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Amazon River wind revealed by air pollution observation


Figure 1. Conceptual diagram of heat-driven recirculation of river winds and their potential impact on the dispersion of urban pollution in river urban and forest landscapes.Credit: University of Wageningen

River winds are caused by the daily thermal contrast between the land and the river. During the day, when the land temperature rises, the air mass becomes lighter and lifted. The air mass then propels the movement of air on land from the river to the land. After that, the air sinks over the river. The result is a closed local air circulation cell on a vertical plane (Figure 1). At night, the land cools more rapidly and the rivers warm up, reversing the air circulation. These propulsions combine with trade winds and large and small atmospheric flows in the region’s terrain, so the combined river winds remain elusive and difficult to understand, measure, and simulate. Next, an important question arises. How can we obtain accurate observational evidence of the wind circulation in these rivers?

How traditional meteorology and pollution measurement platforms cannot measure Wind, Temperature, moisture and air pollutants vary depending on the height above the river. Therefore, a medium-sized unmanned aerial vehicle (UAV-see photo) was used.They have potential progress Atmospheric research Due to the extreme maneuverability when collecting data at high horizontal and vertical resolutions. A UAV with sensors was used to collect vertical information on the meteorological and chemical data of the daytime lower atmosphere of the Rio Negro River in central Amazon on the fly. The impact of atmospheric recirculation associated with river breeze on the air quality of nearby populations was considered.

Modeling component

To support the interpretation of these observations, the study includes modeling components that combine fine modeling analysis with large eddy simulation (LES) with field observations of river winds and chemistry. This model was developed by the Meteorology and Air Quality Group at Wageningen University & Research. It is also an important component of the Luis Dahl Observatory.

The LES simulation investigated the effect of river winds on the dispersion of air pollution. The LES simulation explicitly reproduces the wind turbulence and atmospheric circulation of the Amazon River. The simulation captured the main characteristics of the river wind observed by UAV sensing.

This study shows the need to combine measurement (drone) and high-detail modeling (LES) methodologies. The implication of this study is that the recirculation of air caused by river winds slows the spread of air pollution.It also changes Spatial distribution It can increase the chemistry of air pollutants and the risk of human exposure to air pollution in riverbank areas. The findings emphasize the need to understand the impact of river winds on air pollution.Amazon’s air pollution control strategies and policies emphasize that the effects of river winds should be incorporated to be effective. pollution Relaxation and control. Further research is being done in the NWO project Cloudroots..


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Quote: The wind of the Amazon river revealed by air pollution observation (October 4, 2021) is from https://phys.org/news/2021-10-amazonian-river-unraveled-air-pollution.html 2021 Obtained on October 4, 2014

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Amazon River wind revealed by air pollution observation

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