UFR de Physique

Propositions de stages en laboratoire -- M2

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Retrieval of aerosol above clouds properties using combined airborne sun-photometer and flux meter observations during the AEROCLO-SA field campaign in Namibia.

  • Option International « Atmospheric Environnement » du parcours Lumière-Matière
  • Laboratoire: Laboratoire d'Optique Atmosphérique (LOA )
  • Responsable du stage: WAQUET Fabien (fabien.waquet@univ-lille1.fr, 0320337014)
  • Co-responsable(s): Yevgeny Derimian, Luc Blarel, Gérard Brogniez
  • Mots clés: aerosols, clouds, radiation, flux, heating rates, aerosol absorption
  • Fiche complète en PDF : Fiche complète en PDF

The representation of aerosols, clouds and cloud-aerosol-radiation interaction remains one of the largest uncertainties in climate change. The South East Atlantic is a region where high atmospheric aerosol loadings with strong absorption properties can be transported above or within clouds. This area therefore provides a unique natural laboratory for studying aerosol-radiation and aerosol-cloud interactions. The AEROCLO-SA project is a field campaign focusing on the South East Atlantic off the western coast of Namibia (September 2016). This project is the French contribution of an international project, including partners from the UK and USA. During AEROCLO-SA, the LOA will deploy the airborne OSIRIS , a multi-viewing, multi-spectral, multi-polarization imager. Flux measurements will also be performed in the visible and in the thermal infrared. An airborne sun-photometer (PLASMA ) that measures the aerosol optical thickness and a lidar will be also onboard the aircraft. During the field campaign, vertical transects and spirals through the layers transported above clouds will be performed. The main goal of this subject is to estimate the optical and radiative properties of aerosols observed during the experiment as well the vertical distribution of these properties. In particular, the candidate will evaluate the PLASMA data by applying algorithms that allows retrieving the particles size distribution. Then, he/she will have to apply a method to account for the aircraft attitude to properly estimate the flux and the heating rates. The database will be used to validate available satellite and OSIRIS aerosol retrievals. The possibility of retrieving the aerosol absorption by comparing simulated and measured flux will be also evaluated.