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Discussion papers
https://doi.org/10.5194/acp-2019-985
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-985
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 04 Nov 2019

Submitted as: research article | 04 Nov 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

The influence of anomalous atmospheric conditions at Ny-Ålesund on clouds and their radiative effect

Tatiana Nomokonova1, Kerstin Ebell1, Ulrich Löhnert1, Marion Maturilli2, and Christoph Ritter2 Tatiana Nomokonova et al.
  • 1Institute for Geophysics and Meteorology, University of Cologne, Cologne, Germany
  • 2Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany

Abstract. This study analyses occurrence of events with increased and decreased integrated water vapor (IWV) and atmospheric temperature (T) at the Arctic site Ny-Ålesund and their relation to cloud properties and the surface cloud radiative effect (CRE). For this study, we used almost 2.5 years (from June 2016 to October 2018) of ground-based cloud observations processed with the Cloudnet algorithm, IWV and T from microwave radiometer (MWR), long-term radiosonde observations, and backward trajectories FLEXTRA. Moist and dry anomalies were found to be associated with North Atlantic flows and air circulations in the Arctic region, respectively. The amount of water vapor is often correlated with cloud occurrence, presence of cloud liquid water, liquid and ice water path (LWP and IWP). In turn, changes in the cloud properties cause differences in surface CRE. During dry anomalies, in autumn, winter, and spring, the mean net surface CRE was lower by 2–37 W m−2 with respect to normal conditions, while in summer the cloud related surface cooling was reduced by 49 W m−2. In contrast, under moist conditions in summer the mean net surface CRE becomes more negative by 25 W m−2, while in other seasons the mean net surface CRE was increased by 5–37 W m−2. Trends in occurrence of dry and moist anomalies were analyzed based on 25-year-radiosonde database. Dry anomalies become less frequent with rates for different seasons from −12.8 to −4 % per decade, while the occurrence of moist event increases at rates from 2.8 to 6.4 % per decade. Taking into account the relations between the anomaly types and cloud properties the trends might be related to an increase in cloud occurrence, LWP, and IWP. The change in cloud properties could, in turn, modulate the surface CRE and lead to stronger surface cooling and warming related to clouds in summer and other seasons, respectively.

Tatiana Nomokonova et al.
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Data sets

Homogenized radiosonde record at station Ny-Ålesund, Spitsbergen, 1993-2014. PANGAEA M. Maturilli and M. Kayser https://doi.org/10.1594/PANGAEA.845373

Homogenized radiosonde record at station Ny-Ålesund, Spitsbergen, 2015-2016. PANGAEA M. Maturilli and M. Kayser https://doi.org/10.1594/PANGAEA.875196

High resolution radiosonde measurements from station Ny-Ålesund (2017-04). Alfred Wegener Institute - Research Unit Potsdam, PANGAEA M. Maturilli https://doi.org/10.1594/PANGAEA.879767

High resolution radiosonde measurements from station Ny-Ålesund (2017-05). Alfred Wegener Institute - Research Unit Potsdam, PANGAEA M. Maturilli https://doi.org/10.1594/PANGAEA.879820

High resolution radiosonde measurements from station Ny-Ålesund (2017-06). Alfred Wegener Institute - Research Unit Potsdam, PANGAEA M. Maturilli https://doi.org/10.1594/PANGAEA.879822

High resolution radiosonde measurements from station Ny-Ålesund (2017-07). Alfred Wegener Institute - Research Unit Potsdam, PANGAEA M. Maturilli https://doi.org/10.1594/PANGAEA.879823

Integrated water vapor of HATPRO microwave radiometer at AWIPEV, Ny-Ålesund (2016). PANGAEA T. Nomokonova, C. Ritter, and K. Ebell https://doi.org/10.1594/PANGAEA.902140

Integrated water vapor of HATPRO microwave radiometer at AWIPEV, Ny-Ålesund (2017). PANGAEA T. Nomokonova, C. Ritter, and K. Ebell https://doi.org/10.1594/PANGAEA.902142

Integrated water vapor of HATPRO microwave radiometer at AWIPEV, Ny-Ålesund (2018). PANGAEA T. Nomokonova, C. Ritter, and K. Ebell https://doi.org/10.1594/PANGAEA.902143

Liquid water path of HATPRO microwave radiometer at AWIPEV, Ny-Ålesund (2016). PANGAEA T. Nomokonova, C. Ritter, and K. Ebell https://doi.org/10.1594/PANGAEA.902096

Liquid water path of HATPRO microwave radiometer at AWIPEV, Ny-Ålesund (2017). PANGAEA T. Nomokonova, C. Ritter, and K. Ebell https://doi.org/10.1594/PANGAEA.902098

Liquid water path of HATPRO microwave radiometer at AWIPEV, Ny-Ålesund (2018). PANGAEA T. Nomokonova, C. Ritter, and K. Ebell https://doi.org/10.1594/PANGAEA.902099

Temperature profile of HATPRO microwave radiometer at AWIPEV, Ny-Ålesund (2016). PANGAEA T. Nomokonova, C. Ritter, and K. Ebell https://doi.pangaea.de/10.1594/PANGAEA.902145

Temperature profile of HATPRO microwave radiometer at AWIPEV, Ny-Ålesund (2017). PANGAEA T. Nomokonova, C. Ritter, and K. Ebell https://doi.pangaea.de/10.1594/PANGAEA.902146

Temperature profile of HATPRO microwave radiometer at AWIPEV, Ny-Ålesund (2018). PANGAEA T. Nomokonova, C. Ritter, and K. Ebell https://doi.pangaea.de/10.1594/PANGAEA.902147

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Short summary
This paper presents an influence of water vapor anomalies on cloud properties and their radiative effect at Ny-Ålesund. The study is based on 2.5-year active and passive cloud observations and a radiative transfer model. The results show that moist and dry conditions are related to strong changes in cloud occurrence, phase partitioning, water path, and, consequently, modulate the surface radiative budget.
This paper presents an influence of water vapor anomalies on cloud properties and their...
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