New Publication: biodiversity of microorganisms within aerosols of the Amazon rainforest

It is well established that aerosols are relevant for the climate, for example, because they contribute to cloud formation. However, natural, biological aerosols emitted by plants serve another important purpose. They help disperse living microorganisms across the globe, affecting their distribution. Yet little is known about those bioaerosols emitted by …

New Publication: Inertial Sublayer over the Amazon Rainforest?

The Amazon rainforest interacts with the atmosphere by exchanging many substances. Many of these, such as carbon dioxide, methane, ozone, and organic compounds, are produced by the vegetation. They are very influential in both the regional and global climates. Until now, the estimates of their emission and absorption rates are …

New Publication: rainforest VOC emissions change in El Nino years

Science is a lot like life: Things don’t always turn out the way you thought they would. Recently, Eva Pfannerstill and her team wanted to find out how Amazonian plants react to ecological stresses, such as heat and drought. They wondered if they release more VOCs in such a situation. To do that, …

New Publication: Comparing air pollution in Manaus and at ATTO by identifying aerosols

You have probably heard a lot about air pollution recently, comparing air pollution in Manaus and in the Amazon rainforest by analyzing what aerosols are present. Edited after Wu et al. (2018)be it because of the massive wildfires in California, smog in India or the diesel emission scandal in Germany. So let’s look into air pollution in the Amazon. Most air pollutants are actually aerosols. Identifying these aerosols and their chemical composition can help us understand where they come from and to what extent certain regions are affected by air pollutions. That is exactly what Li Wu and co-authors did in their new study in the Amazon rainforest.

They collected and analyzed aerosols in two locations: the city of Manaus, a large urban area in Brazil, and the ATTO site in the heart of the forest. The samples were collected during the wet season when ATTO is mainly influenced by air masses from the Atlantic and is located upwind from Manaus. And indeed they found that at ATTO the aerosols are mostly of organic origin, emitted by the forest itself. Additionally, they could identify mineral dust and sea-salt particles. In contrast, they frequently found soot, fly ash and particles containing heavy metals in the samples in Manaus. These are most likely produced by human activities. The good news is that such anthropogenic particles are still largely absent from the atmosphere over the rainforest, showing us that pristine wilderness regions do still exist. That is, at least during the wet season when the winds blow in the “right” direction.

The scientists published the study in Atmospheric Chemistry and Physics (ACP) and is available Open Access here.

New Publication: Air turbulence characteristics in and above the Amazon rainforest canopy

One of our major goals at ATTO is understanding how the Amazon rainforest interacts with the atmosphere above. This includes studying how the characteristics of the air change within and above the tree canopy in terms of atmospheric turbulence. The strength of the wind and the thickness of the canopy …