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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: 2020-07-01
    Description: The U.S. Department of Energy Atmospheric Radiation Measurement (ARM) West Antarctic Radiation Experiment (AWARE) performed comprehensive meteorological and aerosol measurements and ground-based atmospheric remote sensing at two Antarctic stations using the most advanced instrumentation available. A suite of cloud research radars, lidars, spectral and broadband radiometers, aerosol chemical and microphysical sampling equipment, and meteorological instrumentation was deployed at McMurdo Station on Ross Island from December 2015 through December 2016. A smaller suite of radiometers and meteorological equipment, including radiosondes optimized for surface energy budget measurement, was deployed on the West Antarctic Ice Sheet between 4 December 2015 and 17 January 2016. AWARE provided Antarctic atmospheric data comparable to several well-instrumented high Arctic sites that have operated for many years and that reveal numerous contrasts with the Arctic in aerosol and cloud microphysical properties. These include persistent differences in liquid cloud occurrence, cloud height, and cloud thickness. Antarctic aerosol properties are also quite different from the Arctic in both seasonal cycle and composition, due to the continent’s isolation from lower latitudes by Southern Ocean storm tracks. Antarctic aerosol number and mass concentrations are not only non-negligible but perhaps play a more important role than previously recognized because of the higher sensitivities of clouds at the very low concentrations caused by the large-scale dynamical isolation. Antarctic aerosol chemical composition, particularly organic components, has implications for local cloud microphysics. The AWARE dataset, fully available online in the ARM Program data archive, offers numerous case studies for unique and rigorous evaluation of mixed-phase cloud parameterization in climate models.
    Print ISSN: 0003-0007
    Electronic ISSN: 1520-0477
    Topics: Geography , Physics
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  • 8
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  • 10
    Publication Date: 2020-09-10
    Description: Despite the potential importance of black carbon (BC) for radiative forcing of the Arctic atmosphere, vertically resolved measurements of the particle light scattering coefficient (σsp) and light absorption coefficient (σap) in the springtime Arctic atmosphere are infrequent, especially measurements at latitudes at or above 80∘ N. Here, relationships among vertically distributed aerosol optical properties (σap, σsp and single scattering albedo or SSA), particle microphysics and particle chemistry are examined for a region of the Canadian archipelago between 79.9 and 83.4∘ N from near the surface to 500 hPa. Airborne data collected during April 2015 are combined with ground-based observations from the observatory at Alert, Nunavut and simulations from the Goddard Earth Observing System (GEOS) model, GEOS-Chem, coupled with the TwO-Moment Aerosol Sectional (TOMAS) model (collectively GEOS-Chem–TOMAS; Kodros et al., 2018) to further our knowledge of the effects of BC on light absorption in the Arctic troposphere. The results are constrained for σsp less than 15 Mm−1, which represent 98 % of the observed σsp, because the single scattering albedo (SSA) has a tendency to be lower at lower σsp, resulting in a larger relative contribution to Arctic warming. At 18.4 m2 g−1, the average BC mass absorption coefficient (MAC) from the combined airborne and Alert observations is substantially higher than the two averaged modelled MAC values (13.6 and 9.1 m2 g−1) for two different internal mixing assumptions, the latter of which is based on previous observations. The higher observed MAC value may be explained by an underestimation of BC, the presence of small amounts of dust and/or possible differences in BC microphysics and morphologies between the observations and model. In comparing the observations and simulations, we present σap and SSA, as measured, and σap∕2 and the corresponding SSA to encompass the lower modelled MAC that is more consistent with accepted MAC values. Median values of the measured σap, rBC and the organic component of particles all increase by a factor of 1.8±0.1, going from near-surface to 750 hPa, and values higher than the surface persist to 600 hPa. Modelled BC, organics and σap agree with the near-surface measurements but do not reproduce the higher values observed between 900 and 600 hPa. The differences between modelled and observed optical properties follow the same trend as the differences between the modelled and observed concentrations of the carbonaceous components (black and organic). Model-observation discrepancies may be mostly due to the modelled ejection of biomass burning particles only into the boundary layer at the sources. For the assumption of the observed MAC value, the SSA range between 0.88 and 0.94, which is significantly lower than other recent estimates for the Arctic, in part reflecting the constraint of σsp
    Print ISSN: 1680-7316
    Electronic ISSN: 1680-7324
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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