Subarctic atmospheric aerosol composition: 3. Measured and modeled properties of cloud condensation nuclei
Aerosol particles can modify cloud properties by acting as cloud condensation nuclei (CCN). Predicting CCN properties is still a challenge and not properly incorporated in current climate models. Atmospheric particle number size distributions, hygroscopic growth factors, and polydisperse CCN number...
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ftulundlup:oai:lup.lub.lu.se:10794e05-ebd9-442c-8d8a-c121b2a075c7 2023-05-15T15:10:59+02:00 Subarctic atmospheric aerosol composition: 3. Measured and modeled properties of cloud condensation nuclei Kammermann, Lukas Gysel, Martin Weingartner, Ernest Herich, Hanna Cziczo, Daniel J. Holst, Thomas Svenningsson, Birgitta Arneth, Almut Baltensperger, Urs 2010 https://lup.lub.lu.se/record/1568102 https://doi.org/10.1029/2009JD012447 eng eng Wiley-Blackwell https://lup.lub.lu.se/record/1568102 http://dx.doi.org/10.1029/2009JD012447 wos:000274789500002 scopus:77649145861 Journal of Geophysical Research; 115 (2010) ISSN: 2156-2202 Physical Geography contributiontojournal/article info:eu-repo/semantics/article text 2010 ftulundlup https://doi.org/10.1029/2009JD012447 2023-02-01T23:29:05Z Aerosol particles can modify cloud properties by acting as cloud condensation nuclei (CCN). Predicting CCN properties is still a challenge and not properly incorporated in current climate models. Atmospheric particle number size distributions, hygroscopic growth factors, and polydisperse CCN number concentrations were measured at the remote subarctic Stordalen mire, 200 km north of the Arctic Circle in northern Sweden. The CCN number concentration was highly variable, largely driven by variations in the total number of sufficiently large particles, though the variability of chemical composition was increasingly important for decreasing supersaturation. The hygroscopicity of particles measured by a hygroscopicity tandem differential mobility analyzer (HTDMA) was in agreement with large critical diameters observed for CCN activation (kappa approximate to 0.07-0.21 for D = 50-200 nm). Size distribution and time- and size-resolved HTDMA data were used to predict CCN number concentrations. Agreement of predictions with measured CCN within +/- 11% was achieved using parameterized Kohler theory and assuming a surface tension of pure water. The sensitivity of CCN predictions to various simplifying assumptions was further explored: We found that (1) ignoring particle mixing state did not affect CCN predictions, (2) averaging the HTDMA data in time with retaining the size dependence did not introduce a substantial bias, while individual predictions became more uncertain, and (3) predictions involving the hygroscopicity parameter recommended in literature for continental sites (kappa approximate to 0.3 +/- 0.1) resulted in a significant prediction bias. Future modeling studies should therefore at least aim at using averaged, size-resolved, site-specific hygroscopicity or chemical composition data for predictions of CCN number concentrations. Article in Journal/Newspaper Arctic Northern Sweden Subarctic Lund University Publications (LUP) Arctic Stordalen ENVELOPE(7.337,7.337,62.510,62.510) Journal of Geophysical Research 115 D4 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Physical Geography |
spellingShingle |
Physical Geography Kammermann, Lukas Gysel, Martin Weingartner, Ernest Herich, Hanna Cziczo, Daniel J. Holst, Thomas Svenningsson, Birgitta Arneth, Almut Baltensperger, Urs Subarctic atmospheric aerosol composition: 3. Measured and modeled properties of cloud condensation nuclei |
topic_facet |
Physical Geography |
description |
Aerosol particles can modify cloud properties by acting as cloud condensation nuclei (CCN). Predicting CCN properties is still a challenge and not properly incorporated in current climate models. Atmospheric particle number size distributions, hygroscopic growth factors, and polydisperse CCN number concentrations were measured at the remote subarctic Stordalen mire, 200 km north of the Arctic Circle in northern Sweden. The CCN number concentration was highly variable, largely driven by variations in the total number of sufficiently large particles, though the variability of chemical composition was increasingly important for decreasing supersaturation. The hygroscopicity of particles measured by a hygroscopicity tandem differential mobility analyzer (HTDMA) was in agreement with large critical diameters observed for CCN activation (kappa approximate to 0.07-0.21 for D = 50-200 nm). Size distribution and time- and size-resolved HTDMA data were used to predict CCN number concentrations. Agreement of predictions with measured CCN within +/- 11% was achieved using parameterized Kohler theory and assuming a surface tension of pure water. The sensitivity of CCN predictions to various simplifying assumptions was further explored: We found that (1) ignoring particle mixing state did not affect CCN predictions, (2) averaging the HTDMA data in time with retaining the size dependence did not introduce a substantial bias, while individual predictions became more uncertain, and (3) predictions involving the hygroscopicity parameter recommended in literature for continental sites (kappa approximate to 0.3 +/- 0.1) resulted in a significant prediction bias. Future modeling studies should therefore at least aim at using averaged, size-resolved, site-specific hygroscopicity or chemical composition data for predictions of CCN number concentrations. |
format |
Article in Journal/Newspaper |
author |
Kammermann, Lukas Gysel, Martin Weingartner, Ernest Herich, Hanna Cziczo, Daniel J. Holst, Thomas Svenningsson, Birgitta Arneth, Almut Baltensperger, Urs |
author_facet |
Kammermann, Lukas Gysel, Martin Weingartner, Ernest Herich, Hanna Cziczo, Daniel J. Holst, Thomas Svenningsson, Birgitta Arneth, Almut Baltensperger, Urs |
author_sort |
Kammermann, Lukas |
title |
Subarctic atmospheric aerosol composition: 3. Measured and modeled properties of cloud condensation nuclei |
title_short |
Subarctic atmospheric aerosol composition: 3. Measured and modeled properties of cloud condensation nuclei |
title_full |
Subarctic atmospheric aerosol composition: 3. Measured and modeled properties of cloud condensation nuclei |
title_fullStr |
Subarctic atmospheric aerosol composition: 3. Measured and modeled properties of cloud condensation nuclei |
title_full_unstemmed |
Subarctic atmospheric aerosol composition: 3. Measured and modeled properties of cloud condensation nuclei |
title_sort |
subarctic atmospheric aerosol composition: 3. measured and modeled properties of cloud condensation nuclei |
publisher |
Wiley-Blackwell |
publishDate |
2010 |
url |
https://lup.lub.lu.se/record/1568102 https://doi.org/10.1029/2009JD012447 |
long_lat |
ENVELOPE(7.337,7.337,62.510,62.510) |
geographic |
Arctic Stordalen |
geographic_facet |
Arctic Stordalen |
genre |
Arctic Northern Sweden Subarctic |
genre_facet |
Arctic Northern Sweden Subarctic |
op_source |
Journal of Geophysical Research; 115 (2010) ISSN: 2156-2202 |
op_relation |
https://lup.lub.lu.se/record/1568102 http://dx.doi.org/10.1029/2009JD012447 wos:000274789500002 scopus:77649145861 |
op_doi |
https://doi.org/10.1029/2009JD012447 |
container_title |
Journal of Geophysical Research |
container_volume |
115 |
container_issue |
D4 |
_version_ |
1766341907308347392 |