Relationships between particles, cloud condensation nuclei and cloud droplet activation during the third Pallas Cloud Experiment
Concurrent measurement of aerosols, cloud condensation nuclei (CCN) and cloud droplet activation were carried out as a part of the third Pallas Cloud Experiment (PaCE-3) which took place at a ground based site located on northern Finland during the autumn of 2009. In this study, we investigate relat...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00045763 2023-05-15T15:13:12+02:00 Relationships between particles, cloud condensation nuclei and cloud droplet activation during the third Pallas Cloud Experiment Anttila, T. Brus, D. Jaatinen, A. Hyvärinen, A.-P. Kivekäs, N. Romakkaniemi, S. Komppula, M. Lihavainen, H. 2012-12 electronic https://doi.org/10.5194/acp-12-11435-2012 https://noa.gwlb.de/receive/cop_mods_00045763 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00045383/acp-12-11435-2012.pdf https://acp.copernicus.org/articles/12/11435/2012/acp-12-11435-2012.pdf eng eng Copernicus Publications Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-12-11435-2012 https://noa.gwlb.de/receive/cop_mods_00045763 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00045383/acp-12-11435-2012.pdf https://acp.copernicus.org/articles/12/11435/2012/acp-12-11435-2012.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2012 ftnonlinearchiv https://doi.org/10.5194/acp-12-11435-2012 2022-02-08T22:39:24Z Concurrent measurement of aerosols, cloud condensation nuclei (CCN) and cloud droplet activation were carried out as a part of the third Pallas Cloud Experiment (PaCE-3) which took place at a ground based site located on northern Finland during the autumn of 2009. In this study, we investigate relationships between the aerosol properties, CCN and size resolved cloud droplet activation. During the investigated cloudy periods, the inferred number of cloud droplets (CDNC) varied typically between 50 and 150 cm−3 and displayed a linear correlation both with the number of particles having sizes over 100 nm and with the CCN concentrations at 0.4% supersaturation. Furthermore, the diameter corresponding to the 50% activation fraction, D50, was generally in the range of 80 to 120 nm. The measured CCN concentrations were compared with predictions of a numerical model which used the measured size distribution and size resolved hygroscopicity as input. Assuming that the droplet surface tension is equal to that of water, the measured and predicted CCN concentrations were generally within 30%. We also simulated size dependent cloud droplet activation with a previously developed air parcel model. By forcing the model to reproduce the experimental values of CDNC, adiabatic estimates for the updraft velocity and the maximum supersaturation reached in the clouds were derived. Performed sensitivity studies showed further that the observed variability in CDNC was driven mainly by changes in the particle size distribution while the variations in the updraft velocity and hygroscopicity contributed to a lesser extent. The results of the study corroborate conclusions of previous studies according to which the number of cloud droplets formed in clean air masses close to the Arctic is determined mainly by the number of available CCN. Article in Journal/Newspaper Arctic Northern Finland Niedersächsisches Online-Archiv NOA Arctic Atmospheric Chemistry and Physics 12 23 11435 11450 |
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Niedersächsisches Online-Archiv NOA |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Anttila, T. Brus, D. Jaatinen, A. Hyvärinen, A.-P. Kivekäs, N. Romakkaniemi, S. Komppula, M. Lihavainen, H. Relationships between particles, cloud condensation nuclei and cloud droplet activation during the third Pallas Cloud Experiment |
topic_facet |
article Verlagsveröffentlichung |
description |
Concurrent measurement of aerosols, cloud condensation nuclei (CCN) and cloud droplet activation were carried out as a part of the third Pallas Cloud Experiment (PaCE-3) which took place at a ground based site located on northern Finland during the autumn of 2009. In this study, we investigate relationships between the aerosol properties, CCN and size resolved cloud droplet activation. During the investigated cloudy periods, the inferred number of cloud droplets (CDNC) varied typically between 50 and 150 cm−3 and displayed a linear correlation both with the number of particles having sizes over 100 nm and with the CCN concentrations at 0.4% supersaturation. Furthermore, the diameter corresponding to the 50% activation fraction, D50, was generally in the range of 80 to 120 nm. The measured CCN concentrations were compared with predictions of a numerical model which used the measured size distribution and size resolved hygroscopicity as input. Assuming that the droplet surface tension is equal to that of water, the measured and predicted CCN concentrations were generally within 30%. We also simulated size dependent cloud droplet activation with a previously developed air parcel model. By forcing the model to reproduce the experimental values of CDNC, adiabatic estimates for the updraft velocity and the maximum supersaturation reached in the clouds were derived. Performed sensitivity studies showed further that the observed variability in CDNC was driven mainly by changes in the particle size distribution while the variations in the updraft velocity and hygroscopicity contributed to a lesser extent. The results of the study corroborate conclusions of previous studies according to which the number of cloud droplets formed in clean air masses close to the Arctic is determined mainly by the number of available CCN. |
format |
Article in Journal/Newspaper |
author |
Anttila, T. Brus, D. Jaatinen, A. Hyvärinen, A.-P. Kivekäs, N. Romakkaniemi, S. Komppula, M. Lihavainen, H. |
author_facet |
Anttila, T. Brus, D. Jaatinen, A. Hyvärinen, A.-P. Kivekäs, N. Romakkaniemi, S. Komppula, M. Lihavainen, H. |
author_sort |
Anttila, T. |
title |
Relationships between particles, cloud condensation nuclei and cloud droplet activation during the third Pallas Cloud Experiment |
title_short |
Relationships between particles, cloud condensation nuclei and cloud droplet activation during the third Pallas Cloud Experiment |
title_full |
Relationships between particles, cloud condensation nuclei and cloud droplet activation during the third Pallas Cloud Experiment |
title_fullStr |
Relationships between particles, cloud condensation nuclei and cloud droplet activation during the third Pallas Cloud Experiment |
title_full_unstemmed |
Relationships between particles, cloud condensation nuclei and cloud droplet activation during the third Pallas Cloud Experiment |
title_sort |
relationships between particles, cloud condensation nuclei and cloud droplet activation during the third pallas cloud experiment |
publisher |
Copernicus Publications |
publishDate |
2012 |
url |
https://doi.org/10.5194/acp-12-11435-2012 https://noa.gwlb.de/receive/cop_mods_00045763 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00045383/acp-12-11435-2012.pdf https://acp.copernicus.org/articles/12/11435/2012/acp-12-11435-2012.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Northern Finland |
genre_facet |
Arctic Northern Finland |
op_relation |
Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-12-11435-2012 https://noa.gwlb.de/receive/cop_mods_00045763 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00045383/acp-12-11435-2012.pdf https://acp.copernicus.org/articles/12/11435/2012/acp-12-11435-2012.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-12-11435-2012 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
12 |
container_issue |
23 |
container_start_page |
11435 |
op_container_end_page |
11450 |
_version_ |
1766343791998926848 |