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  • American Chemical Society  (18)
  • Springer Nature  (16)
  • PANGAEA  (7)
  • 2015-2019  (41)
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  • 1
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    PANGAEA
    In:  Supplement to: Freud, Eyal; Krejci, Radovan; Tunved, Peter; Leaitch, W Richard; Nguyen, Quynh T; Massling, Andreas; Skov, Henrik; Barrie, Leonard (2017): Pan-Arctic aerosol number size distributions: seasonality and transport patterns. Atmospheric Chemistry and Physics, 17(13), 8101-8128, https://doi.org/10.5194/acp-17-8101-2017
    Publication Date: 2023-01-13
    Description: The Arctic environment has an amplified response to global climatic change. It is sensitive to human activities that mostly take place elsewhere. For this study, a multi-year set of observed aerosol number size distributions in the diameter range of 10 to 500 nm from five sites around the Arctic Ocean (Alert, Villum Research Station - Station Nord, Zeppelin, Tiksi and Barrow) was assembled and analysed. A cluster analysis of the aerosol number size distributions, revealed four distinct distributions. Together with Lagrangian air parcel back-trajectories, they were used to link the observed aerosol number size distributions with a variety of transport regimes. This analysis yields insight into aerosol dynamics, transport and removal processes, on both an intra- and inter-monthly scales. For instance, the relative occurrence of aerosol number size distributions that indicate new particle formation (NPF) event is near zero during the dark months, and increases gradually to ~ 40 % from spring to summer, and then collapses in autumn. Also, the likelihood of Arctic Haze aerosols is minimal in summer and peaks in April at all sites. The residence time of accumulation-mode particles in the Arctic troposphere is typically long enough to allow tracking them back to their source regions. Air flow that passes at low altitude over central Siberia and Western Russia is associated with relatively high concentrations of accumulation-mode particles (Nacc) at all five sites - often above 150/cm**3. There are also indications of air descending into the Arctic boundary layer after transport from lower latitudes. The analysis of the back-trajectories together with the meteorological fields along them indicates that the main driver of the Arctic annual cycle of Nacc, on the larger scale, is when atmospheric transport covers the source regions for these particles in the 10-day period preceding the observations in the Arctic. The scavenging of these particles by precipitation is shown to be important on a regional scale and it is most active in summer. Cloud processing is an additional factor that enhances the Nacc annual cycle. There are some consistent differences between the sites that are beyond the year-to-year variability. They are the result of differences in the proximity to the aerosol source regions and to the Arctic Ocean sea-ice edge, as well as in the exposure to free tropospheric air and in precipitation patterns - to mention a few. Hence, for most purposes, aerosol observations from a single Arctic site cannot represent the entire Arctic region. Therefore, the results presented here are a powerful observational benchmark for evaluation of detailed climate and air chemistry modelling studies of aerosols throughout the vast Arctic region.
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 2
    Publication Date: 2023-01-13
    Keywords: Aerosol number concentration; Air chemistry observatory; DATE/TIME; Log-normal particle size distribution, normalized concentration at particle diameter 100.24 nm; Log-normal particle size distribution, normalized concentration at particle diameter 112.47 nm; Log-normal particle size distribution, normalized concentration at particle diameter 126.19 nm; Log-normal particle size distribution, normalized concentration at particle diameter 141.59 nm; Log-normal particle size distribution, normalized concentration at particle diameter 158.87 nm; Log-normal particle size distribution, normalized concentration at particle diameter 178.25 nm; Log-normal particle size distribution, normalized concentration at particle diameter 200 nm; Log-normal particle size distribution, normalized concentration at particle diameter 20 nm; Log-normal particle size distribution, normalized concentration at particle diameter 22.44 nm; Log-normal particle size distribution, normalized concentration at particle diameter 224.4 nm; Log-normal particle size distribution, normalized concentration at particle diameter 25.179 nm; Log-normal particle size distribution, normalized concentration at particle diameter 251.79 nm; Log-normal particle size distribution, normalized concentration at particle diameter 28.251 nm; Log-normal particle size distribution, normalized concentration at particle diameter 282.51 nm; Log-normal particle size distribution, normalized concentration at particle diameter 31.698 nm; Log-normal particle size distribution, normalized concentration at particle diameter 316.98 nm; Log-normal particle size distribution, normalized concentration at particle diameter 35.566 nm; Log-normal particle size distribution, normalized concentration at particle diameter 355.66 nm; Log-normal particle size distribution, normalized concentration at particle diameter 39.905 nm; Log-normal particle size distribution, normalized concentration at particle diameter 399.05 nm; Log-normal particle size distribution, normalized concentration at particle diameter 44.774 nm; Log-normal particle size distribution, normalized concentration at particle diameter 447.74 nm; Log-normal particle size distribution, normalized concentration at particle diameter 50.238 nm; Log-normal particle size distribution, normalized concentration at particle diameter 502.38 nm; Log-normal particle size distribution, normalized concentration at particle diameter 56.368 nm; Log-normal particle size distribution, normalized concentration at particle diameter 63.246 nm; Log-normal particle size distribution, normalized concentration at particle diameter 70.963 nm; Log-normal particle size distribution, normalized concentration at particle diameter 79.621 nm; Log-normal particle size distribution, normalized concentration at particle diameter 89.337 nm; Mountain Air Monitoring Station; Ny-Ålesund, Spitsbergen; SPUSO; Zeppelin
