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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ftdoajarticles:oai:doaj.org/article:b38bf04a62144e9d805510ce0ab66163 2023-05-15T15:13:53+02:00 Relationships between particles, cloud condensation nuclei and cloud droplet activation during the third Pallas Cloud Experiment T. Anttila D. Brus A. Jaatinen A.-P. Hyvärinen N. Kivekäs S. Romakkaniemi M. Komppula H. Lihavainen 2012-12-01T00:00:00Z https://doi.org/10.5194/acp-12-11435-2012 https://doaj.org/article/b38bf04a62144e9d805510ce0ab66163 EN eng Copernicus Publications http://www.atmos-chem-phys.net/12/11435/2012/acp-12-11435-2012.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-12-11435-2012 1680-7316 1680-7324 https://doaj.org/article/b38bf04a62144e9d805510ce0ab66163 Atmospheric Chemistry and Physics, Vol 12, Iss 23, Pp 11435-11450 (2012) Physics QC1-999 Chemistry QD1-999 article 2012 ftdoajarticles https://doi.org/10.5194/acp-12-11435-2012 2022-12-31T04:00:13Z 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, D 50 , 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 Directory of Open Access Journals: DOAJ Articles Arctic Atmospheric Chemistry and Physics 12 23 11435 11450 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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English |
topic |
Physics QC1-999 Chemistry QD1-999 |
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Physics QC1-999 Chemistry QD1-999 T. Anttila D. Brus A. Jaatinen A.-P. Hyvärinen N. Kivekäs S. Romakkaniemi M. Komppula H. Lihavainen Relationships between particles, cloud condensation nuclei and cloud droplet activation during the third Pallas Cloud Experiment |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
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, D 50 , 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 |
T. Anttila D. Brus A. Jaatinen A.-P. Hyvärinen N. Kivekäs S. Romakkaniemi M. Komppula H. Lihavainen |
author_facet |
T. Anttila D. Brus A. Jaatinen A.-P. Hyvärinen N. Kivekäs S. Romakkaniemi M. Komppula H. Lihavainen |
author_sort |
T. Anttila |
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://doaj.org/article/b38bf04a62144e9d805510ce0ab66163 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Northern Finland |
genre_facet |
Arctic Northern Finland |
op_source |
Atmospheric Chemistry and Physics, Vol 12, Iss 23, Pp 11435-11450 (2012) |
op_relation |
http://www.atmos-chem-phys.net/12/11435/2012/acp-12-11435-2012.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-12-11435-2012 1680-7316 1680-7324 https://doaj.org/article/b38bf04a62144e9d805510ce0ab66163 |
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 |
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1766344395166056448 |