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

Rastak, N.; Silvergren, Sanna LU ; Zieger, P.; Wideqvist, U.; Strom, J.; Svenningsson, Birgitta LU ; Maturilli, M.; Tesche, M.; Ekman, A. M. L. and Tunved, P., et al. (2014) In Atmospheric Chemistry and Physics 14(14). p.7445-7460
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-Alesund, 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... (More)
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-Alesund, 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). (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Atmospheric Chemistry and Physics
volume
14
issue
14
pages
7445 - 7460
publisher
Copernicus Gesellschaft Mbh
external identifiers
  • wos:000339934900018
  • scopus:84904635366
ISSN
1680-7324
DOI
10.5194/acp-14-7445-2014
project
MERGE
language
English
LU publication?
yes
id
c6c153a8-ccd6-44ac-a1fe-cc0b4a0d5c56 (old id 4665574)
date added to LUP
2014-09-25 14:48:13
date last changed
2017-04-16 03:09:20
@article{c6c153a8-ccd6-44ac-a1fe-cc0b4a0d5c56,
  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-Alesund, 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 (&lt; 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).},
  author       = {Rastak, N. and Silvergren, Sanna and Zieger, P. and Wideqvist, U. and Strom, J. and Svenningsson, Birgitta and Maturilli, M. and Tesche, M. and Ekman, A. M. L. and Tunved, P. and Riipinen, I.},
  issn         = {1680-7324},
  language     = {eng},
  number       = {14},
  pages        = {7445--7460},
  publisher    = {Copernicus Gesellschaft Mbh},
  series       = {Atmospheric Chemistry and Physics},
  title        = {Seasonal variation of aerosol water uptake and its impact on the direct radiative effect at Ny-Alesund, Svalbard},
  url          = {http://dx.doi.org/10.5194/acp-14-7445-2014},
  volume       = {14},
  year         = {2014},
}