1,721,053 research outputs found
Secondary standards for major oxide concentrations of individual glass tephra shards from the Greenland ice core TUNU2013_58.04-58.14m, Summit2023_180.52-108.69m, and Summit2023_108.22-108.37m samples
No full textSecondary standards of Lipari, BCR-2Ga, ML3B-G, StHS6/80-G, and Old Crow for major element oxide tephra glass analyses obtained from individual glass shards from samples TUNU2013_58.04-58.14m, Summit2023_180.52-108.69m, and Summit2023_108.22-108.37m in the Greenland TUNU2013 [78.04°N/33.88°W] and Summit2023 [72.6°N/38.3°W] ice cores. Normalised analytical data (totals to 100%) and the original analytical totals are reported (before normalisation) all as weight %. Data was obtained using electron probe micro-analysis (EPMA) at the University of Bern, Switzerland and the University of St Andrews, UK
High-resolution records of sulfur and insoluble particle concentrations from the Summit2023 ice core in Greenland between 1666 and 1670 CE and inferred volcanic contributions
No full textWe report high resolution (2.5 cm depth) sulfur concentrations from the Summit2023 ice core in Greenland analyzed using inductively coupled plasma mass spectrometry (ICPMS) and mass concentrations of insoluble particles (5-10um size) using an inline Abakus® laser particle counter at the Desert Research Institute. Details about the analytical procedures are provided in the references. We subtract represenative background values from the total sulfur concentrations to derive volcanic sulfate concentrations (ng g-1). These records are used alongside ice-core crypto-tephra to characterize volcanic eruption sources and to disentangle individual volcanic sulfur depositions on the polar ice sheet arising from temporal clusters of volcanic eruptions in the 1660s CE
Monthly records of non-sea-salt sulfur from the NEEM-2011-S1 ice core in Greenland between 1530 and 1710 CE and inferred background and volcanic contributions
No full textWe report monthly non-sea-salt sulfur concentrations from the NEEM-2011-S1 ice core (Greenland) analyzed using inductively coupled plasma mass spectrometry (ICPMS) at the Desert Research Institute. Additional details about the ice-core site and analytical procedures are provided in the references below citing the original publications. From this monthly resolved record we infer a mean annual cycle of background sulfur concentrations using the median across the respective months in a volcanically quiescent time (1530-1580 CE) while omitting months influenced by smaller volcanic eruptions. We then subtract this mean background cycle from the total sulfur concentrations to derive volcanic sulfate coencentrations (ng g-1) at nominal monthly resolution. These records are used alongside ice-core crypto-tephra to characterize volcanic eruption sources and to disentangle individual volcanic sulfur depositions on the polar ice sheets arising from temporal clusters of volcanic eruptions such as in the 1590s, 1600s, 1640s, 1660s and 1690s CE
Monthly records of non-sea-salt sulfur from the WDC ice core in Antarctica between 1530 and 1710 CE and inferred background and volcanic contributions
No full textWe report monthly non-sea-salt sulfur concentrations from the WDC ice core (Antarctica) analyzed using inductively coupled plasma mass spectrometry (ICPMS) at the Desert Research Institute. Additional details about the ice-core site and analytical procedures are provided in the references below citing the original publications. From this monthly resolved record we infer a mean annual cycle of background sulfur concentrations using the median across the respective months in a volcanically quiescent time (1530-1580 CE) while omitting months influenced by smaller volcanic eruptions. We then subtract this mean background cycle from the total sulfur concentrations to derive volcanic sulfate depositions rates (kg km-2 month-1) at nominal monthly resolution. These records are used alongside ice-core crypto-tephra to characterize volcanic eruption sources and to disentangle individual volcanic sulfur depositions on the polar ice sheets arising from temporal clusters of volcanic eruptions such as in the 1590s, 1600s, 1640s, 1660s and 1690s CE
Major oxide concentrations of individual glass tephra shards from the Greenland ice core TUNU2013_58.04-58.14m, Summit2023_180.52-108.69m, and Summit2023_108.22-108.37m samples
