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: 2,696 (including HTML, PDF, and XML)

HTML	PDF	XML	Total	Supplement	BibTeX	EndNote
1,934	652	110	2,696	246	116	135

HTML: 1,934
PDF: 652
XML: 110
Total: 2,696
Supplement: 246
BibTeX: 116
EndNote: 135

Views and downloads (calculated since 28 Feb 2025)

Month	HTML	PDF	XML	Total
Feb 2025	17	0	17
Mar 2025	72	22	6	100
Apr 2025	57	20	5	82
May 2025	25	17	1	43
Jun 2025	33	12	2	47
Jul 2025	21	9	0	30
Aug 2025	108	10	2	120
Sep 2025	423	6	2	431
Oct 2025	31	6	1	38
Nov 2025	46	11	5	62
Dec 2025	392	197	23	612
Jan 2026	211	82	13	306
Feb 2026	166	81	17	264
Mar 2026	155	92	18	265
Apr 2026	171	87	14	272
May 2026	6	1	7

Cumulative views and downloads (calculated since 28 Feb 2025)

Month	HTML	PDF	XML	Total
Feb 2025	17	0	17
Mar 2025	72	22	6	100
Apr 2025	57	20	5	82
May 2025	25	17	1	43
Jun 2025	33	12	2	47
Jul 2025	21	9	0	30
Aug 2025	108	10	2	120
Sep 2025	423	6	2	431
Oct 2025	31	6	1	38
Nov 2025	46	11	5	62
Dec 2025	392	197	23	612
Jan 2026	211	82	13	306
Feb 2026	166	81	17	264
Mar 2026	155	92	18	265
Apr 2026	171	87	14	272
May 2026	6	1	7

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Total article views: 2,696 (including HTML, PDF, and XML) Thereof 2,696 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.