Measurement report: Number size distribution of sub-40&thinsp;nm particles in the Amazon rainforest

Zhu, Jianqiang; Li, Guo; Kuhn, Uwe; Meller, Bruno Backes; Pöhlker, Christopher; Artaxo, Paulo; Pöschl, Ulrich; Cheng, Yafang; Su, Hang

doi:10.5194/acp-25-17667-2025

Articles | Volume 25, issue 23

https://doi.org/10.5194/acp-25-17667-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-25-17667-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 25, issue 23

Measurement report

|

05 Dec 2025

Measurement report |

| 05 Dec 2025

Measurement report: Number size distribution of sub-40 nm particles in the Amazon rainforest

Jianqiang Zhu, Guo Li, Uwe Kuhn, Bruno Backes Meller, Christopher Pöhlker, Paulo Artaxo, Ulrich Pöschl, Yafang Cheng, and Hang Su

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Total article views: 4,170 (including HTML, PDF, and XML)

HTML	PDF	XML	Total	Supplement	BibTeX	EndNote
3,280	738	152	4,170	299	163	210

HTML: 3,280
PDF: 738
XML: 152
Total: 4,170
Supplement: 299
BibTeX: 163
EndNote: 210

Views and downloads (calculated since 28 Feb 2025)

Month	HTML	PDF	XML	Total
Feb 2025	34	0	34
Mar 2025	170	50	12	232
Apr 2025	114	40	10	164
May 2025	60	34	2	96
Jun 2025	60	24	4	88
Jul 2025	42	18	0	60
Aug 2025	278	20	4	302
Sep 2025	1,132	22	12	1,166
Oct 2025	62	12	2	76
Nov 2025	96	22	10	128
Dec 2025	417	165	30	612
Jan 2026	227	79	13	319
Feb 2026	192	79	17	288
Mar 2026	187	97	20	304
Apr 2026	160	70	13	243
May 2026	49	6	3	58

Cumulative views and downloads (calculated since 28 Feb 2025)

Month	HTML	PDF	XML	Total
Feb 2025	34	0	34
Mar 2025	170	50	12	232
Apr 2025	114	40	10	164
May 2025	60	34	2	96
Jun 2025	60	24	4	88
Jul 2025	42	18	0	60
Aug 2025	278	20	4	302
Sep 2025	1,132	22	12	1,166
Oct 2025	62	12	2	76
Nov 2025	96	22	10	128
Dec 2025	417	165	30	612
Jan 2026	227	79	13	319
Feb 2026	192	79	17	288
Mar 2026	187	97	20	304
Apr 2026	160	70	13	243
May 2026	49	6	3	58

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Total article views: 4,170 (including HTML, PDF, and XML) Thereof 4,170 with geography defined and 0 with unknown origin.

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Short summary

The manuscript reports unique measurements of sub-40 nm particles and ions, especially those smaller than 10 nm, in the Amazon from December 2022 to January 2023. A large number of sub-3 nm particles and naturally charged ions were present in the Amazonia boundary layer, and they showed a clear diurnal variation. The research will contribute to a better understanding of atmospheric processes in the pristine environment.