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Datasets of project "Atmospheric Chemistry @ AWI"

Mostrando recursos 1 - 20 de 60

  1. Airchemistry at Neumayer station, Antarctica during the year 2013

    Weller, Rolf

  2. Continuously measured 222Rn activity concentrations (daily means) in near surface air at Neumayer Station in the period 1995 through 2011

    Weller, Rolf; Levin, Ingeborg; Schmithüsen, Dominik; Nachbar, Mario; Asseng, Jölund; Wagenbach, Dietmar
    We report on continuously measured 222Rn activity concentrations in near-surface air at Neumayer Station in the period 1995-2011. This 17-year record showed no long-term trend and has overall mean ± standard deviation of (0.019 ± 0.012) Bq/m**3. A distinct and persistent seasonality could be distinguished with maximum values of (0.028 ± 0.013) Bq/m**3 from January to March and minimum values of (0.015 ± 0.009) Bq/m**3 from May to October. Elevated 222Rn activity concentrations were typically associated with air mass transport from the Antarctic Plateau. Our results do not support a relation between enhanced 222Rn activity concentrations at Neumayer and cyclonic...

  3. Airchemistry at Neumayer station, Antarctica during the year 2012

    Weller, Rolf

  4. Time series of black carbon aerosol measurements from Neumayer Station, 1999-2011

    Weller, Rolf; Minikin, Andreas; Petzold, Andreas; Wagenbach, Dietmar; König-Langlo, Gert
    Continuous black carbon (BC) observations were conducted from 1999 through 2009 by an Aethalometer (AE10) and from 2006 through 2011 by a Multi-Angle Absorption Photometer (MAAP) at Neumayer Station (NM) under stringent contamination control. Considering the respective observation period, BC concentrations measured by the MAAP were somewhat higher (median ± standard deviation: 2.1 ± 2.0 ng/m**3) compared to the AE10 results (1.6 ± 2.1 ng/m**3). Neither for the AE10 nor for the MAAP data set a significant long-term trend could be detected. Consistently a pronounced seasonality was observed with both instruments showing a primary annual maximum between October and November...

  5. Ionic composition of snow from snow pit SP_NMsued110121 excavated near Neumayer Station

    Weller, Rolf

  6. Ionic composition of snow from snow pit SP_NMsued100113 excavated near Neumayer Station

    Weller, Rolf

  7. Ionic composition of snow from snow pit SP_NMsued090106 excavated near Neumayer Station

    Weller, Rolf

  8. Ionic composition of snow from snow pit SP_NMsued080131 excavated near Neumayer Station

    Weller, Rolf

  9. Ionic composition of snow from snow pit SP_NMsued061223 excavated near Neumayer Station

    Weller, Rolf

  10. Ionic composition of snow from snow pit SP_NMsued051231 excavated near Neumayer Station

    Weller, Rolf

  11. Ionic composition of snow from snow pit SP_NMsued041221 excavated near Neumayer Station

    Weller, Rolf

  12. Ionic composition of snow from snow pit SP_NMsued031223 excavated near Neumayer Station

    Weller, Rolf

  13. Ionic composition of snow from snow pit SP_NMsued030107 excavated near Neumayer Station

    Weller, Rolf

  14. Ionic composition of snow from snow pit SP_NMsued020212 excavated near Neumayer Station

    Weller, Rolf

  15. Ionic composition of snow from snow pit SP_NMsued010110 excavated near Neumayer Station

    Weller, Rolf

  16. Ionic composition of snow from snow pit SP_NMsued000125 excavated near Neumayer Station

    Weller, Rolf

  17. Airchemistry at Neumayer station, Antarctica during the year 2011

    Weller, Rolf

  18. Airchemistry at Neumayer station, Antarctica during the year 2010

    Weller, Rolf

  19. Continuous 25-years aerosol records at coastal Antarctica: Part I. Variability and climate implications of ionic compounds

    Weller, Rolf; Wagenbach, Dietmar; Legrand, Julien; Elsässer, Christoph; Tian-Kunze, Xiangshan; König-Langlo, Gert
    The aerosol climatology at the coastal Antarctic Neumayer Station (NM) was investigated based on continuous, 25-yr long observations of biogenic sulphur components (methanesulfonate and non-sea salt sulphate), sea salt and nitrate. Although significant long-term trends could only be detected for nitrate (-3.6 ± 2.5% per year between 1983 and 1993 and +4.0 ± 3.2% per year from 1993-2007), non-harmonic periodicities between 2 and 5 yr were typical for all species. Dedicated time series analyses revealed that relations to sea ice extent and various circulation indices are weak at best or not significant. In particular, no consistent link between sea ice...

  20. Airchemistry at Neumayer station, Antarctica during the year 2009

    Weller, Rolf

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