River winds and pollutant recirculation near the Manaus city in the central Amazon

Tianning Zhao; Jianhuai Ye; Igor O. Ribeiro; Yongjing Ma; Hui-Ming Hung; Carla E. Batista; Matthew P. Stewart; Patricia C. Guimarães; Jordi Vilà-Guerau De Arellano; Rodrigo A.F. De Souza; Alex B. Guenther; Scot T. Martin

doi:10.1038/s43247-021-00277-6

River winds and pollutant recirculation near the Manaus city in the central Amazon

Tianning Zhao, Jianhuai Ye, Igor O. Ribeiro, Yongjing Ma, Hui-Ming Hung, Carla E. Batista, Matthew P. Stewart, Patricia C. Guimarães, Jordi Vilà-Guerau De Arellano, Rodrigo A.F. De Souza, Alex B. Guenther, Scot T. Martin^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

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Abstract

Local atmospheric recirculation flows (i.e., river winds) induced by thermal contrast between wide Amazon rivers and adjacent forests could affect pollutant dispersion, but observational platforms for investigating this possibility have been lacking. Here we collected daytime vertical profiles of meteorological variables and chemical concentrations up to 500 m with a copter-type unmanned aerial vehicle during the 2019 dry season. Cluster analysis showed that a river-forest recirculation flow occurred for 23% (13 of 56) of the profiles. In fair weather, the thermally driven river winds fully developed for synoptic wind speeds below 4 m s−1, and during these periods the vertical profiles of carbon monoxide and total oxidants (defined as ozone and nitrogen dioxide) were altered. Numerical modeling shows that the river winds can recirculate pollution back toward the riverbank. There are implications regarding air quality for the many human settlements along the rivers throughout northern Brazil.

Original language	English
Article number	205
Journal	Communications Earth & Environment
Volume	2
Issue number	1
DOIs	https://doi.org/10.1038/s43247-021-00277-6
Publication status	Published - 1 Oct 2021

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Zhao, T., Ye, J., Ribeiro, I. O., Ma, Y., Hung, H.-M., Batista, C. E., Stewart, M. P., Guimarães, P. C., Vilà-Guerau De Arellano, J., De Souza, R. A. F., Guenther, A. B., & Martin, S. T. (2021). River winds and pollutant recirculation near the Manaus city in the central Amazon. Communications Earth & Environment, 2(1), Article 205. https://doi.org/10.1038/s43247-021-00277-6

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title = "River winds and pollutant recirculation near the Manaus city in the central Amazon",

abstract = "Local atmospheric recirculation flows (i.e., river winds) induced by thermal contrast between wide Amazon rivers and adjacent forests could affect pollutant dispersion, but observational platforms for investigating this possibility have been lacking. Here we collected daytime vertical profiles of meteorological variables and chemical concentrations up to 500 m with a copter-type unmanned aerial vehicle during the 2019 dry season. Cluster analysis showed that a river-forest recirculation flow occurred for 23% (13 of 56) of the profiles. In fair weather, the thermally driven river winds fully developed for synoptic wind speeds below 4 m s−1, and during these periods the vertical profiles of carbon monoxide and total oxidants (defined as ozone and nitrogen dioxide) were altered. Numerical modeling shows that the river winds can recirculate pollution back toward the riverbank. There are implications regarding air quality for the many human settlements along the rivers throughout northern Brazil.",

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AU - Zhao, Tianning

AU - Ye, Jianhuai

AU - Ribeiro, Igor O.

AU - Ma, Yongjing

AU - Hung, Hui-Ming

AU - Batista, Carla E.

AU - Stewart, Matthew P.

AU - Guimarães, Patricia C.

AU - Vilà-Guerau De Arellano, Jordi

AU - De Souza, Rodrigo A.F.

AU - Guenther, Alex B.

AU - Martin, Scot T.

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AB - Local atmospheric recirculation flows (i.e., river winds) induced by thermal contrast between wide Amazon rivers and adjacent forests could affect pollutant dispersion, but observational platforms for investigating this possibility have been lacking. Here we collected daytime vertical profiles of meteorological variables and chemical concentrations up to 500 m with a copter-type unmanned aerial vehicle during the 2019 dry season. Cluster analysis showed that a river-forest recirculation flow occurred for 23% (13 of 56) of the profiles. In fair weather, the thermally driven river winds fully developed for synoptic wind speeds below 4 m s−1, and during these periods the vertical profiles of carbon monoxide and total oxidants (defined as ozone and nitrogen dioxide) were altered. Numerical modeling shows that the river winds can recirculate pollution back toward the riverbank. There are implications regarding air quality for the many human settlements along the rivers throughout northern Brazil.

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JO - Communications Earth & Environment

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River winds and pollutant recirculation near the Manaus city in the central Amazon

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