| Abstract: | Reconstruction of Pleistocene glacial cycles from oxygen isotope records identifies dramatic changes in both global climate state and ice sheet size. The Mid-Pleistocene Transition (MPT) is an interval during which global ice sheets underwent a major transition from temporally symmetrical 41-thousand year (kyr) cycles in the Early to Middle Pleistocene to asymmetrical 100-kyr cycles in the Middle to Late Pleistocene. The proposed timing of this transition and potential triggers remains contentious with possible mechanisms ranging from cryosphere dynamics to variations in Earth's energy balance. One suggested driver of the MPT involves the "Regolith Hypothesis", which proposes that the Laurentide Ice Sheet (LIS) underwent fluctuations in ice sheet stability due to changes in subglacial substrate lithology. […] |
| Size: | 117 data points |
| Abstract: | Reconstruction of Pleistocene glacial cycles from oxygen isotope records identifies dramatic changes in both global climate state and ice sheet size. The Mid-Pleistocene Transition (MPT) is an interval during which global ice sheets underwent a major transition from temporally symmetrical 41-thousand year (kyr) cycles in the Early to Middle Pleistocene to asymmetrical 100-kyr cycles in the Middle to Late Pleistocene. The proposed timing of this transition and potential triggers remains contentious with possible mechanisms ranging from cryosphere dynamics to variations in Earth's energy balance. One suggested driver of the MPT involves the "Regolith Hypothesis", which proposes that the Laurentide Ice Sheet (LIS) underwent fluctuations in ice sheet stability due to changes in subglacial substrate lithology. […] |
| Size: | 406 data points |
| Abstract: | Reconstruction of Pleistocene glacial cycles from oxygen isotope records identifies dramatic changes in both global climate state and ice sheet size. The Mid-Pleistocene Transition (MPT) is an interval during which global ice sheets underwent a major transition from temporally symmetrical 41-thousand year (kyr) cycles in the Early to Middle Pleistocene to asymmetrical 100-kyr cycles in the Middle to Late Pleistocene. The proposed timing of this transition and potential triggers remains contentious with possible mechanisms ranging from cryosphere dynamics to variations in Earth's energy balance. One suggested driver of the MPT involves the "Regolith Hypothesis", which proposes that the Laurentide Ice Sheet (LIS) underwent fluctuations in ice sheet stability due to changes in subglacial substrate lithology. […] |
| Size: | 287 data points |
| Abstract: | Osmium isotopes were measured in marine sediments from IODP Site U1536 in the Scotia Sea and in proximal bedrock samples located throughout West Antarctica obtained from the Polar Rock Repository. Sediment samples span ~500–1250 ka, while bedrock samples range from Cenozoic to Precambrian. All materials were digested using inverse aqua regia and analyzed by thermal ionization mass spectrometry and secondary electron multiplier. |
| Size: | 588 data points |
| Abstract: | Osmium isotopes were measured in marine sediments from IODP Site U1536 in the Scotia Sea and in proximal bedrock samples located throughout West Antarctica obtained from the Polar Rock Repository. Sediment samples span ~500–1250 ka, while bedrock samples range from Cenozoic to Precambrian. All materials were digested using inverse aqua regia and analyzed by thermal ionization mass spectrometry and secondary electron multiplier. |
| Size: | 63 data points |
| Abstract: | Despite its widespread use as a model configuration for investigating mixing processes in chemical engineering, the turbulent regime of the T-shaped mixer remains relatively unexplored, in contrast to its well-documented transitional behaviour. To address this gap, we perform direct numerical simulations at Reynolds numbers up to Re = 2000 with a Schmidt number of Sc = 1. The results reveal a streamwise evolution characterised by two distinct regions before the flow approaches a fully developed duct-flow state. In the vicinity of the junction, the dynamics are dominated by a jet-like structure that displays approximate self-similarity resembling that of transitional planar jets. Downstream of this region, turbulence undergoes a decay process in which turbulent kinetic energy, dissipation, and scalar variance exhibit power-law scaling. […] |
| Size: | 6 data points |
| Abstract: | In this dataset, we present grain size and XRF element data of Holocene floodplain and colluvial, Pleistocene loess and Triassic (Buntsandstein) samples from the catchment of the Weiße Elster River (Central Germany). The samples were taken during the DFG-funded project 'Imprints of rapid climate changes and human activity on Holocene hydro-sedimentary dynamics in Central Europe (loess-covered Weiße Elster model region)' [SU491/6-1, ET20/10-1, VE117/7-1, WE5518/1-1, ZI721/13-1] between 2017 - 2025, using open outcrops, hand augering (Pürckhauer) or drilling with an Atlas Copco Cobra Pro hammer. The goal of this study was to obtain sediment provenance for Holocene overbank sediments in the middle Weiße Elster floodplain. |
| Size: | 24816 data points |
| Abstract: | The saturation status of calcium carbonate forms was calculated as part of the CDRmare RETAKE project effort to assess potentials and impacts for using alkalinity enhancement to enhance the capture of atmospheric carbon dioxide (CO2). Therefore, this data set is a compilation of carbonate system parameters measured during the monitoring cruises of the Leibniz Institute for Baltic Sea Research Warnemünde (IOW) in the Baltic Sea from 2003 to 2023. Ancillary data was retrieved using the IOW's ODIN2 data tool accordingly. The following permanent link allows one to search and extract the data using our settings: http://hfffhf7958331196b483fs0cc0woppfcqq6f6n.ffgi.hlju.cwkeji.cn/957-0489-676. We paired the carbonate and ancillary (nutrient and hydrogen sulfide, H2S, data) data by selecting the respective cruise, station, timestamp, and depth. […] |
| Size: | 85285 data points |
| Abstract: | This dataset presents palynological data obtained from the Monte San Nicola type section (Sicily, Italy, Mediterranean Basin), which hosts the Global Boundary Stratotype Section and Point (GSSP) for the base of the Quaternary. The data were collected within the framework of the informal GELSTRAT Working Group of the Subcommission on Quaternary Stratigraphy (SQS, International Commission on Stratigraphy, ICS). The palynological record spans a key interval in Earth's history corresponding to the intensification of Northern Hemisphere glaciation (ca. 2.7-2.5 Ma), encompassing the section where the GSSP for the base of the Quaternary is defined. Pollen grains and non-pollen palynomorphs were identified and counted following standard palynological procedures. The dataset includes concentration values for the main pollen taxa and ecological groups, as well as for non-pollen palynomorphs. […] |
| Size: | 4758 data points |
| Abstract: | This dataset presents palynological data obtained from the Monte San Nicola type section (Mediterranean Basin, Italy, Sicily), which hosts the Global boundary Stratotype Section and Point (GSSP) for the base of the Quaternary. The data were collected within the framework of the informal GELSTRAT working group of the Subcommission on Quaternary Stratigraphy (SQS, ICS). The pollen record spans a key interval in Earth's history corresponding to the intensification of Northern Hemisphere glaciation (ca. 2.7-2.5 Ma) in the section where the Global boundary Stratotype Section and Point (GSSP) for the base of the Quaternary is defined. Pollen grains were identified and counted following standard palynological procedures. The dataset includes percentages for the identified taxa and ecological informal groups. […] |
| Size: | 6238 data points |