    Type: Dataset
    Format: text/tab-separated-values, 841244 data points
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  • 3
    Publication Date: 2023-01-13
    Keywords: Aerosol number concentration; Air chemistry observatory; Barrow; DATE/TIME; Log-normal particle size distribution, normalized concentration at particle diameter 100.24 nm; Log-normal particle size distribution, normalized concentration at particle diameter 112.47 nm; Log-normal particle size distribution, normalized concentration at particle diameter 126.19 nm; Log-normal particle size distribution, normalized concentration at particle diameter 141.59 nm; Log-normal particle size distribution, normalized concentration at particle diameter 158.87 nm; Log-normal particle size distribution, normalized concentration at particle diameter 178.25 nm; Log-normal particle size distribution, normalized concentration at particle diameter 200 nm; Log-normal particle size distribution, normalized concentration at particle diameter 20 nm; Log-normal particle size distribution, normalized concentration at particle diameter 22.44 nm; Log-normal particle size distribution, normalized concentration at particle diameter 224.4 nm; Log-normal particle size distribution, normalized concentration at particle diameter 25.179 nm; Log-normal particle size distribution, normalized concentration at particle diameter 251.79 nm; Log-normal particle size distribution, normalized concentration at particle diameter 28.251 nm; Log-normal particle size distribution, normalized concentration at particle diameter 282.51 nm; Log-normal particle size distribution, normalized concentration at particle diameter 31.698 nm; Log-normal particle size distribution, normalized concentration at particle diameter 316.98 nm; Log-normal particle size distribution, normalized concentration at particle diameter 35.566 nm; Log-normal particle size distribution, normalized concentration at particle diameter 355.66 nm; Log-normal particle size distribution, normalized concentration at particle diameter 39.905 nm; Log-normal particle size distribution, normalized concentration at particle diameter 399.05 nm; Log-normal particle size distribution, normalized concentration at particle diameter 44.774 nm; Log-normal particle size distribution, normalized concentration at particle diameter 447.74 nm; Log-normal particle size distribution, normalized concentration at particle diameter 50.238 nm; Log-normal particle size distribution, normalized concentration at particle diameter 502.38 nm; Log-normal particle size distribution, normalized concentration at particle diameter 56.368 nm; Log-normal particle size distribution, normalized concentration at particle diameter 63.246 nm; Log-normal particle size distribution, normalized concentration at particle diameter 70.963 nm; Log-normal particle size distribution, normalized concentration at particle diameter 79.621 nm; Log-normal particle size distribution, normalized concentration at particle diameter 89.337 nm; SPUSO; United States of America
    Type: Dataset
    Format: text/tab-separated-values, 316920 data points
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  • 4
    Publication Date: 2023-01-13
    Keywords: Aerosol number concentration; DATE/TIME; Log-normal particle size distribution, normalized concentration at particle diameter 100.24 nm; Log-normal particle size distribution, normalized concentration at particle diameter 112.47 nm; Log-normal particle size distribution, normalized concentration at particle diameter 126.19 nm; Log-normal particle size distribution, normalized concentration at particle diameter 141.59 nm; Log-normal particle size distribution, normalized concentration at particle diameter 158.87 nm; Log-normal particle size distribution, normalized concentration at particle diameter 178.25 nm; Log-normal particle size distribution, normalized concentration at particle diameter 200 nm; Log-normal particle size distribution, normalized concentration at particle diameter 20 nm; Log-normal particle size distribution, normalized concentration at particle diameter 22.44 nm; Log-normal particle size distribution, normalized concentration at particle diameter 224.4 nm; Log-normal particle size distribution, normalized concentration at particle diameter 25.179 nm; Log-normal particle size distribution, normalized concentration at particle diameter 251.79 nm; Log-normal particle size distribution, normalized concentration at particle diameter 28.251 nm; Log-normal particle size distribution, normalized concentration at particle diameter 282.51 nm; Log-normal particle size distribution, normalized concentration at particle diameter 31.698 nm; Log-normal particle size distribution, normalized concentration at particle diameter 316.98 nm; Log-normal particle size distribution, normalized concentration at particle diameter 35.566 nm; Log-normal particle size distribution, normalized concentration