References

ACP

Atmospheric Chemistry and Physics

ACP

Atmos. Chem. Phys.

1680-7324

Copernicus Publications

Göttingen, Germany

10.5194/acp-14-7445-2014

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

Rastak

¹ Silvergren

³ ⁵ Zieger

https://orcid.org/0000-0001-7000-6879

¹ Wideqvist

¹ Ström

¹ Svenningsson

³ Maturilli

https://orcid.org/0000-0001-6818-7383

⁴ Tesche

https://orcid.org/0000-0003-0096-4785

¹ Ekman

A. M. L.

https://orcid.org/0000-0002-5940-2114

² Tunved

¹ Riipinen

Department of Applied Environmental Science (ITM) and Bert Bolin Centre for Climate Research, Stockholm University, S 114 18 Stockholm, Sweden

Department of Meteorology (MISU) and Bert Bolin Centre for Climate Research, Stockholm University, S 106 91 Stockholm, Sweden

Division of Nuclear Physics, Lund University, P.O. Box 118, SE-211 00 Lund, Sweden

Alfred 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

21 07 2014

14 14 7445 7460

2014

This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/

This article is available from https://acp.copernicus.org/articles/14/7445/2014/acp-14-7445-2014.html

The full text article is available as a PDF file from https://acp.copernicus.org/articles/14/7445/2014/acp-14-7445-2014.pdf

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<sup>−2</sup>) 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).

European Commission

ATMOGAIN - Atmospheric Gas-Aerosol Interface: From Fundamental Theory to Global Effects (278277)

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