No full textMajor oxide concentrations of individual glass tephra shards from tephra deposits in the Greenland TUNU2013 [78.04°N/33.88°W] and Summit2023 [72.6°N/38.3°W] ice cores. Deposits analysed are (i) TUNU2013_58.04-58.14m, (ii) Summit2023_180.52-108.69m, and (iii) Summit2023_108.22-108.37m. Normalised analytical data (totals to 100%) and the original analytical totals are reported (before normalisation) all as weight %. Data was obtained using electron probe micro-analysis (EPMA) at the University of Bern, Switzerland and the University of St Andrews, UK. Sample ID, sample depth (m), sample age (Year CE), tephra name (if known), source volcano, and normalised oxide values are provided
High-resolution records of sulfur and insoluble particle concentrations from the TUNU2013 ice core in Greenland between 1530 and 1710 CE
No full textWe report high resolution (1 cm depth) sulfur concentrations from the B19 ice core in Greenland analyzed using inductively coupled plasma mass spectrometry (ICPMS) and mass concentrations of insoluble particles (5-10um size) using an inline Abakus® laser particle counter at the Desert Research Institute. Details about the analytical procedures are provided in the references. These records are used alongside ice-core crypto-tephra to characterize volcanic eruption sources in the 1660s CE
High time resolution records of sulfur and insoluble particle concentrations from five ice cores from Greenland and one from Antarctica between 1530 and 1710 CE and inferred volcanic contributions
No full textWe report high time resolution (i.e. close to monthly) non-sea-salt sulfur concentrations from six ice cores including WDC (Antarctica) and Summit2015, Summit2023, NEEM-2011-S1, TUNU2013, and B19 (Greenland) analyzed using inductively coupled plasma mass spectrometry (ICPMS) at the Desert Research Institute. For Summit 2015, Summit 2023, B19 and TUNU2013 we also provide mass concentration records of insoluble particles (5-10 μm) using an inline Abakus® laser particle counter. Additional details about the ice-core sites and analytical procedures are provided in the Supporting Data of Gabriel et al., (2025) and in the references below citing the original publications. From three monthly resolved records (WDC, Summit15, NEEM-2011-S1) we infer a mean annual cycle of background sulfur concentrations using the median across the same months in a volcanically quiescent time (1530-1580 CE) while omitting months influenced by smaller volcanic eruptions. We then subtract this mean background cycle from the total sulfur concentrations to derive volcanic sulfur concentrations (ng/g) and volcanic sulfate depositions rates (kg km-2 month-1) at nominal monthly resolution. These records are used alongside ice-core crypto-tephra to characterize volcanic eruption sources and to disentangle individual volcanic sulfur depositions on the polar ice sheets arising from temporal clusters of volcanic eruptions such as in the 1590s, 1600s, 1640s, 1660s and 1690s CE
Monthly records of non-sea-salt sulfur from the Summit2015 ice core in Greenland between 1530 and 1710 CE and inferred background and volcanic contributions
No full textWe report monthly non-sea-salt sulfur concentrations from the Summit2015 ice core (Greenland) analyzed using inductively coupled plasma mass spectrometry (ICPMS) and mass concentration records of insoluble particles (size range 5-10um) using an inline Abakus® laser particle counter at the Desert Research Institute. Details about the analytical procedures are provided in the references. From the monthly resolved non-sea-salt sulfur concentration record we infer a mean annual cycle of background sulfur concentrations using the median across the respective months in a volcanically quiescent time (1530-1580 CE) while omitting months influenced by smaller volcanic eruptions. We then subtract this mean background cycle from the total sulfur concentrations to derive volcanic sulfate concentrations (ng g-1) and volcanic sulfate depositions rates (kg km-2 month-1) at nominal monthly resolution. These records are used alongside ice-core crypto-tephra to characterize volcanic eruption sources and to disentangle individual volcanic sulfur depositions on the polar ice sheets arising from temporal clusters of volcanic eruptions such as in the 1590s, 1600s, 1640s, 1660s and 1690s CE
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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