at particle diameter 355.66 nm; Log-normal particle size distribution, normalized concentration at particle diameter 39.905 nm; Log-normal particle size distribution, normalized concentration at particle diameter 399.05 nm; Log-normal particle size distribution, normalized concentration at particle diameter 44.774 nm; Log-normal particle size distribution, normalized concentration at particle diameter 447.74 nm; Log-normal particle size distribution, normalized concentration at particle diameter 50.238 nm; Log-normal particle size distribution, normalized concentration at particle diameter 502.38 nm; Log-normal particle size distribution, normalized concentration at particle diameter 56.368 nm; Log-normal particle size distribution, normalized concentration at particle diameter 63.246 nm; Log-normal particle size distribution, normalized concentration at particle diameter 70.963 nm; Log-normal particle size distribution, normalized concentration at particle diameter 79.621 nm; Log-normal particle size distribution, normalized concentration at particle diameter 89.337 nm; OBSE; Observation; Tiksi
    Type: Dataset
    Format: text/tab-separated-values, 318210 data points
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  • 5
    Publication Date: 2023-01-13
    Keywords: Aerosol number concentration; Air chemistry observatory; DATE/TIME; Log-normal particle size distribution, normalized concentration at particle diameter 100.24 nm; Log-normal particle size distribution, normalized concentration at particle diameter 112.47 nm; Log-normal particle size distribution, normalized concentration at particle diameter 126.19 nm; Log-normal particle size distribution, normalized concentration at particle diameter 141.59 nm; Log-normal particle size distribution, normalized concentration at particle diameter 158.87 nm; Log-normal particle size distribution, normalized concentration at particle diameter 178.25 nm; Log-normal particle size distribution, normalized concentration at particle diameter 200 nm; Log-normal particle size distribution, normalized concentration at particle diameter 20 nm; Log-normal particle size distribution, normalized concentration at particle diameter 22.44 nm; Log-normal particle size distribution, normalized concentration at particle diameter 224.4 nm; Log-normal particle size distribution, normalized concentration at particle diameter 25.179 nm; Log-normal particle size distribution, normalized concentration at particle diameter 251.79 nm; Log-normal particle size distribution, normalized concentration at particle diameter 28.251 nm; Log-normal particle size distribution, normalized concentration at particle diameter 282.51 nm; Log-normal particle size distribution, normalized concentration at particle diameter 31.698 nm; Log-normal particle size distribution, normalized concentration at particle diameter 316.98 nm; Log-normal particle size distribution, normalized concentration at particle diameter 35.566 nm; Log-normal particle size distribution, normalized concentration at particle diameter 355.66 nm; Log-normal particle size distribution, normalized concentration at particle diameter 39.905 nm; Log-normal particle size distribution, normalized concentration at particle diameter 399.05 nm; Log-normal particle size distribution, normalized concentration at particle diameter 44.774 nm; Log-normal particle size distribution, normalized concentration at particle diameter 447.74 nm; Log-normal particle size distribution, normalized concentration at particle diameter 50.238 nm; Log-normal particle size distribution, normalized concentration at particle diameter 502.38 nm; Log-normal particle size distribution, normalized concentration at particle diameter 56.368 nm; Log-normal particle size distribution, normalized concentration at particle diameter 63.246 nm; Log-normal particle size distribution, normalized concentration at particle diameter 70.963 nm; Log-normal particle size distribution, normalized concentration at particle diameter 79.621 nm; Log-normal particle size distribution, normalized concentration at particle diameter 89.337 nm; North Greenland; SPUSO; Station_Nord; Villum Research Station
    Type: Dataset
    Format: text/tab-separated-values, 588750 data points
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  • 6
    Publication Date: 2023-06-27
    Keywords: Aerosol number concentration; Alert; Canadian Arctic Station; DATE/TIME; Joint Arctic Weather Stations; Log-normal particle size distribution, normalized concentration at particle diameter 100.24 nm; Log-normal particle size distribution, normalized concentration at particle diameter 112.47 nm; Log-normal particle size distribution, normalized concentration at particle diameter 126.19 nm; Log-normal particle size distribution, normalized concentration at particle diameter 141.59 nm; Log-normal particle size distribution, normalized concentration at particle diameter 158.87 nm; Log-normal particle size distribution, normalized concentration at particle diameter 178.25 nm; Log-normal particle size distribution, normalized concentration at particle diameter 200 nm; Log-normal particle size distribution, normalized concentration at particle diameter 20 nm; Log-normal particle size distribution, normalized concentration at particle diameter 22.44 nm; Log-normal particle size distribution, normalized concentration at particle diameter 224.4 nm; Log-normal particle size distribution, normalized concentration at particle diameter 25.179 nm; Log-normal particle size distribution, normalized concentration at particle diameter 251.79 nm; Log-normal particle size distribution, normalized concentration at particle diameter 28.251 