In-cloud measurements highlight the role of aerosol hygroscopicity in cloud
droplet formation

Väisänen, Olli; Ruuskanen, Antti; Ylisirniö, Arttu; Miettinen, Pasi; Portin, Harri; Hao, Liqing; Leskinen, Ari; Komppula, Mika; Romakkaniemi, Sami; Lehtinen, Kari E. J.; Virtanen, Annele

doi:10.5194/acp-16-10385-2016

Articles | Volume 16, issue 16

https://doi.org/10.5194/acp-16-10385-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/acp-16-10385-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 16, issue 16

Research article

|

17 Aug 2016

Research article |

| 17 Aug 2016

In-cloud measurements highlight the role of aerosol hygroscopicity in cloud droplet formation

Olli Väisänen, Antti Ruuskanen, Arttu Ylisirniö, Pasi Miettinen, Harri Portin, Liqing Hao, Ari Leskinen, Mika Komppula, Sami Romakkaniemi, Kari E. J. Lehtinen, and Annele Virtanen

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Apr 2016	83	34	1	118
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Jun 2016	15	8	1	24
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Aug 2016	164	65	3	232
Sep 2016	41	30	2	73
Oct 2016	17	24	0	41
Nov 2016	12	17	0	29
Dec 2016	18	9	1	28
Jan 2017	19	11	1	31
Feb 2017	21	12	1	34
Mar 2017	30	18	4	52
Apr 2017	22	23	0	45
May 2017	24	20	1	45
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Aug 2017	7	8	0	15
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Jun 2025	41	11	2	54
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Aug 2025	38	7	2	47
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Cumulative views and downloads (calculated since 21 Apr 2016)

Month	HTML	PDF	XML	Total
Apr 2016	83	34	1	118
May 2016	70	26	2	98
Jun 2016	15	8	1	24
Jul 2016	13	5	3	21
Aug 2016	164	65	3	232
Sep 2016	41	30	2	73
Oct 2016	17	24	0	41
Nov 2016	12	17	0	29
Dec 2016	18	9	1	28
Jan 2017	19	11	1	31
Feb 2017	21	12	1	34
Mar 2017	30	18	4	52
Apr 2017	22	23	0	45
May 2017	24	20	1	45
Jun 2017	20	7	2	29
Jul 2017	16	7	0	23
Aug 2017	7	8	0	15
Sep 2017	13	15	1	29
Oct 2017	17	26	0	43
Nov 2017	15	10	0	25
Dec 2017	12	11	0	23
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Feb 2018	8	6	0	14
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Oct 2023	121	11	1	133
Nov 2023	90	5	1	96
Dec 2023	41	3	3	47
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Feb 2024	41	9	0	50
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Apr 2025	17	13	1	31
May 2025	32	9	2	43
Jun 2025	41	11	2	54
Jul 2025	28	10	1	39
Aug 2025	38	7	2	47
Sep 2025	43	8	2	53
Oct 2025	20	22	0	42
Nov 2025	22	12	5	39

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Short summary

In-cloud measurements of aerosol hygroscopicity and cloud droplet activation were conducted in Kuopio, Finland. According to the observations, the less hygroscopic accumulation mode particles were present in the non-activated aerosol, whereas the more hygroscopic particles were scavenged into cloud droplets. The results illustrate the sensitivity of cloud droplet formation to varying chemical composition and highlight the need for proper treatment of anthropogenic aerosols in CCN predictions.