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Home > EN > Job Opportunities > PhD 2017

SPECTRO — Chemical and structural characterization of natural and anthropogenic aerosols

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PhD Director: Cristian Focsa & Bertrand Chazallon.

Ice crystals nucleation in the atmosphere has an important impact on the radiative transfer and the clouds properties. Among the various aerosols which can serve as ice condensation nuclei (mineral dust, soot, bio-aerosols etc.), the biogenic and anthropogenic aerosols can have a significant influence on the climate, by changing the properties and the life cycle of ice and mixed clouds at global scale. In the low troposphere, the increase of soot particles number may lead to an increased solidification of supercooled water droplets in the clouds and to the increase of solid precipitations. The same stands for the biogenic aerosols, as the capacity of ice nucleation on primary biological particles (bacteria, pollens, spores …) has been detected over the last 40 years.

In order to systematically study the ice nucleation capacity of the aerosols, a most complete characterization (in terms of morphology, structure, chemical composition) is needed. This PhD thesis takes profit of state-of-the-art experimental capacities of the PhLAM laboratory (new high-resolution mass spectrometer to be delivered in spring 2017, Raman and FTIR spectrometers) in order to undertake an extensive study on the chemical and structural properties of soot aerosols (from various sources: laboratory, automobile, aeronautical) and of biogenic aerosols (pollens). These works are done in the frame of regional and national projects (CPER CLIMIBIO, Labex CaPPA, ANR project submitted), but also in the frame of the H2020 European project PEMS4Nano. They will have a dominant experimental character. The candidate must have a solid background in physics and chemistry and a strong interest for experimental work.