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BPCA-derived pyrogenic carbon, microscopic charcoal, and TOC in a sediment core from Lake EN21402 (Yakutia, Siberia)
No full textRecords of benzene polycarboxylic acids (BPCAs), microscopic charcoal, and organic carbon of sediment core EN21402-4 from Lake EN21402 in eastern Yakutia. This data was used for the reconstruction of fire dynamics (biomass burning, fire intensity) over the past c. 5000 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)
Terrestrial laser scanning point cloud for ten glaciers in High Mountain Asia from 2017 to 2018
No full textWe used the Riegl VZ-6000 terrestrial laser scanning to perform annual geodetic surveys at 2-4 scan positions situated in the stable terrain area. The GNSS was used to survey three-dimensional coordinates for these scan positions with the system of WGS84 datum and we then produced dense point clouds of the investigated glacier surfaces using RiSCAN PRO® v 2.14.1.The procedures for point cloud processing included direct georeferencing, data registration, data compression, data filtering and interpolation. The processed layers in 2017 were considered as the reference, and the co-registration of the two consecutive layers for the ten glaciers was finished by using the iterative closest point algorithms via RiSCAN PRO® v 2.14.1
Biogeochemistry of suspended particulate matter of surface waters from the nearshore zone of Herschel Island, Canada
No full textA new helium isotope recored of the Paleocene-Eocene Thermal Maximum from ODP Site 198-1209 (S1)
No full textThe Paleocene-Eocene Thermal Maximum (PETM; around 56 Ma ago) is arguably the most intensively studied event of rapid greenhouse warming of the geological past. The duration and age of the PETM, however, remains vividly debated, limiting our understanding of the response of the Earth System dynamics to rapid warming. Here we present new extraterrestrial helium 3 (3HeET) data across the PETM at ODP Site 198-1209 (N Pacific) that document a drop in 3HeET fluxes from 0.56 ± 0.02 pcm³/cm²/ka ~1 Ma prior to the PETM to values of 0.37 ± 0.02 pcm³/cm²/ka before and after the PETM. Our 3HeET-based chronology, optimized through spectral analysis and orbital tuning, indicates a duration of 160±10 ka for the PETM body/core, consistent with previous 3HeET estimates from ODP Site 208-1266 (Walvis Ridge). The PETM started at the onset of a 100 ka eccentricity maxima at 56080 ka BP and ended abruptly during a marked decline in eccentricity at 55883 ka, providing strong support for an orbital trigger of both its onset and termination. The reevaluation of the 3HeET age models of the high paleo-latitude ODP Site 113-690 shows that the prominent sedimentary and carbon isotope steps at this site were controlled by obliquity instead of precession. Our revised chronology suggests that obliquity was also the dominant driver of the repeated drops to lower δ13C values during the PETM in otherwise precession-dominated low latitude sites, possibly reflecting the repeated destabilization of methane hydrate or permafrost carbon stocks at high latitudes.
This dataset contains the grayscale reflectance logs obtained on core photographs for ODP Site 198-1209A, B and C, new records of helium isotope and non-carbonate fraction data for ODP Site 198-1209 and the reconstructed apparent 3HeET fluxes (FET), instantaneous sedimentation rates (ISR) and ages. We also report new bulk carbonate carbon and oxygen stable isotope data for ODP Site 198-1209 that are included in a compilation of published bulk carbonate data from the same site along with their corresponding 3HeET ages. We include a compilation of published benthic foraminifera carbon and oxygen stable isotope data for ODP Site 198-1209 with their corresponding 3HeET ages. We also report a compilation of Fe and Ca concentrations, stable isotope data measured on bulk sediment, planktonic and benthic foraminifera from ODP Site 113-690 that are reported against a revised 3HeET-based age model we developed for this site using published 3HeET data and a revised 3HeET flux of 0.42 ± 0.02 pcm³/cm²/ka and an age of 55916 ka BP for point F (169.05 mbsf)
Porewater chemistry from site NB8 in the Ore Estuary (Bothnian Sea)
No full textPorewater depth profiles of ammonium, nitrate, sulfate, sulfide, dissolved iron, dissolved manganese, methane and oxygen; Solid phase depth profiles of total organic carbon, sequential iron and manganese extraction results of site NB8 in the Ore Estuary in the Bothnian Sea. (data published in doi:10.1021/acs.est.3c02023). Porewater ammonium and nitrate concentrations were determined colorimetrically using the indophenol-blue method and with a Gallery Automated Chemistry Analyzer type, respectively
