Effects of relative humidity on aerosol light scattering: results from different European sites
The effect of aerosol water uptake on the aerosol particle light scattering coefficient (σ sp ) is described in this study by comparing measurements from five European sites: the Jungfraujoch, located in the Swiss Alps at 3580 m a.s.l.; Ny-Ålesund, located on Spitsbergen in the Arctic; Mace Head, a...
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ftdoajarticles:oai:doaj.org/article:c02fe9a1d40f4ea1ae585c2c0cfcce6d 2023-05-15T15:00:40+02:00 Effects of relative humidity on aerosol light scattering: results from different European sites P. Zieger R. Fierz-Schmidhauser E. Weingartner U. Baltensperger 2013-11-01T00:00:00Z https://doi.org/10.5194/acp-13-10609-2013 https://doaj.org/article/c02fe9a1d40f4ea1ae585c2c0cfcce6d EN eng Copernicus Publications http://www.atmos-chem-phys.net/13/10609/2013/acp-13-10609-2013.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 doi:10.5194/acp-13-10609-2013 https://doaj.org/article/c02fe9a1d40f4ea1ae585c2c0cfcce6d Atmospheric Chemistry and Physics, Vol 13, Iss 21, Pp 10609-10631 (2013) Physics QC1-999 Chemistry QD1-999 article 2013 ftdoajarticles https://doi.org/10.5194/acp-13-10609-2013 2022-12-30T21:59:37Z The effect of aerosol water uptake on the aerosol particle light scattering coefficient (σ sp ) is described in this study by comparing measurements from five European sites: the Jungfraujoch, located in the Swiss Alps at 3580 m a.s.l.; Ny-Ålesund, located on Spitsbergen in the Arctic; Mace Head, a coastal site in Ireland; Cabauw, a rural site in the Netherlands; and Melpitz, a regional background site in Eastern Germany. These sites were selected according to the aerosol type usually encountered at that location. The scattering enhancement factor f (RH, λ) is the key parameter to describe the effect of water uptake on the particle light scattering. It is defined as the σ sp (RH) at a certain relative humidity (RH) and wavelength λ divided by its dry value. f (RH) at the five sites varied widely, starting at very low values of f (RH = 85%, λ = 550 nm) around 1.28 for mineral dust, and reaching up to 3.41 for Arctic aerosol. Hysteresis behavior was observed at all sites except at the Jungfraujoch (due to the absence of sea salt). Closure studies and Mie simulations showed that both size and chemical composition determine the magnitude of f (RH). Both parameters are also needed to successfully predict f (RH). Finally, the measurement results were compared to the widely used aerosol model, OPAC (Hess et al., 1998). Significant discrepancies were seen, especially at intermediate RH ranges; these were mainly attributed to inappropriate implementation of hygroscopic growth in the OPAC model. Replacement of the hygroscopic growth with values from the recent literature resulted in a clear improvement of the OPAC model. Article in Journal/Newspaper Arctic Ny Ålesund Ny-Ålesund Spitsbergen Directory of Open Access Journals: DOAJ Articles Arctic Ny-Ålesund Mace ENVELOPE(155.883,155.883,-81.417,-81.417) Hess ENVELOPE(-65.133,-65.133,-67.200,-67.200) Atmospheric Chemistry and Physics 13 21 10609 10631 |
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Directory of Open Access Journals: DOAJ Articles |
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language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 P. Zieger R. Fierz-Schmidhauser E. Weingartner U. Baltensperger Effects of relative humidity on aerosol light scattering: results from different European sites |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
The effect of aerosol water uptake on the aerosol particle light scattering coefficient (σ sp ) is described in this study by comparing measurements from five European sites: the Jungfraujoch, located in the Swiss Alps at 3580 m a.s.l.; Ny-Ålesund, located on Spitsbergen in the Arctic; Mace Head, a coastal site in Ireland; Cabauw, a rural site in the Netherlands; and Melpitz, a regional background site in Eastern Germany. These sites were selected according to the aerosol type usually encountered at that location. The scattering enhancement factor f (RH, λ) is the key parameter to describe the effect of water uptake on the particle light scattering. It is defined as the σ sp (RH) at a certain relative humidity (RH) and wavelength λ divided by its dry value. f (RH) at the five sites varied widely, starting at very low values of f (RH = 85%, λ = 550 nm) around 1.28 for mineral dust, and reaching up to 3.41 for Arctic aerosol. Hysteresis behavior was observed at all sites except at the Jungfraujoch (due to the absence of sea salt). Closure studies and Mie simulations showed that both size and chemical composition determine the magnitude of f (RH). Both parameters are also needed to successfully predict f (RH). Finally, the measurement results were compared to the widely used aerosol model, OPAC (Hess et al., 1998). Significant discrepancies were seen, especially at intermediate RH ranges; these were mainly attributed to inappropriate implementation of hygroscopic growth in the OPAC model. Replacement of the hygroscopic growth with values from the recent literature resulted in a clear improvement of the OPAC model. |
format |
Article in Journal/Newspaper |
author |
P. Zieger R. Fierz-Schmidhauser E. Weingartner U. Baltensperger |
author_facet |
P. Zieger R. Fierz-Schmidhauser E. Weingartner U. Baltensperger |
author_sort |
P. Zieger |
title |
Effects of relative humidity on aerosol light scattering: results from different European sites |
title_short |
Effects of relative humidity on aerosol light scattering: results from different European sites |
title_full |
Effects of relative humidity on aerosol light scattering: results from different European sites |
title_fullStr |
Effects of relative humidity on aerosol light scattering: results from different European sites |
title_full_unstemmed |
Effects of relative humidity on aerosol light scattering: results from different European sites |
title_sort |
effects of relative humidity on aerosol light scattering: results from different european sites |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/acp-13-10609-2013 https://doaj.org/article/c02fe9a1d40f4ea1ae585c2c0cfcce6d |
long_lat |
ENVELOPE(155.883,155.883,-81.417,-81.417) ENVELOPE(-65.133,-65.133,-67.200,-67.200) |
geographic |
Arctic Ny-Ålesund Mace Hess |
geographic_facet |
Arctic Ny-Ålesund Mace Hess |
genre |
Arctic Ny Ålesund Ny-Ålesund Spitsbergen |
genre_facet |
Arctic Ny Ålesund Ny-Ålesund Spitsbergen |
op_source |
Atmospheric Chemistry and Physics, Vol 13, Iss 21, Pp 10609-10631 (2013) |
op_relation |
http://www.atmos-chem-phys.net/13/10609/2013/acp-13-10609-2013.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 doi:10.5194/acp-13-10609-2013 https://doaj.org/article/c02fe9a1d40f4ea1ae585c2c0cfcce6d |
op_doi |
https://doi.org/10.5194/acp-13-10609-2013 |
container_title |
Atmospheric Chemistry and Physics |
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13 |
container_issue |
21 |
container_start_page |
10609 |
op_container_end_page |
10631 |
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