nm; Log-normal particle size distribution, normalized concentration at particle diameter 282.51 nm; Log-normal particle size distribution, normalized concentration at particle diameter 31.698 nm; Log-normal particle size distribution, normalized concentration at particle diameter 316.98 nm; Log-normal particle size distribution, normalized concentration at particle diameter 35.566 nm; Log-normal particle size distribution, normalized concentration at particle diameter 355.66 nm; Log-normal particle size distribution, normalized concentration at particle diameter 39.905 nm; Log-normal particle size distribution, normalized concentration at particle diameter 399.05 nm; Log-normal particle size distribution, normalized concentration at particle diameter 44.774 nm; Log-normal particle size distribution, normalized concentration at particle diameter 447.74 nm; Log-normal particle size distribution, normalized concentration at particle diameter 50.238 nm; Log-normal particle size distribution, normalized concentration at particle diameter 502.38 nm; Log-normal particle size distribution, normalized concentration at particle diameter 56.368 nm; Log-normal particle size distribution, normalized concentration at particle diameter 63.246 nm; Log-normal particle size distribution, normalized concentration at particle diameter 70.963 nm; Log-normal particle size distribution, normalized concentration at particle diameter 79.621 nm; Log-normal particle size distribution, normalized concentration at particle diameter 89.337 nm; OBSE; Observation; Queen Elizabeth Islands, Canada NWT
    Type: Dataset
    Format: text/tab-separated-values, 612000 data points
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  • 7
    Publication Date: 2024-04-20
    Description: Publically available paleontological data collected for calcareous nannofossils, foraminifers and radiolarians from industry wells drilled in the Deepwater Gulf of Mexico are used to confirm geologic age and interpret oceanographic conditions and depositional environment during the Paleocene-Eocene Thermal Maximum (PETM).
    Keywords: Calcareous nannofossils; foraminifers; Gulf of Mexico; Gulf-of-Mexico; MULT; Multiple investigations; Paleocene-Eocene Thermal Maximum; Radiolarians
    Type: Dataset
    Format: application/zip, 585.8 kBytes
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  • 8
    Publication Date: 2015-02-03
    Description: We studied links between human malnutrition and wild meat availability within the Rainforest Biotic Zone in central Africa. We distinguished two distinct hunted mammalian diversity distributions, one in the rainforest areas (Deep Rainforest Diversity, DRD) containing taxa of lower hunting sustainability, the other in the northern rainforest-savanna mosaic, with species of greater hunting potential (Marginal Rainforest Diversity, MRD). Wild meat availability, assessed by standing crop mammalian biomass, was greater in MRD than in DRD areas. Predicted bushmeat extraction was also higher in MRD areas. Despite this, stunting of children, a measure of human malnutrition, was greater in MRD areas. Structural equation modeling identified that, in MRD areas, mammal diversity fell away from urban areas, but proximity to these positively influenced higher stunting incidence. In DRD areas, remoteness and distance from dense human settlements and infrastructures explained lower stunting levels. Moreover, stunting was higher away from protected areas. Our results suggest that in MRD areas, forest wildlife rational use for better human nutrition is possible. By contrast, the relatively low human populations in DRD areas currently offer abundant opportunities for the continued protection of more vulnerable mammals and allow dietary needs of local populations to be met. Scientific Reports 5 doi: 10.1038/srep08168
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 9
    Publication Date: 2015-04-29
    Description: Organic aerosols are ubiquitous in the earth’s atmosphere. They have been extensively studied in urban, rural and marine environments. However, little is known about the fluorescence properties of water-soluble organic carbon (WSOC) or their transport to and distribution in the polar regions. Here, we present evidence that fluorescent WSOC is a substantial component of High Arctic aerosols. The ratios of fluorescence intensity of protein-like peak to humic-like peak generally increased from dark winter to early summer, indicating an enhanced contribution of protein-like organics from the ocean to Arctic aerosols after the polar sunrise. Such a seasonal pattern is in agreement with an increase of stable carbon isotope ratios of total carbon (δCTC) from −26.8‰ to −22.5‰. Our results suggest that Arctic aerosols are derived from a combination of the long-range transport of terrestrial organics and local sea-to-air emission of marine organics, with an estimated contribution from the latter of 8.7–77% (mean 45%). Scientific Reports 5 doi: 10.1038/srep09845
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 10
    Publication Date: 2017-06-27
    Description: An L -threonine transaldolase is required for L - threo -β-hydroxy-α-amino acid assembly during obafluorin biosynthesis Nature Communications, Published online: 26 June 2017; doi:10.1038/ncomms15935 Obafluorin is a β-lactone antibiotic produced by Pseudomonas fluorescens . Here the authors present the biosynthetic gene cluster and biosynthetic pathway of obafluorin, which is characterized by a central transaldolase step catalysed by a rare L -threonine transaldolase.
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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