Size-dependent activation of aerosols into cloud droplets at a subarctic background site during the second Pallas Cloud Experiment (2nd PaCE): method development and data evaluation
In situ measurements of aerosol water uptake and activation of aerosols into cloud droplets provide information on how aerosols influence the microphysical properties of clouds. Here we present a computational scheme that can be used in connection with such measurements to assess the influence of th...
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ftdoajarticles:oai:doaj.org/article:6b2d60861ad34a6eb21ed4a12e68ea15 2023-05-15T17:42:48+02:00 Size-dependent activation of aerosols into cloud droplets at a subarctic background site during the second Pallas Cloud Experiment (2nd PaCE): method development and data evaluation A. Laaksonen V.-M. Kerminen H. Lihavainen A.-P. Hyvärinen M. Komppula P. Vaattovaara T. Anttila 2009-07-01T00:00:00Z https://doaj.org/article/6b2d60861ad34a6eb21ed4a12e68ea15 EN eng Copernicus Publications http://www.atmos-chem-phys.net/9/4841/2009/acp-9-4841-2009.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/6b2d60861ad34a6eb21ed4a12e68ea15 Atmospheric Chemistry and Physics, Vol 9, Iss 14, Pp 4841-4854 (2009) Physics QC1-999 Chemistry QD1-999 article 2009 ftdoajarticles 2022-12-31T00:32:08Z In situ measurements of aerosol water uptake and activation of aerosols into cloud droplets provide information on how aerosols influence the microphysical properties of clouds. Here we present a computational scheme that can be used in connection with such measurements to assess the influence of the particle hygroscopicity and mixing state (in terms of the water uptake) on the cloud nucleating ability of particles. Additionally, it provides an estimate for the peak supersaturation of water vapour reached during the formation of the observed cloud(s). The method was applied in interpreting results of a measurement campaign that focused on aerosol-cloud interactions taking place at a subarctic background site located in Northern Finland (second Pallas Cloud Experiment, 2nd PaCE). A set of case studies was conducted, and the observed activation behavior could be successfully explained by a maximum supersaturation that varied between 0.18 and 0.26% depending on the case. In these cases, the diameter corresponding to the activated fraction of 50% was in the range of 110–140 nm, and the particles were only moderately water soluble with hygroscopic growth factors varying between 1.1 and 1.4. The conducted analysis showed that the activated fractions and the total number of particles acting as CCN are expected to be highly sensitive to the particle hygroscopic growth properties. For example, the latter quantity varied over a factor between 1.8 and 3.1, depending on the case, when the mean hygroscopic growth factors were varied by 10%. Another important conclusion is that size-dependent activation profiles carries information on the mixing state of particles. Article in Journal/Newspaper Northern Finland Subarctic Directory of Open Access Journals: DOAJ Articles |
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Directory of Open Access Journals: DOAJ Articles |
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language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
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Physics QC1-999 Chemistry QD1-999 A. Laaksonen V.-M. Kerminen H. Lihavainen A.-P. Hyvärinen M. Komppula P. Vaattovaara T. Anttila Size-dependent activation of aerosols into cloud droplets at a subarctic background site during the second Pallas Cloud Experiment (2nd PaCE): method development and data evaluation |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
In situ measurements of aerosol water uptake and activation of aerosols into cloud droplets provide information on how aerosols influence the microphysical properties of clouds. Here we present a computational scheme that can be used in connection with such measurements to assess the influence of the particle hygroscopicity and mixing state (in terms of the water uptake) on the cloud nucleating ability of particles. Additionally, it provides an estimate for the peak supersaturation of water vapour reached during the formation of the observed cloud(s). The method was applied in interpreting results of a measurement campaign that focused on aerosol-cloud interactions taking place at a subarctic background site located in Northern Finland (second Pallas Cloud Experiment, 2nd PaCE). A set of case studies was conducted, and the observed activation behavior could be successfully explained by a maximum supersaturation that varied between 0.18 and 0.26% depending on the case. In these cases, the diameter corresponding to the activated fraction of 50% was in the range of 110–140 nm, and the particles were only moderately water soluble with hygroscopic growth factors varying between 1.1 and 1.4. The conducted analysis showed that the activated fractions and the total number of particles acting as CCN are expected to be highly sensitive to the particle hygroscopic growth properties. For example, the latter quantity varied over a factor between 1.8 and 3.1, depending on the case, when the mean hygroscopic growth factors were varied by 10%. Another important conclusion is that size-dependent activation profiles carries information on the mixing state of particles. |
format |
Article in Journal/Newspaper |
author |
A. Laaksonen V.-M. Kerminen H. Lihavainen A.-P. Hyvärinen M. Komppula P. Vaattovaara T. Anttila |
author_facet |
A. Laaksonen V.-M. Kerminen H. Lihavainen A.-P. Hyvärinen M. Komppula P. Vaattovaara T. Anttila |
author_sort |
A. Laaksonen |
title |
Size-dependent activation of aerosols into cloud droplets at a subarctic background site during the second Pallas Cloud Experiment (2nd PaCE): method development and data evaluation |
title_short |
Size-dependent activation of aerosols into cloud droplets at a subarctic background site during the second Pallas Cloud Experiment (2nd PaCE): method development and data evaluation |
title_full |
Size-dependent activation of aerosols into cloud droplets at a subarctic background site during the second Pallas Cloud Experiment (2nd PaCE): method development and data evaluation |
title_fullStr |
Size-dependent activation of aerosols into cloud droplets at a subarctic background site during the second Pallas Cloud Experiment (2nd PaCE): method development and data evaluation |
title_full_unstemmed |
Size-dependent activation of aerosols into cloud droplets at a subarctic background site during the second Pallas Cloud Experiment (2nd PaCE): method development and data evaluation |
title_sort |
size-dependent activation of aerosols into cloud droplets at a subarctic background site during the second pallas cloud experiment (2nd pace): method development and data evaluation |
publisher |
Copernicus Publications |
publishDate |
2009 |
url |
https://doaj.org/article/6b2d60861ad34a6eb21ed4a12e68ea15 |
genre |
Northern Finland Subarctic |
genre_facet |
Northern Finland Subarctic |
op_source |
Atmospheric Chemistry and Physics, Vol 9, Iss 14, Pp 4841-4854 (2009) |
op_relation |
http://www.atmos-chem-phys.net/9/4841/2009/acp-9-4841-2009.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/6b2d60861ad34a6eb21ed4a12e68ea15 |
_version_ |
1766144715873320960 |