Estimation of nocturnal boundary layer height in the central Amazon, supported by gas concentration profiles

Souza, Carla M. A.; Mendonça, Anne C. S.; van Asperen, Hella; D'Oliveira, Flávio A. F.; Botía, Santiago; Martins, Luís G. N.; Hall, Denisi H.; Santana, Raoni A.; Fisch, Gilberto; Oliveira, Leonardo R.; Mata, Jailson R.; Figueiredo, Ranyelli; Albrecht, Rachel; Portela, Bruno T. T.; Quesada, Carlos A.; Dias-Júnior, Cléo Q.

doi:10.5194/acp-26-10679-2026

Articles | Volume 26, issue 14

https://doi.org/10.5194/acp-26-10679-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-26-10679-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 26, issue 14

Research article

|

30 Jul 2026

Research article |

| 30 Jul 2026

Estimation of nocturnal boundary layer height in the central Amazon, supported by gas concentration profiles

Carla M. A. Souza, Anne C. S. Mendonça, Hella van Asperen, Flávio A. F. D'Oliveira, Santiago Botía, Luís G. N. Martins, Denisi H. Hall, Raoni A. Santana, Gilberto Fisch, Leonardo R. Oliveira, Jailson R. Mata, Ranyelli Figueiredo, Rachel Albrecht, Bruno T. T. Portela, Carlos A. Quesada, and Cléo Q. Dias-Júnior

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Jan 2026	759	296	89	1,144
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Mar 2026	319	385	26	730
Apr 2026	56	65	2	123
May 2026	33	41	3	77
Jun 2026	17	6	1	24
Jul 2026	6	11	2	19

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Short summary

We investigated how the height of the nocturnal air layer (h_n) above the Amazon forest changes over the year and how this influences gas measurements. Using two years of tower observations, we found that this layer is higher during wetter periods and much lower during dry periods linked to large climate events. h_n can controls how gases accumulate or disperse at night, which affects how we interpret observations and improve weather and climate predictions.


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