa; Lejeunecysta izerzenensis; Lithosphaeridium sp.; Lycopodium (added); Lycopodium (counted); Lycopodium spores counted; Manumiella seelandica; Mass; Membranilarnacia tenella; Microdinium glabrum; Morphogroup; Neonorthidium perforatum; North American East Coast; Oligosphaeridium complex; Operculodinium; Palaeocystodinium; Palaeocystodinium australinum; Palaeocystodinium golzowense; Palaeohystrichophora infusorioides; Palaeoperidinium pyrophorum; Palynodinium cf. grallator; Palynodinium grallator; Phanerodinium sp.; Phelodinium magnificum; Phelodinium tricuspis; Pierceites pentagonia; Pterodininium cretaceum; Pyxidinopsis sp.; Renidinium gracile; Senegalinium bicavatum; Senegalinium dilwynense; Senegalinium microgranulatum; Senegalinium obscurum; Senegalinium spp.; Senoniasphaera inornata; Senoniasphaera protrusa; Senoniasphaera rotundata; Spinidinium densispinatum; Spinidinium sp.; Spiniferites ramosus complex; Spiniferites sp.; Spongodinium delitiense; Tanyosphaeridium xanthiopyxides; Thalassiphora bononiensis; Thalassiphora patula; Thalassiphora pelagica; Trigonpyxidium sp.; Trithyrodinium evittii
    Type: Dataset
    Format: text/tab-separated-values, 5400 data points
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