Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 5.668 IF 5.668
  • IF 5-year value: 6.201 IF 5-year
    6.201
  • CiteScore value: 6.13 CiteScore
    6.13
  • SNIP value: 1.633 SNIP 1.633
  • IPP value: 5.91 IPP 5.91
  • SJR value: 2.938 SJR 2.938
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 174 Scimago H
    index 174
  • h5-index value: 87 h5-index 87
Volume 14, issue 14
Atmos. Chem. Phys., 14, 7445–7460, 2014
https://doi.org/10.5194/acp-14-7445-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Interactions between climate change and the Cryosphere: SVALI,...

Atmos. Chem. Phys., 14, 7445–7460, 2014
https://doi.org/10.5194/acp-14-7445-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 21 Jul 2014

Research article | 21 Jul 2014

Seasonal variation of aerosol water uptake and its impact on the direct radiative effect at Ny-Ålesund, Svalbard

N. Rastak1, S. Silvergren3,*, P. Zieger1, U. Wideqvist1, J. Ström1, B. Svenningsson3, M. Maturilli4, M. Tesche1, A. M. L. Ekman2, P. Tunved1, and I. Riipinen1 N. Rastak et al.
  • 1Department of Applied Environmental Science (ITM) and Bert Bolin Centre for Climate Research, Stockholm University, S 114 18 Stockholm, Sweden
  • 2Department of Meteorology (MISU) and Bert Bolin Centre for Climate Research, Stockholm University, S 106 91 Stockholm, Sweden
  • 3Division of Nuclear Physics, Lund University, P.O. Box 118, SE-211 00 Lund, Sweden
  • 4Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Telegrafenberg A43, 14473 Potsdam, Germany
  • *now at: Stockholm Environment and Health Administration, P.O. Box 8136, 104 20 Stockholm, Sweden

Abstract. In this study we investigated the impact of water uptake by aerosol particles in ambient atmosphere on their optical properties and their direct radiative effect (ADRE, W m−2) in the Arctic at Ny-Ålesund, Svalbard, during 2008. To achieve this, we combined three models, a hygroscopic growth model, a Mie model and a radiative transfer model, with an extensive set of observational data. We found that the seasonal variation of dry aerosol scattering coefficients showed minimum values during the summer season and the beginning of fall (July-August-September), when small particles (< 100 nm in diameter) dominate the aerosol number size distribution. The maximum scattering by dry particles was observed during the Arctic haze period (March-April-May) when the average size of the particles was larger. Considering the hygroscopic growth of aerosol particles in the ambient atmosphere had a significant impact on the aerosol scattering coefficients: the aerosol scattering coefficients were enhanced by on average a factor of 4.30 ± 2.26 (mean ± standard deviation), with lower values during the haze period (March-April-May) as compared to summer and fall. Hygroscopic growth of aerosol particles was found to cause 1.6 to 3.7 times more negative ADRE at the surface, with the smallest effect during the haze period (March-April-May) and the highest during late summer and beginning of fall (July-August-September).

Publications Copernicus
Download
Citation