Climate From Light Extinction and Scattering - Villeurbanne, France - Institut Lumière Matière

Description

CLIMATE FROM LIGHT EXTINCTION AND SCATTERING:

• Réf

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ABG-118610

• Stage master 2 / Ingénieur
• Durée 6 mois
• Salaire net mensuel 600 euros, financé par le CNES 01/12/2023
• Institut Lumière Matière
• Lieu de travail
• Villeurbanne Auvergne-RhôneAlpes France
• Champs scientifiques
• Physique
• Sciences de l'ingénieur
• Mots clés laser ; nanoparticles ; scattering ; nonlinear optics ; spectroscopy ; polarimetry 15/12/2023
  Établissement recruteur:
  Site web:

L'ILM est une unité mixte de recherche entre l'Université de Lyon (UCBL) et le Centre National de la Recherche Scientifique (CNRS) qui comprend environ 300 personnes répartis entre chercheurs, enseignants-chercheurs, personnels de support à la recherche, doctorants et post-doctorant.

L'ILM est composé de 17 équipes de recherche organisés selon six axes thématiques, abordant divers sujets allant de la physique du solide et des nanosciences à l'optique ultra-rapide et à l'interaction matière-lumière.

L'iLM est localisé sur le Campus Lyon Tech La Doua à Villeurbanne.


Description:


SCIENTIFIC CONTEXT:
As underscored by the latest IPCC report (IPCC, 2021), atmospheric aerosols are nowadays recognized as the main
remaining uncertainty on the Earth's climate radiative budget.

This large uncertainty is to be related to the complexity of these particles, which present a wide range of sizes, shapes and chemical compositions.

This is especially true for mineral dust particles, which exhibit a very complex morphology, with highly irregular shapes, sometimes with sharp edges.

Whether such particles will cool or warm the Earth's climate is governed by the
albdedo affect, and hence by their ability to scatter light.
The state-of-the-art literature on light scattering and extinction is given by

Mishchenko et al However, no analytical solution of the Maxwell equations exists for particles presenting such a wide variety of sizes, shapes and chemical composition.

As a result, laboratory measurements are required to quantify the light interaction with atmospheric aerosols, in the aim to quantify their contribution to the Earth's radiative budget, which still needs to be revealed.

MISSIONS:
In this context, a groundbreaking laboratory experiment at iLM has been developed, aiming to quantify light scattering by complex aerosols in the specific backward scattering geometry of 180.0°, commonly used by climate satellites (Miffre et al., 2016, 2019, Using a Pi-polarimeter, this experiment reveals spectral and polarimetric signatures of aerosol populations, including their size, shape, and refractive index. The intern's primary task will be to calibrate the ability of these particles to backscatter light accurately. Additionally, the internship will involve exploring complementary methods of light interaction with these particles.


OUTLOOKS:
This internship opportunity can lead to a PhD thesis.


BIBLIOGRAPHY:
IPCC, Climate Change, The Physical Science Basis,
Mishchenko, M.I., and Travis, Light scattering by small particles, NY,
Miffre, A., T. Mehri, M. Francis and P. Rairoux, J. Quant. Spec. Rad. Transf., 169, 79-90,
Miffre, A., D. Cholleton, C. Noël and P. Rairoux, Atmos. Meas. Tech.,


Profil:

L'activité de recherche sera réalisée sous la supervision de Dr. Miffre du groupe de recherche ATMOS (chefs de groupe Prof. Rairoux et Dr. Ross).

Applicants should have a keen interest in optics, performing laboratory experiments, spectroscopy, or/and


Prise de fonction:

• 01/04/2024