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Soil physicochemical properties of the PhytOakmeter plot FBOL_14 (Toulenne, France) in 2016, 2018 and 2022
No full textAs part of PhytOakmeter platform (www.phytoakmeter.de), soil chemical parameters were determined in 2016, 2018 and 2022. Soil pH was measured using a glass electrode in a 1:2.5 soil-to-0.01 M CaCl2 suspension after one hour of equilibration. Gravimetric soil moisture was assessed with a fully automated moisture analyzer (DBS60-3, KERN & SOHN GmbH, Balingen, Germany), here defined as soil moisture (MOI). Total nitrogen (TN) and total carbon (TC) contents in the soil were analyzed in triplicate through dry combustion using a Vario elemental analyzer (EL III, Elementar, Hanau, Germany), and the carbon-to-nitrogen ratio (TC/TN) was subsequently calculated from these values. To evaluate the potentially bioavailable soil organic carbon and nitrogen for microbial activity, hot water-extractable carbon and nitrogen (HWC and HWN, respectively) were determined following the methods of Ghani et al. (2003) and Schulz et al. (2011). Additionally, the labile organic carbon and nitrogen easily decomposable by soil microorganisms were measured as cold water-extractable carbon (CWC) and nitrogen (CWN) based on procedures described by Zsolnay (1996), Zakharova et al. (2015), and Schmidt et al. (2017). Ammonium and nitrate (NH4±N and NO3—N, respectively) were quantified, with their sum representing the total mineral nitrogen content (Nmin)
Elemental composition of deep pelagic fish and crustaceans sampled between 2002 and 2020 in temperate and subarctic Atlantic, and in western Mediterranean
No full textThe dataset contains 108 records of major and trace element concentrations measured on (eviscerated) whole bodies of meso- to bathypelagic fish (19 species), decapods (4 species) and euphausiids (1 species) collected around the Iberian Peninsula (temperate Atlantic and western Mediterranean), in the Bay of Biscay (temperate Atlantic), and in waters south of Iceland and in southern Irminger Sea (subarctic Atlantic). Samples around the Iberian Peninsula were collected on the CSIC-SUMMER cruise in October 2020 on R/V Sarmiento de Gamboa (Olivar et al. 2022). Samples from the Bay of Biscay were collected in autumn from 2002 to 2019, during the EVHOE fishery survey ("Evaluation Halieutique de l'Ouest de l'Europe"; https://doi.org/10.18142/8) conducted each year by the "Institut Français de Recherche pour l'Exploitation de la Mer" (Ifremer) on R/V Thalassa. Finally, samples from the subarctic Atlantic were collected in July 2020 during the IESSNS survey, icelandic part, on R/V (Ólafsdóttir and Pampoulie, 2021). For elemental analyses, aliquots of samples (~200 mg dry weight of homogenised specimens) were digested using a mixture of nitric and hydrochloric acids. Acidic digestion of the samples was performed overnight at room temperature and then in a microwave oven. Total concentrations of the micro-mineral phosphorus (P) and of the trace elements arsenic (As), cadmium (Cd), cobalt (Co), copper (Cu), iron (Fe), manganese (Mn), nickel (Ni), lead (Pb), selenium (Se) and zinc (Zn) were determined by inductively coupled plasma atomic emission spectrometry (ICP-OES) and/or mass spectrometry (ICP-MS). Total mercury (Hg) concentrations were also determined on aliquots of homogenised powder (50 ± 5 mg), by atomic absorption spectrophotometry using an Advanced Mercury Analyser. The quality assurance of these elemental analyses relied on blank and internal standard controls, and on the accuracy and reproducibility of data relative to the certified reference materials (CRMs) used in each analytical run. All elemental concentrations are given on a dry weight basis and can be converted on a wet weight basis according to the average percentages of moisture provided for each sample
Z-scores stacks of Pinus edulis pollen from seven sites in the Rocky Mountains
No full textThese are P. edulis pollen data from sedimentary records from seven sites located in alpine lakes from the Southern Rockies of North America. The records cover the last 11,000 cal yr BP and seem to show vegetation changes afecting P. edulis related with climate (ENSO) variability
