A comparative study of K-rich and Na/Ca-rich feldspar ice-nucleating
particles in a nanoliter droplet freezing assay

Peckhaus, Andreas; Kiselev, Alexei; Hiron, Thibault; Ebert, Martin; Leisner, Thomas

doi:10.5194/acp-16-11477-2016

Articles | Volume 16, issue 18

https://doi.org/10.5194/acp-16-11477-2016

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

Special issue:

Results from the ice nucleation research unit (INUIT) (ACP/AMT...

https://doi.org/10.5194/acp-16-11477-2016

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

Articles | Volume 16, issue 18

Research article

|

15 Sep 2016

Research article |

| 15 Sep 2016

A comparative study of K-rich and Na/Ca-rich feldspar ice-nucleating particles in a nanoliter droplet freezing assay

Andreas Peckhaus, Alexei Kiselev, Thibault Hiron, Martin Ebert, and Thomas Leisner

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Cumulative views and downloads (calculated since 27 Jan 2016)

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Apr 2016	14	11	0	25
May 2016	18	14	0	32
Jun 2016	24	8	2	34
Jul 2016	21	21	0	42
Aug 2016	18	10	1	29
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Oct 2016	31	17	1	49
Nov 2016	16	20	0	36
Dec 2016	17	17	2	36
Jan 2017	17	30	1	48
Feb 2017	18	31	1	50
Mar 2017	26	31	3	60
Apr 2017	27	22	6	55
May 2017	37	24	5	66
Jun 2017	28	10	3	41
Jul 2017	23	15	6	44
Aug 2017	23	30	3	56
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Oct 2017	21	31	7	59
Nov 2017	23	40	4	67
Dec 2017	19	18	4	41
Jan 2018	12	23	4	39
Feb 2018	13	24	5	42
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Jan 2024	45	12	1	58
Feb 2024	49	13	3	65
Mar 2024	54	18	2	74
Apr 2024	62	15	2	79
May 2024	24	17	1	42
Jun 2024	23	15	3	41
Jul 2024	23	13	3	39
Aug 2024	42	14	2	58
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Oct 2024	25	15	1	41
Nov 2024	22	9	2	33
Dec 2024	19	434	1	454
Jan 2025	29	19	1	49
Feb 2025	42	10	1	53
Mar 2025	20	14	2	36
Apr 2025	28	12	0	40
May 2025	51	20	0	71
Jun 2025	59	14	1	74
Jul 2025	50	19	2	71
Aug 2025	53	22	1	76
Sep 2025	71	23	2	96
Oct 2025	35	31	1	67
Nov 2025	24	16	0	40

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Short summary

The precipitation in midlatitude clouds proceeds predominantly via nucleation of ice in the supercooled droplets containing foreign inclusions, like feldspar mineral dust, that have been recently identified as one of the most active ice nucleating agents in the atmosphere. We have built an apparatus to observe the freezing of feldspar immersed in up to 1500 identical droplets simultaneously. With this setup we investigated four feldspar samples and show that it can induce freezing at −5 °C.