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Pollen determination from sediment core of Lake Alchichica in Mexico
No full textThe pollen samples were collected from a 57-cm-long sediment core retrieved from Lake Alchichica (19° 24' 38 N, 97° 24' 14 W, 2322 masl) at a water depth of ~ 60 m using a Uwitec® coring device equipped with a 9-cm coring tube. A total of 39 wet sediment samples (1 cm³ each) were processed for pollen analysis at the Department of Geology, University of Liège, following standard acid digestion procedures. These included treatments with 10% HCl, 37% HF, acetolysis, and sieving through a 10 µm mesh. Pollen counts were performed at 400× magnification using a Zeiss microscope, with a minimum of 300 terrestrial pollen grains counted per sample
2m, raw 20Hz data of wind, sonic temperature and humidity from a CSAT3+Li-7500 at EastGRIP site on Greenland Ice Sheet, summer 2019
No full textCSAT3+Li-7500 raw 20Hz data stored directly as measured by the instrument, in plain text .dat files. The CSAT3+Li-7500 was installed at 2.15m facing the prevailing wind direction. Data columns correspond to: date and time (TIMESTAMP) u, y and z components of wind vector in m/s (Ux_mps,Uy_mps,Uz_mps), sonic temperature in degrees Celsius (T_sonic_gr_C), humidity in mmol/m3 (H2O_mmolpm3), and diagnostic flags for sonic wind and gas analyser (Diag_vind, Diag_gass)
Leaf SPAD and Chlorophyll content of native and non-native temperate deciduous shrubs 2018-2025
No full textDuring the autumn senescence period in years 2018, 2019, 2020, 2021, 2023 and 2024 we used a chlorophyll meter (Konica-Minolta, Japan, SPAD-502) to collect SPAD values from 5 replicate leaves of 5 native (Ribes americanum Wild currant; Prunus virginiana Chokecherry; Euonymus atropurpureus Eastern wahoo or Burning bush (added in 2020); Viburnum lentago Nannyberry; Cornus alternifolia Pagoda dogwood; ) and 4 non-native (Lonicera morrowii Honeysuckle; Rhamnus cathartica Common Buckthorn; Ligustrum vulgare European privet; Viburnum opulus European highbush cranberry) temperate deciduous shrub species growing in Downer Woods - a small urban woodlot on the campus of the University of Wisconsin-Milwaukee, USA. SPAD values were recorded at least twice weekly on all species when leaves were present. On each occasion SPAD readings were recorded at the same location on each of five leaves from 2 to 7 replicate plants of each species. SPAD values were converted to leaf chlorophyll using calibration equations from a previous study (Donnelly et al. 2020, doi:10.1007/s13595-020-00940-6)
Diatom species composition of sediment core PS69/899-2
No full textDiatom species composition from sediment cores PS69/899-2, located in the Indian sector of the Southern Ocean, covering the past 150,000 years, based on the age model described in Fripiat et al. (doi:10.1594/PANGAEA.983936)
TEX86-based sea surface temperature reconstruction for sediment core PS69/899-2
No full textTEX86-based sea surface temperature reconstruction from sediment cores PS69/899-2, located in the Indian sector of the Southern Ocean, covering the past 150,000 years, based on the age model described in Fripiat et al. (doi:10.1594/PANGAEA.983936)
Relative paleointensity (RPI) of the Earth's magnetic field of sediment core PS69/899-2
No full textRelative paleointensity (RPI) of the Earth's magnetic field from sediment cores PS69/899-2, located in the Indian sector of the Southern Ocean, covering the past 150,000 years, based on the age model described in Fripiat et al. (doi:10.1594/PANGAEA.983936)
Age model of sediment core PS75/054-1
No full textAge model of PS75/054-1 21 – 66 ka BP. Model is based on correlating XRF scan derived elemental ratios and counts to δ18O and dust content of EDC (AICC2023) and correlation of paleomagnetic measurements to the Black Sea core stack of Liu et al. (2020)
Age-depth model and stratigraphic tie points of sediment core PS69/899-2
No full textThe age model for PS69/899-2 was developed using a combination of stratigraphic markers and Undatable age-depth modeling routine (Lougheed and Obrochta, 2019). Stratigraphic markers employed include TEX86-based SST (doi:10.1594/PANGAEA.983930), RPI (doi:10.1594/PANGAEA.983936), radiocarbon ages on total sedimentary organic matter, and the last occurence datum of the diatom Rouxia leventerae (Zielinski et al., 2002). The TEX86-based SST record from core PS69/899-2 was aligned with the Antarctic temperature stack compiled from ice core data (Parrenin et al., 2013), while the RPI record was aligned with the PISO-1500 paleointensity stack (Channell et al., 2009). Radiocarbon ages were calibrated using the Marine 20 calibration data (Heaton et al., 2023), assuming a marine reservoir age of 1200 years for the Holocene and of 2200 years for glacial periods (Rafter et al., 2022)
Foraminiferal stable carbon isotope ratios (δ¹³C) at IODP Site 383-U1540 during Marine Isotope Stage 11
No full textThis dataset presents stable carbon isotope data measured on the epibenthic foraminifera Cibicidoides wuellerstorfi and Cibicides kullenbergi and the planktic foraminifera Globigerina bulloides at International Ocean Discovery Program Site 383-U1540 (55° 8.47ʹ S, 114° 50.52ʹ W, 3580 m) during Marine Isotope Stage 11. The results are expressed in delta-notation (δ¹³C) with reference to the Vienna Pee Dee Belemnite (VPDB) standard. Full replicates were conducted to determine the 1σ-uncertainty of the analyses. The samples were measured with a Thermo Fisher Scientific MAT 253 isotope ratio mass spectrometer coupled to a Kiel IV carbonate preparation device at the Leibniz Laboratory for Radiometric Dating and Stable Isotope Research at Kiel University (Kiel, Germany)