Mineral composition from sediment core of Lake Alchichica in Mexico
No full textThe mineralogical data were measured 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. Forty freeze-dried ground samples weighing ~0.5 g were sieved through a 150 µm mesh and transferred to a plastic holder using the backside method and scanned from 2 to 70◦ 2θ with a step size of 0.009◦2θ and 0.5 s per step. The analysis was performed using a Bruker® D8-Advance Eco diffractometer (CuKα radiation, λ = 1.5418 Å, 40 kV, 25 mA) coupled with a Lynxeye XE detector (AGEs Laboratory, University of Liège). Mineral identification and quantification were done using the EVA (v4.3) and TOPAS (v5.0) ® Bruker software, respectively. A Rietveld refinement was applied to all the minerals identified by XRD. Unit cell parameters and preferred orientations of the mineral phases were adjusted to obtain a reconstructed XRD pattern as close to the measured pattern
BPCA-derived pyrogenic carbon, microscopic charcoal, and TOC in a sediment core from Lake EN21437 (Yakutia, Siberia)
No full textRecords of benzene polycarboxylic acids (BPCAs), microscopic charcoal, and organic carbon of sediment core EN21437-1 from Lake EN21437 in central Yakutia. This data was used for the reconstruction of fire dynamics (biomass burning, fire intensity) over the past c. 7600 years. BPCAs were prepared from freeze-dried, homogenized lake sediment samples by nitric acid oxidation and measured in a high-performance liquid chromatograph. They are reported here as the concentration of the complete BPCAs (µM), as relative data, and as concentration of pyrogenic carbon (mgC) per gram of dry sediment, based on the sum of B5CA and B6CA. Microscopic charcoal particles (<150 µm) were counted on pollen slides together with marker spores to establish charcoal particle concentrations reported here. Total organic carbon (TOC) was measured in dried and homogenized bulk sediment samples using a soliTOC cube analyzer. The sediment core was obtained during fieldwork in August 2021, jointly organized by the Alfred Wegener Institute and the North-Eastern Federal University of Yakutsk. More information about the data can be found in the corresponding research paper (Glückler et al., in preparation). A comprehensive description of fieldwork in 2021 is available in the corresponding expedition report (Morgenstern et al., 2023)
BPCA-derived pyrogenic carbon from lake surface sediments in Yakutia, Siberia
No full textRecords of benzene polycarboxylic acids (BPCAs) from lake surface sediments in central and eastern Yakutia. This data was used for the evaluation of fire dynamics (biomass burning, fire intensity). BPCAs were prepared from freeze-dried, homogenized lake sediment samples by nitric acid oxidation and measured in a high-performance liquid chromatograph. They are reported here as the concentration of the complete BPCAs (µM), as relative data, and as concentration of pyrogenic carbon (mgC) per gram of dry sediment, based on the sum of B5CA and B6CA. The surface sediments were obtained during fieldwork in August 2021, jointly organized by the Alfred Wegener Institute and the North-Eastern Federal University of Yakutsk. More information about the data can be found in the corresponding research paper (Glückler et al., in preparation). A comprehensive description of fieldwork in 2021 is available in the corresponding expedition report (Morgenstern et al., 2023)
2m, raw 20Hz data of wind, sonic temperature and humidity from a CSAT3+KH20 at EastGRIP site on Greenland Ice Sheet, summer 2019
No full textCSAT3+KH20 raw 20Hz data stored directly as measured by the instrument, in plain text .dat files. The CSAT3+KH20 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, Uy, Uz), sonic temperature in degrees Celsius (Ts), analogue output of humidity measured in V (KH20_raw). The humidity can be determined using the following constants: V0 = 3529 mV, x = 1.2 cm, kw = −0.2 and ko = −0.0450