Esdeveniments

The role of bioaerosol in Arctic atmosphere

26 Octubre 2018
(All day)
Ubicació: 
Sala d'Actes
Impartida per: 
Dr. Tina Santl-Temkiv
Filiació: 
Aarhus University, Dinamarca

Summary

Clouds are the least constrained Arctic atmospheric component that profoundly affects the regional radiative balance. Their optical properties, thickness and lifetime are tightly interlinked with the presence of atmospheric particles (aerosols). Aside from dust particles, airborne microorganisms, that are a fraction of biological aerosols (bioaerosols), have properties, which enable them to interact with the formation and development of clouds, rain, and snow. In particular, the qualitative and quantitative role of microorganisms carrying proteins specialized to nucleate cloud ice is heavily debated. During the past two decades, numerous studies in temperate regions have led to a theory that bioaerosols, such as bacteria, fungi, microalgae, and pollen, impact climate, as they can play a significant role in controlling the lifetime and extent of clouds. Field measurements in the Arctic demonstrated the presence of airborne biogenic ice-nucleating particles (bioINP). In addition, remote sensing of Arctic clouds confirmed the presence of cloud ice at temperatures, where only bioINP have the ability to trigger ice formation.

However, up to now, the importance of bioINP for atmospheric processes in the Arctic has merely been deduced from such episodical observations and misses a solid foundation based on dedicated field studies combining techinques within atmospheric science and microbiology. In this talk, I will review our recent attempts to quantitatively and qualitatively characterize the Arctic atmospheric bacterial communities that have recently been identified as potentially important actors in the Arctic atmospheric processes. I will show how a combination of low volume sampling, high-flow-rate sampling, next-generation sequencing and techniques, which are used within atmospheric science, can provide new insights into the properties and sources of airborne microorganisms.

 

Brief biography

Tina Šantl-Temkiv finished her PhD within the field of atmospheric microbiology in 2012 at the National Environmental Research Institute in Roskilde, Denmark. After her PhD, she worked as a postdoc at the Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University in Aarhus, Denmark. She spent one year as a postdoc at the Engineering Faculty, Lund University in Lund, Sweden. Since 2016, she has her own group as an assistant professor at the Department of Bioscience, Aarhus University in Aarhus, Denmark.