1,721,149 research outputs found
Radiocarbon data of bulk organic matter in marine sediment core PS51/154-11 from the Laptev Sea, Arctic Ocean
No full textThis datasheet includes radiocarbon measurement results of bulk organic matter from core PS51/154-11. Sediments were freeze-dried, ground, and weighed into silver boats, with sample sizes determined by TOC content to target 1 mg of organic carbon. Samples were acidified with three drops of 6 M HCl at 60 °C three times with one hour reaction time between treatments, then oven-dried overnight at 60 °C. Afterwards, acidified samples together with silver boats were folded into tin boats and converted into graphite targets using an elemental analyzer (Elementar vario Isotope) coupled to an automated graphitization system (Ionplus AG, AGE-3). Radiocarbon measurements were conducted using the MIni CArbon Dating System (MICADAS) accelerator mass spectrometer at Alfred Wegener Institute (AWI) (Mollenhauer et al., 2021)
Dinoflagellate cyst counts of drifting trap surveys and In-situ pumps collected during Meteor cruise M165 in August 2020
No full textTo extend the understanding of dinoflagellate cysts production, excystment and vertical/ lateral transport in the water column, upper water dinoflagellate cyst export production have been compared with cysts associations and concentrations in the subsurface nepheloid layer, bottom nepheloid layer and deeper water column during active upwelling off Cape Blanc (NW Africa) in August 2020. Export production was collected by two drifting trap surveys; one in an active upwelling cell for 4 days and the other in an offshore drifting upwelling filament for 2 days. Subsurface and bottom nepheloid layers as well as the deeper waters were sampled by in-situ pumps along two transects perpendicular to the shelf break. The dataset represents the count data on species level of organic-walled dinoflagellate cysts in drifting trap and in-situ pump collected samples as well as information about the sampling time, sampling volume and collection surface
Radiocarbon data of bulk organic matter in marine surface sediments from the Laptev Sea, Arctic Ocean
No full textThis datasheet includes radiocarbon measurement results of bulk organic matter from marine surface sediments from the Laptev Sea. Sediments were freeze-dried, ground, and weighed into silver boats, with sample sizes determined by TOC content to target 1 mg of organic carbon. Samples were acidified with three drops of 6 M HCl at 60 °C three times with one hour reaction time between treatments, then oven-dried overnight at 60 °C. Afterwards, acidified samples together with silver boats were folded into tin boats and converted into graphite targets using an elemental analyzer (Elementar vario Isotope) coupled to an automated graphitization system (Ionplus AG, AGE-3). Radiocarbon measurements were conducted using the MIni CArbon Dating System (MICADAS) accelerator mass spectrometer at Alfred Wegener Institute (AWI) (Mollenhauer et al., 2021)
Radiocarbon data of bulk organic matter in marine sediment core PS51/159-10 from the Laptev Sea, Arctic Ocean
No full textThis datasheet includes radiocarbon measurement results of bulk organic matter from core PS51/159-10. Sediments were freeze-dried, ground, and weighed into silver boats, with sample sizes determined by TOC content to target 1 mg of organic carbon. Samples were acidified with three drops of 6 M HCl at 60 °C three times with one hour reaction time between treatments, then oven-dried overnight at 60 °C. Afterwards, acidified samples together with silver boats were folded into tin boats and converted into graphite targets using an elemental analyzer (Elementar vario Isotope) coupled to an automated graphitization system (Ionplus AG, AGE-3). Radiocarbon measurements were conducted using the MIni CArbon Dating System (MICADAS) accelerator mass spectrometer at Alfred Wegener Institute (AWI) (Mollenhauer et al., 2021)
Carbon isotope (¹³C and ¹⁴C) composition of bulk organic carbon in surface sediments retrieved from the Pearl River Estuary and northern South China Sea Shelf
No full textThis data set includes sampling information, δ¹³C, F¹⁴C, C/N ratio and content of bulk OC as well as grain size data in surface sediments collected by Gray box corer or grab sampler from the Pearl River Estuary and northern South China Sea Shelf. These data could help us (1) constrain sources of OC, (2) explore the role of hydrodynamic processes for terrigenous OC transport, and (3) better understand the burial and degradation processes of terrigenous OC in the coastal tropical sea
GDGTs from sediment core PS2458-4, Laptev Sea, Arctic Ocean
No full textThese data have been obtained from core PS2458-4 (78°10.0'N, 133°23.9'E; 983 m). The core was retrieved in 1993 from the eastern Laptev Sea continental margin. The dataset contains biomarkers concentrations (GDGTs)
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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